Bug 1269 - boot hang unless "nolapic" -- ASUS M2400N
boot hang unless "nolapic" -- ASUS M2400N
Product: ACPI
Classification: Unclassified
Component: BIOS
i386 Linux
: P2 high
Assigned To: Len Brown
: 1026 1677 1682 1774 2044 2694 3002 3451 (view as bug list)
Depends on:
  Show dependency treegraph
Reported: 2003-09-25 02:17 UTC by Robert Vollmert
Modified: 2004-11-04 00:49 UTC (History)
13 users (show)

See Also:
Kernel Version: 2.6.0-test5, 2.4.22
Tree: Mainline
Regression: ---

DSDT that causes this problem (20.96 KB, application/x-gzip)
2003-09-25 02:20 UTC, Robert Vollmert
program to switch displays (3.17 KB, text/x-csrc)
2003-09-25 02:23 UTC, Robert Vollmert
/proc/ioports on 2.4.22 (1.10 KB, text/plain)
2003-09-26 01:29 UTC, Robert Vollmert
/proc/ioports on 2.6.0-test5 (754 bytes, text/plain)
2003-09-26 06:28 UTC, Robert Vollmert
dmesg of 2.6.0-test5 with APIC (5.05 KB, text/plain)
2003-09-30 05:53 UTC, Robert Vollmert
dmesg of 2.6.0-test5 without APIC (7.08 KB, text/plain)
2003-09-30 05:54 UTC, Robert Vollmert
a proposal patch for fixing this issue (1.18 KB, patch)
2003-10-29 07:34 UTC, Luming Yu
Details | Diff
2.4.25-rc1 with boot option acpi_pic_sci=edge (13.05 KB, text/plain)
2004-02-07 18:47 UTC, Sérgio M Basto
lspci -v (3.57 KB, text/plain)
2004-02-07 18:57 UTC, Sérgio M Basto
TM803 kernel config - works for me with APIC (26.64 KB, application/octet-stream)
2004-02-13 07:22 UTC, Carlos
timer patch for 2.6.3-rc2 (1.41 KB, text/plain)
2004-02-13 13:14 UTC, Alexander Holler
Patch to disable APIC timer on 2.6.3 (887 bytes, patch)
2004-02-19 20:10 UTC, James Clark
Details | Diff
dmidecode.txt (8.71 KB, text/plain)
2004-03-10 18:57 UTC, Alexander Holler
workaround for 2.4 (837 bytes, patch)
2004-05-17 22:39 UTC, Luming Yu
Details | Diff
2.6.6 disable_APIC_timer() debug patch (926 bytes, patch)
2004-06-10 01:04 UTC, Len Brown
Details | Diff
disable_APIC_timer() debug patch (2.4.26 or 2.6.6) (951 bytes, patch)
2004-06-10 12:20 UTC, Len Brown
Details | Diff
dmesg with apic on 2.4.26 (9.46 KB, text/plain)
2004-06-10 17:35 UTC, Sérgio M Basto
cat /proc/interrupts (527 bytes, text/plain)
2004-06-13 19:45 UTC, Sérgio M Basto
cat /proc/acpi/processor/CPU0/power (301 bytes, text/plain)
2004-06-13 19:46 UTC, Sérgio M Basto
2.6.7 test patch to enter ACPI mode before LAPIC init (5.45 KB, patch)
2004-08-12 11:07 UTC, Len Brown
Details | Diff
2.4.27 early-init patch (4.34 KB, patch)
2004-08-13 22:13 UTC, Len Brown
Details | Diff

Description Robert Vollmert 2003-09-25 02:17:19 UTC
Distribution: Debian unstable
Hardware Environment: ASUS M2400N Centrino notebook
Software Environment:
Problem Description: Hangs on boot when executing all _STA and _INI methods.
More exactly, with 'Local APIC' enabled, the computer hangs when executing
\_SB.PCI0.VGA._INI during boot-up, and also later when VGA-related methods
are called (after removing _INI from a custom DSDT to boot the system). There's
none of these problems when 'Local APIC' is disabled.

Linux 2.4.22 and 2.6.0-test5 appear to behave the same here (both with
ACPI 20030916).

The actual offending code in the DSDT appears to be a write to IO address 0xB2
by a method \ISMI (Issue SMI?). These calls are used to query and set the
active display devices (flat panel and/or external monitor).

The XFree86 driver for the integrated chipset, i855GM (the driver is i810)
has some code for switching display devices via 'int 10h', i.e. the video
BIOS. I have extracted this and made a small test program with LRMI
(http://sourceforge.net/projects/lrmi) and this can successfully set and read
the attached display state. This works both with or without 'Local APIC'
support (as does the X server).

So perhaps the BIOS makes the same calls to the video BIOS when told to by
the DSDT?

Steps to reproduce: Apply ACPI 20030916 patch (though I doubt this is necessary,
I haven't tested without), patch ACPI to circumvent bug #1260, and reboot.
Comment 1 Robert Vollmert 2003-09-25 02:20:27 UTC
Created attachment 932 [details]
DSDT that causes this problem

This is the original DSDT (minus cosmetic changes to make it compile) that
exhibits this problem. The offending code is \ISMI, called by various
VGA-related methhods (GCDD, GNDD, GCAD, SWH[GD], _INI).
Comment 2 Robert Vollmert 2003-09-25 02:23:32 UTC
Created attachment 933 [details]
program to switch displays

This is a hack of vbetest.c that's included with LRMI
(http://sourceforge.net/projects/lrmi) that talks to the video BIOS to query
the active display state and optionally set it. It works regardless of whether
'Local APIC' is enabled.
Comment 3 Shaohua 2003-09-25 19:23:21 UTC
can you attach '/proc/ioports' with local apic enabled and disabled?
Comment 4 Robert Vollmert 2003-09-26 01:29:23 UTC
Created attachment 938 [details]
/proc/ioports on 2.4.22

/proc/ioports turned out to be the same regardless of whether 'Local APIC' is

With the 'Local APIC' kernel (identical in configuration apart from this option
to the other kernel), I bypassed the boot problem by passing acpi=off to the
Comment 5 Robert Vollmert 2003-09-26 01:36:44 UTC
If I disable the vga console completely, I can boot successfully with ACPI and
Local APIC.
Comment 6 Shaohua 2003-09-26 01:49:55 UTC
>00a0-00bf : pic2
0xB2 is in the IO rang of pic2, I don't know if it's a problem. 
Comment 7 Luming Yu 2003-09-26 04:27:29 UTC
I have a question, Since there is a entry:
{ "pic2", 0xa0, 0xa1, IORESOURCE_BUSY } in standard_io_resources, the ioport 
range for pic2 should be 0xa0 - 0xa1. I don't understand why your box could 
have 0xa0 - 0xbf ? 

Comment 8 Luming Yu 2003-09-26 04:39:03 UTC
I also found below code in you dsdt:
                Device (PIC)
                    Name (_HID, EisaId ("PNP0000"))
                    Name (_CRS, ResourceTemplate ()
                        IO (Decode16, 0x0020, 0x0020, 0x00, 0x02)
                        IO (Decode16, 0x00A0, 0x00A0, 0x00, 0x02)
                        IRQNoFlags () {2}

Maybe we need to exploit this method to setup IO PORT resources for PIC1 and PIC2. 
Comment 9 Luming Yu 2003-09-26 04:58:45 UTC
I guess if you disable CONFIG_PM option, the kernel can work with ACPI, APIC and
VGA console enabled. 
Comment 10 Robert Vollmert 2003-09-26 05:35:04 UTC
Thanks for your efforts. I hope I'll be able to do some more testing tonight,
certainly tomorrow. Regarding the IORESOURCE_BUSY range, the /proc/ioports is
from Linux 2.4.22, which has 0xa0 to 0xbf there. However, the problem definitely
also exists with Linux 2.6.0-test5. I'll attach a copy of 2.6.0-/proc/ioports
Comment 11 Robert Vollmert 2003-09-26 06:28:01 UTC
Created attachment 939 [details]
/proc/ioports on 2.6.0-test5

this is on 2.6.0-test5 with ACPI, Local APIC, without Power Management, with
Comment 12 Robert Vollmert 2003-09-26 06:30:22 UTC
I've compiled 2.6.0-test5 with Local APIC, ACPI and vga console, but without
CONFIG_PM as suggested. It hangs in the same place, though.
Comment 13 Luming Yu 2003-09-27 03:45:28 UTC
From your comments , the problem looks interesting. Below is my understanding:
1) APIC + ACPI + VGA console = boot hang
2) ACPI + VGA console - APIC = ok
3) ACPI + APIC - VGA console = ok
4) APIC + VGA console - ACPI = ok

Did you try Serial console? Could you please catch dmesg from it. It can help 
me a lot. I also need your config file. thanks a lot.
Comment 14 Shaohua 2003-09-28 02:32:07 UTC
0xb2 is for power managment. In my machine (dell desktop), 
write 0x70 -> 0xb2 ioport, enable ACPI mode
write 0x71 -> 0xb2 ioport, disable ACPI mode
I don't know why your dsdt write the ioport frequently. VGA need special power 
Comment 15 Robert Vollmert 2003-09-30 05:49:29 UTC
First off, I unfortunately won't be able to work on this bug very well since I
handed the notebook off to its owner this weekend. I only prepared it for him
and got the chance to play with it a little. I'll post to the support list to
encourage some of the other M2N-owners to follow up on this.

Regarding the vga console: I found that it would boot without vga console on
2.4.22 and haven't been able to test it on 2.6.0-test5 as I didn't manage to
disable the configuration option.

Re comment #13: Unfortunately, the notebook doesn't have a serial port (and I
don't have an appropriate cable), so I couldn't test the serial console. I'll
attach the dmesg output of 2.6.0-test5 with and without APIC and the config file

Re comment #14: The DSDT writes to that IO port to query and set how the video
is routed from the video chip to the output ports: The chipset supports an
analog output, an internal flat panel and two digital outputs (my notebook only
has the first two). Also, it internally has two pipes, and these can be attached
to the output ports in different ways. E.g. analog (external CRT) and flat panel
both to pipe B to clone the display, or analog to pipe A and flat panel to pipe
B when you want to drive both monitors separately (e.g. for Xinerama). The DSDT
switches this mapping, and queries what it will be after the next switch, by
writing to 0xb2.

Since this mapping can also be queried and changed by talking to the video BIOS
(for example, the program I've attached does this), I suspect that the BIOS
might do the same when told to by appropriate writes to port 0xb2. That's pretty
much speculation, though.
Comment 16 Robert Vollmert 2003-09-30 05:53:09 UTC
Created attachment 961 [details]
dmesg of 2.6.0-test5 with APIC

This is the output of dmesg on 2.6.0-test5 with APIC (and VGA console and
ACPI), where ACPI was disabled using acpi=off. Unfortunately, I failed to copy
the configuration -- it was rather minimal. I might be able to post it in a few
Comment 17 Robert Vollmert 2003-09-30 05:54:33 UTC
Created attachment 962 [details]
dmesg of 2.6.0-test5 without APIC

This is 2.6.0-test5 without local APIC support, but with ACPI and VGA console.
The only difference from the config of the previous attachment is that I
removed 'Local APIC', and I booted without parameters (i.e. no acpi=off).
Comment 18 Luming Yu 2003-10-29 07:34:28 UTC
Created attachment 1257 [details]
a proposal patch for fixing this issue

Kernel hang when writing 0x95 to port 0xB2. If disable APIC , such kind of
opertation will not hang. It looks like APIC local timer cause the problem.
At least below code in __setup_APIC_LVTT seems to be write reserved bits of LVT
Timer Register.
      lvtt1_value = SET_APIC_TIMER_BASE(APIC_TIMER_BASE_DIV) |	//which access 

Comment 19 Len Brown 2004-01-22 10:50:57 UTC
*** Bug 1774 has been marked as a duplicate of this bug. ***
Comment 20 Len Brown 2004-01-22 10:54:13 UTC
*** Bug 1677 has been marked as a duplicate of this bug. ***
Comment 21 Sérgio M Basto 2004-01-23 10:54:21 UTC
well after 2 years e 4 days:: _after_ buy my laptop , APIC works with ACPI ! 
or seem to work 
for me its a great new.

using kernel-2.4.25-pre6 + 
cpufreq-LINUX_2_4-20040123.tar.bz2 + 

however cat /proc/interrupts still XT-PIC
#cat /proc/interrupts
  0:      61973          XT-PIC  timer
  1:        739          XT-PIC  keyboard
  2:          0          XT-PIC  cascade
  8:          1          XT-PIC  rtc
  9:        615          XT-PIC  usb-uhci
 10:          2          XT-PIC  acpi
 12:      13064          XT-PIC  PS/2 Mouse
 14:      13012          XT-PIC  ide0
 15:       7846          XT-PIC  ide1
NMI:          0
LOC:      61462
ERR:         36
MIS:          0

  5:        882          XT-PIC  VIA686A
has disapear disappear ???
Comment 22 Len Brown 2004-01-23 11:29:42 UTC
*** Bug 1026 has been marked as a duplicate of this bug. ***
Comment 23 Sérgio M Basto 2004-01-31 10:15:53 UTC
After several days of tests I found 2 problems in this proposal patch :
1- Won't compile if we don't enable APIC in kernel configuration
drivers/acpi/acpi.o: In function `acpi_bus_init':
drivers/acpi/acpi.o(.text.init+0xa4f): undefined reference to `disable_APIC_timer'
drivers/acpi/acpi.o(.text.init+0xb05): undefined reference to `enable_APIC_timer'
drivers/acpi/acpi.o(.text.init+0xc14): undefined reference to `enable_APIC_timer'

2- Pressing Fn+F3  hangs computer instead print:
[ACPI Debug] String: ==== Fn+F3 hot key handler ====
[ACPI Debug] String: Change between LCD, CRT, or both LCD and CRT displays
[ACPI Debug] String: --------- VIA SOFTWARE SMI PMIO 2Fh ------------

Anyway, one workaround disable APIC, if we have it enabled, but at least won't
hang on boot, this problem affect many computers at least all series of compaq
presario 7xx
denoted by APIC victims
Comment 24 Georg Greve 2004-02-05 04:55:11 UTC
I just tried 2.6.2 and 2.6.2-mm1 both with ACPI & APIC enabled and
the problem seems to have reappeared, as the machine hangs during boot

 "ACPI: IRQ9 SCI: Edge set to Level Trigger

I can boot with "acpi=off" or I can compile the kernel without APIC
and then things seem fine.

This is on an ASUS M2N, for more information about it, please see

It seems there is still something fishy in ACPI & APIC interaction.

(Also see http://bugzilla.kernel.org/show_bug.cgi?id=1890)
Comment 25 Gonzalo Fern 2004-02-05 05:14:54 UTC
I can confirm that Compaq Presario 2540ea, with linux-2.6.2 with "lapic" on 
comand line does NOT boot, while without "lapic", it boots OK.

BTW, second part of the patch (the part against drivers/acpi/bus.c) seems not 
to be included in patch-2.6.2

Comment 26 Shaohua 2004-02-05 17:33:04 UTC
second part of the patch is a workaround.
can acpi_pic_sci=edge help?
Comment 27 Sérgio M Basto 2004-02-05 20:09:58 UTC
My experience says that this problem happens in all version of 2.4.x and 2.6.x.

so I test mainly with 2.4 and 

all the patch seems not to be included in patch-2.4.25-rc1
Comment 28 Sérgio M Basto 2004-02-07 18:39:00 UTC
kernel-2.4.25-rc1 + 
cpufreq-LINUX_2_4-20040207.tar.bz2 + 
http://bugzilla.kernel.org/attachment.cgi?id=1257&action=view +
last acpi patch 

Re:#26 boot with acpi_pic_sci=edge
Disable all acpi events, that prevents laptop hangs when we press fn+F3, because
event isn't generate.

fn-F7 (- bright) and fn-F8 (+bright) works normally 

Other note: I upgrade my system and now I use FC1 and compile vanilla kernel
with gcc3.2 like is recommended by fedora team.
(just swap gcc with gcc32 in Makefile)
and the beaver of laptop is exactly the same !  
Comment 29 Sérgio M Basto 2004-02-07 18:47:29 UTC
Created attachment 2059 [details]
2.4.25-rc1 with boot option acpi_pic_sci=edge

the result from normal boot is :
-ACPI: IRQ10 SCI: Edge set to Level Trigger.
+ACPI: IRQ10 SCI: Edge Trigger.
Comment 30 Sérgio M Basto 2004-02-07 18:57:26 UTC
Created attachment 2060 [details]
lspci -v
Comment 31 Gonzalo Fern 2004-02-09 01:46:05 UTC
>second part of the patch is a workaround.
>can acpi_pic_sci=edge help?

On Compaq Presario 2540EA, using plain 2.6.2, with "lapic acpi_pic_sci=edge" on 
command line, don't boot. Plain 2.6.2 and plain 2.6.2 with "acpi_pic_sci=edge" 
on command line, both boots but without LAPIC
Comment 32 James Clark 2004-02-13 00:11:03 UTC
On an Acer TravelMate 803LMi (4A14 BIOS), a vanilla 2.6.2 kernel with  UP_APIC
*sometimes* hangs on boot immediately after printing

ACPI: IRQ9 SCI: Edge set to Level Trigger

It seems to be unpredictable whether it will hang or not, except that if I
completely remove power first (both unplug AC power and remove battery) it
always seems to boot OK.  The DSDT is in the acpi.sourceforge.net collection.

I've switched to a kernel without APIC and so far it hasn't hung on boot.

Unfortunately this machine doesn't have a serial port, which limits the
opportunities for kernel debugging. (I'm trying to get hold of a port extender
with a serial port.)
Comment 33 Carlos 2004-02-13 07:21:21 UTC
James: I have exactly the same Notebook, and had the same problem, with
2.6.3-rc2-mm1 and earlier kernels. The error disappears for me and I can use
APIC when I enable "HPET" and "Power Management Timer Support" in the kernel. I
have no idea if that makes sense. I'll attach my .config for you, so you can try.
Comment 34 Carlos 2004-02-13 07:22:51 UTC
Created attachment 2107 [details]
TM803 kernel config - works for me with APIC
Comment 35 Luming Yu 2004-02-13 08:24:53 UTC
I'm curious whether the patch of disabling local apic timer can work for your 
Acer TravelMate 803LMi ? 
Comment 36 Alexander Holler 2004-02-13 13:14:02 UTC
Created attachment 2108 [details]
timer patch for 2.6.3-rc2

Disabling the timer with the patch from Karol Kozimor helps on my Acer 803lmi
(with 2.6.3-rc2).
Comment 37 James Clark 2004-02-14 11:43:40 UTC
As far as I can tell, the TM803 doesn't have an HPET (at least acpidmp doesn't
show an HPET table), so I think it is only the "Power Management Timer Support"
option that is making the difference.  This is in the mm kernels but isn't in
the vanilla 2.6.2 kernel, so to test this I applied


to a vanilla 2.6.2 kernel. So far, with this patch, and enabling both
X86_PM_TIMER and X86_UP_APIC I haven't yet had a hang on boot.
Comment 38 James Clark 2004-02-19 20:08:23 UTC
I just upgraded from 2.6.2 to 2.6.3 and this bug has got worse.  Enabling
X86_PM_TIMER no longer prevents the problem.  Also instead of hanging on boot
only sometimes, it now hangs every time.  However, disabling the APIC timer in
bus.c is still an effective workaround. 
Comment 39 James Clark 2004-02-19 20:10:26 UTC
Created attachment 2193 [details]
Patch to disable APIC timer on 2.6.3
Comment 40 Len Brown 2004-03-10 18:08:02 UTC
> Found and enabled local APIC!

Either we need to change this default action, or we need
to blacklist his platform (and others like it) to run "nolapic".

please attach the output from dmidecode.

Comment 41 Alexander Holler 2004-03-10 18:56:02 UTC
Attached is the output from dmidecode on my acer travelmate 803lmi. 
Comment 42 Alexander Holler 2004-03-10 18:57:05 UTC
Created attachment 2313 [details]
Comment 43 Stephan Sürken 2004-03-13 14:50:39 UTC
FYE: I just updated to the new BIOS (its not yet officially announced, it seems)
on my M2400N, and (2.6.4, that is, haven't tried others) booted without
disabling local apic.


See also #1963.
Comment 44 Georg Greve 2004-03-14 07:36:33 UTC
I can confirm that with 2.6.3 after BIOS upgrade. 

But I'm now seeing a lot of

 codec_semaphore: semaphore is not ready [0x1][0x700300]

lines during ALSA init.

They don't seem to do much harm, though - sound is working fine.
Comment 45 Alexander Holler 2004-03-14 11:32:04 UTC
On the Acer Travelmate 803lmi it seems to be fixed with Bios 4a17 and/or Linux 
I could boot 2.6.4 with Bios 4a13 and 4a17 and I can boot 2.6.3 with 4a17. I 
haven't retried the old comination 2.6.3 with 4a13 which hade made problems. 
Comment 46 Alexander Holler 2004-03-14 11:34:37 UTC
sorry, s/4a13/4a14/ 
Comment 47 Len Brown 2004-05-12 21:00:31 UTC
*** Bug 2044 has been marked as a duplicate of this bug. ***
Comment 48 Len Brown 2004-05-12 22:16:18 UTC
*** Bug 1682 has been marked as a duplicate of this bug. ***
Comment 49 Len Brown 2004-05-17 21:37:39 UTC
*** Bug 2694 has been marked as a duplicate of this bug. ***
Comment 50 Luming Yu 2004-05-17 22:35:20 UTC
As far as I know, this is an obvious BIOS bug. If you really want try APIC 
timer with ACPI, please try workaround patch above.

Comment 51 Luming Yu 2004-05-17 22:39:50 UTC
Created attachment 2891 [details]
workaround for 2.4

the real fix should be in BIOS.
Comment 52 Len Brown 2004-06-09 23:47:50 UTC
There are too many systems with this failure. 
We need a Linux fix -- even if it turns out to effectively be a BIOS workaround. 
Comment 53 Len Brown 2004-06-10 01:04:54 UTC
Created attachment 3126 [details]
2.6.6 disable_APIC_timer() debug patch

If your system hangs on boot w/o "nolapic"
and the earlier disable_APIC_timer() patch allowed you to use the LAPIC,
then please try this debug version of the disable_APIC_timer() patch
and see if it behaves any differently.

The intent is to confirm the notion that the hang happens when we
write to the SMI_CMD register to enable ACPI, and that if the LAPIC
timer is disabled at that point, then the hang does not occur.
Comment 54 Sérgio M Basto 2004-06-10 06:18:23 UTC
I agree totally to many computers with this.
RE: Can I try this on kernel 2.4.26 ?

I got this errors on 2.4.26:
In file included from hwacpi.c:47:
/usr/src/linux-2.4.26s/include/asm/apic.h: In function `apic_write':
/usr/src/linux-2.4.26s/include/asm/apic.h:25: warning: implicit declaration of
function `fix_to_virt'
/usr/src/linux-2.4.26s/include/asm/apic.h:25: `FIX_APIC_BASE' undeclared (first
use in this function)
/usr/src/linux-2.4.26s/include/asm/apic.h:25: (Each undeclared identifier is
reported only once
/usr/src/linux-2.4.26s/include/asm/apic.h:25: for each function it appears in.)
/usr/src/linux-2.4.26s/include/asm/apic.h: In function `apic_write_atomic':
/usr/src/linux-2.4.26s/include/asm/apic.h:30: `FIX_APIC_BASE' undeclared (first
use in this function)
/usr/src/linux-2.4.26s/include/asm/apic.h: In function `apic_read':
/usr/src/linux-2.4.26s/include/asm/apic.h:35: `FIX_APIC_BASE' undeclared (first
use in this function)
make[4]: *** [hwacpi.o] Error 1
Comment 55 Len Brown 2004-06-10 12:20:10 UTC
Created attachment 3139 [details]
disable_APIC_timer() debug patch (2.4.26 or 2.6.6)

sure, this version of the debug patch applies cleanly
to either 2.4.26 or 2.6.6.
Comment 56 Sérgio M Basto 2004-06-10 17:35:01 UTC
Created attachment 3141 [details]
dmesg with apic on 2.4.26

ok boots with apic, but still XT-PIC interruptss, even cleaning via quirks from
drivers/pci, still hangs when press fn+F3 (tv-out).
Comment 57 Len Brown 2004-06-11 22:50:33 UTC
Comment 58 Sérgio M Basto 2004-06-13 19:42:49 UTC
thanks, for this mini lesson, I really didn't knew the difference of local APIC
and IO-APIC, and yes I don't have MADT, so I just have one local APIC, for sure
the kernel is built with IOAPIC and lapic and yes /proc/interrupts show LOC

yes this COMPAQ has been some fun in past and have several workarounds in kernel
one on file arch/i386/kernel/pci-pc.c, is:
Disabling VIA memory write queue (PCI ID 0305, rev 80): [55] 3c & 1f -> 1c, 
I don't know what this done, but appears this comment:
/* Addresses issues with problems in the memory write queue timer in 
* certain VIA Northbridges.  This bugfix is per VIA's specifications, 
* except for the KL133/KM133: clearing bit 5 on those Northbridges seems 
* to trigger a bug in its integrated ProSavage video card, which 
* causes screen corruption.  We only clear bits 6 and 7 for that chipset, 
* until VIA can provide us with definitive information on why screen 
* corruption occurs, and what exactly those bits do. 
* VIA 8363,8622,8361 Northbridges: 
*  - bits  5, 6, 7 at offset 0x55 need to be turned off * VIA 8367 (KT266x)
*  - bits  5, 6, 7 at offset 0x95 need to be turned off * VIA 8363 rev 0x81/0x84
(KL133/KM133) Northbridges: 
*  - bits     6, 7 at offset 0x55 need to be turned off */

in my case is exactly KL133/KM133 Northbridges with ProSavage video card.

The bios system is the latest from compaq and is dated of 2002-07-15.
ACPI SCI works on any event as usual, except fn+F3 (tvout) has I write in my
last message of this bug and also increments acpi entry.

This was reported on this weekend testing, with 48 hours of up-time 
and comment the lines 771 to 778 of linux-2.4.26s/drivers/pci/quirks.c
quirk_via_ioapic }, */
quirk_via_acpi }, */
quirk_via_acpi }, */
quirk_via_irqpic }, */
quirk_via_irqpic }, */
quirk_via_irqpic }, */

I don't see much difference, comment or not comment this lines, on behavior of
the laptop, but I know that will be applied on my laptop if I uncomment.
Comment 59 Sérgio M Basto 2004-06-13 19:45:14 UTC
Created attachment 3154 [details]
cat /proc/interrupts
Comment 60 Sérgio M Basto 2004-06-13 19:46:36 UTC
Created attachment 3155 [details]
cat /proc/acpi/processor/CPU0/power
Comment 61 Robert 2004-07-19 06:43:50 UTC
I'm running 2.6.7 on an acer travelmate 800lci, and am experiencing some form of
this bug as well (boot hangs with "ACPI: IRQ9 SCI: Edge set to Level Trigger")
with acpi, lapic and io-apic.

The problem got a lot worse with the latest acpi patch (acpi-20040715-2.6.7), to
the point that I couldn't boot the machine anymore (it would hang everytime).

For me the workaround patch at
http://marc.theaimsgroup.com/?l=linux-kernel&m=107477355619716&w=2 worked
perfectly. The first part of this patch is already included in the acpi patch,
the second part is the same as in comment #39. It works great now with acpi and
Comment 62 Len Brown 2004-08-12 11:07:29 UTC
Created attachment 3495 [details]
2.6.7 test patch to enter ACPI mode before LAPIC init

This patch enables ACPI mode earlier, hopefully avoiding this issue altogether.
Please give it a test.
Comment 63 Len Brown 2004-08-13 22:13:01 UTC
Created attachment 3509 [details]
2.4.27 early-init patch

2.4 version of 2.6 patch above
Comment 64 Sérgio M Basto 2004-08-31 17:47:58 UTC
2.4.27 early-init patch, seems to work on my laptop, if no colateral problems, I
think that should be applied.

Comment 65 Sérgio M Basto 2004-09-02 11:21:55 UTC
I forgot to test !

Fn+F2 (switch to external CRT) crashes kernel.

so maybe it is not good idea apply patch, yet.
Comment 66 Sérgio M Basto 2004-10-12 17:15:53 UTC
with allow "lapic" to force enable LAPIC patch

just resolve my problem and is already included on kernel 2.6.9-rc4

btw: I realize when I had LAPIC enabled 
I got this message:
spurious 8259A interrupt: IRQ7.
that can be the root of the lapic problem.

If I may suggest and if we don't have regretions, this patch should also enter
in kernel-2.4.28

big thanks,
Comment 67 Len Brown 2004-11-03 15:19:51 UTC
shipped in 2.6.9 and also in 2.4.28 -- closing.
Comment 68 Len Brown 2004-11-03 23:30:29 UTC
*** Bug 3002 has been marked as a duplicate of this bug. ***
Comment 69 Len Brown 2004-11-04 00:49:38 UTC
*** Bug 3451 has been marked as a duplicate of this bug. ***

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