Bug 1440
| Summary: | sound problems from incorrect IRQ routing - IOAPIC + LNK | ||
|---|---|---|---|
| Product: | ACPI | Reporter: | SungHyun Nam (namsh) |
| Component: | Config-Interrupts | Assignee: | Len Brown (lenb) |
| Status: | CLOSED CODE_FIX | ||
| Severity: | normal | CC: | acpi-bugzilla, adq_dvb, javibarroso |
| Priority: | P2 | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Kernel Version: | 2.4.23-pre[678] | Subsystem: | |
| Regression: | --- | Bisected commit-id: | |
| Attachments: |
cat /proc/interrupts using the kernel that has sound problem
alsa error message while trying to play sound outputs of acpidmp outputs of dmidecode outputs of dmesg /proc/interrupts using kernel which revert ChangeSet@1.1063..43.16 regression isolated to this patch patch to address the issue dmesg (kernel-BK + patch(id=1352) /proc/interrupts: kernel-BK + patch (id=1352) lspci -v output |
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Description
SungHyun Nam
2003-10-27 21:47:08 UTC
Created attachment 1225 [details]
cat /proc/interrupts using the kernel that has sound problem
Created attachment 1226 [details]
alsa error message while trying to play sound
Created attachment 1227 [details]
outputs of acpidmp
Created attachment 1228 [details]
outputs of dmidecode
Created attachment 1229 [details]
outputs of dmesg
Created attachment 1230 [details] /proc/interrupts using kernel which revert ChangeSet@1.1063..43.16 Created attachment 1314 [details] regression isolated to this patch The acpi_pci_link_allocate patch (attached) was integrated to address bug#1186. It would be a mistake to quickly revert it in the kernel, as those systems would immediately break. But it is a workaround for systems which we don't program properly. So it seems like a mistake to have it enabled by default, as it can negatively impact system which do not require the workaround, resulting IRQ routing may be non-optimal (bug #1391), or incorrect (this report). Probably we should enable the workaround on the failing systems manually via boot flag, or by black-list, rather than always. Created attachment 1352 [details]
patch to address the issue
Please test this patch -- run the sound, attach the dmesg and /proc/interrupts.
Thanks, -Len
Turns out that this systems is one of the rare birds that uses PCI Link Devices when in IO-APIC mode. Please attach the lspci -v output so we can get a better description of the hardware. Also, it would be interesting to know if the the systems works properly with the attached patch and "noapic" on the cmdline. Created attachment 1355 [details]
dmesg (kernel-BK + patch(id=1352)
Using current BK kernel + patch (id=1352), NO sound problem.
Created attachment 1356 [details]
/proc/interrupts: kernel-BK + patch (id=1352)
Created attachment 1357 [details]
lspci -v output
If I add 'pci=noacpi' cmdline option, X does not run.
I could see only BLANK screen.
I remember this system worked fine without ACPI (not-compiled into kernel). I
included ACPI code for automatic power-off (halt -p).
here is the /proc/interrupts with 'pci=noacpi':
CPU0
0: 6535 IO-APIC-edge timer
1: 151 IO-APIC-edge keyboard
2: 0 XT-PIC cascade
8: 1 IO-APIC-edge rtc
9: 0 IO-APIC-edge usb-uhci, usb-uhci
10: 3 IO-APIC-edge acpi, eth0
14: 4569 IO-APIC-edge ide0
15: 6 IO-APIC-edge ide1
NMI: 0
LOC: 6490
ERR: 0
MIS: 0
Thanks for confirming that the patch fixes the sound problem. the pci=noacpi problem is because the system is fooled into enabling the IOAPIC when it hasn't got IOAPIC info from ACPI (and MPS doesn't exist). this is bug #1219. Can you try out booting with "noapic"? Ah! I already tried 'noacpi'. Because I could not see any difference, I tried 'pci=noacpi'. I had no problem with 'noacpi' cmdline option. There is no such option "noacpi" -- so it is ignored. The option we want to try is "noapic". oops! With 'noapic', the sound works fine. I checked dmesg. ACPI: Skipping IOAPIC probe due to 'noapic' option. Kernel command line: ro hdc=ide-scsi vga=0x317 noapic ... And /proc/interrupts: 9: 0 XT-PIC usb-uhci, usb-uhci 10: 2143 XT-PIC acpi, eth0, VIA686A fix shipped in 2.4.23 2.6.0 patch is here: http://ftp.kernel.org/pub/linux/kernel/people/lenb/acpi/patches/test/2.6.0-test11/20031130031859-pci_link.patch included with latest ACPI for 2.6.0 here: http://ftp.kernel.org/pub/linux/kernel/people/lenb/acpi/patches/release/2.6.0-test11/ *** Bug 15427 has been marked as a duplicate of this bug. *** |