Kernel Bug Tracker – Bug 7408
T60 stops triggering any ACPI events
Last modified: 2010-10-08 18:18:04 UTC
Most recent kernel where this bug did not occur:18.104.22.168 + patch
Distribution:kubuntu 6.06 LTS
Hardware Environment: T60 with intel graphics. See
BIOS at default setting - disk running in ahci mode
(this is why I need a patch for 2.6.18).
Not sure what to put here. Seems to happen both with and without X running.
after I do a full kernel compile, my T60 stops triggering any ACPI events:
tail -f /var/log/acpid does not show anything, even on Fn/F4 which is supposed
to be always enabled. Restarting the acpid doesn't do anything either - ACPI
starts working again, for a while, only after reboot.
Works fine in 2.6.18 ( + this patch http://lkml.org/lkml/2006/7/20/56).
Steps to reproduce:
git clone -s ~/scm/linux-2.6
make -j 4
no new ACPI events reported after this.
Created attachment 9338 [details]
Here's my .config for 2.6.19
I attached the .config for 2.6.19-rc3 with which I see the problem
Created attachment 9339 [details]
Here's the config for 22.214.171.124 that works well
I attached the .config for 2.6.18 (that works well) for reference
I see on my X60s too but triggered by suspend-to-ram/resume. kernel compiling
did not yet show this behaviour (but I diden't really check for I usually reboot
rather quickly after compiling/installing a new kernel)
the problem is there since the first post 2.6.18 version that I compiled a few
currently I run 2.6.18 with some patches, which suspends/resumes fine.
Yes, I see this too if I do not enable
IB thinkpad laptop extras under PM/ACPI -
in that case, kernel compile does not trigger the bug,
but suspend/resume does.
> Yes, I see this too if I do not enable
> IB thinkpad laptop extras under PM/ACPI -
> in that case, kernel compile does not trigger the bug
So the "no ACPI events after kernel build" regression
happens only if ibm_acpi is loaded?
> but suspend/resume does.
So ACPI events used to work in 2.6.18 after suspend/resume,
but do not work after suspend/resume in 2.6.19 -- and
this is true not matter if ibm_acpi is loaded or not?
> > Yes, I see this too if I do not enable
> > IB thinkpad laptop extras under PM/ACPI -
> > in that case, kernel compile does not trigger the bug
> So the "no ACPI events after kernel build" regression
> happens only if ibm_acpi is loaded?
Yes, it seems so.
> > but suspend/resume does.
> So ACPI events used to work in 2.6.18 after suspend/resume,
> but do not work after suspend/resume in 2.6.19 -- and
> this is true not matter if ibm_acpi is loaded or not?
This is true if ibm_acpi is not loaded. I did not test this with
Created attachment 9401 [details]
patch to ibm_acpi.c
There has been only 1 small patch to ibm_acpi.c between 126.96.36.199
and now. If you patch -Rp1 this commit, you'll be backing that
driver down to the version that worked in 2.6.18,
and the 2.6.19 run-time issue with ibm_acpi should go away -- yes?
However, it isn't clear that this simple patch to clear the experimental
flag could be the root of the run-time errors; and maybe we need to
re-confirm the assertion that the run-time (not the suspend-time) failure...
1. does not happen in 2.6.18 with ibm_acpi loaded
2. does not happen in 2.6.19 with ibm_acpi unloaded
3. only happens in 2.6.19 with ibm_acpi loaded
OK, it seems Linus has zeroed in on the bug:
I am running f9dadfa71bc594df09044da61d1c72701121d802
and no issues yet in several days of use.