Re: Oops removing thinkpad_acpi and video on git:linux-acpi-2.6

[Henrique de Moraes Holschuh <hmh@hmh.eng.br>]

On Thu, 18 Oct 2007, Luca Capello wrote:
> I just got the following oops when removing thinkpad_acpi and then
> video.  Kernel is the linux-acpi-2.6 git branch up to

If you never load thinkpad_acpi in the first place, just video, and then
remove video, does the oops happen?  I can't help much with video, but
thinkpad-acpi is my responsability.

> Just before the oops, dmesg shows the following, with the first being
> the event generated by brightness up/down with Fn keys and the second
> the ThinkFinger [1] device:
> =====
> thinkpad_acpi: unknown LID-related HKEY event: 0x5010
> input: Virtual ThinkFinger Keyboard as /class/input/input99
> =====

Yeah, that 5010 event seems to mean "something in NVRAM changed".
thinkpad-acpi just punts it to userspace.  That event is gone in later BIOS
revisions, I think.

> This is on a Lenovo ThinkPad X60 [2], ThinkPad BIOS 7BETD0WW (2.11)
> [3] and EC 7BHT40WW-1.13, kernel compiled using the Debian
> kernel-package.

You have a BIOS with bugs.  Please consider updating.

> [3] I'm aware there's a new version, but I'm waiting to understand if
>     I can upgrade it using Free Software only (i.e. without the Lenovo
>     bootable CD)

No. You should use the CD if you can.  Otherwise, you are risking your
warranty, which is a very dumb thing to do.

Anyway, refer to http://thinkwiki.org/wiki/BIOS_Upgrade for upgrade
experiences on the X60 using various methods.

>  [<ffffffff80325172>] acpi_os_execute_notify+0x0/0x2c
>  [<ffffffff8032aae5>] acpi_ev_notify_dispatch+0x57/0x60
>  [<ffffffff80325195>] acpi_os_execute_notify+0x23/0x2c

Looks like either thinkpad-acpi or video forgot to remove a notify handler
before unloading.  Or maybe it is a race.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh