[2.6.22] ACPI video problems with T60p laptop

[2.6.22] ACPI video problems with T60p laptop

[Chris Rankin]

Hi,

I have noticed the following problems with the ACPI video functionality on my Thinkpad T60p
laptop:

- The kernel is likely to lock up when the video.ko modules loads, if nmi_watchdog=1
- The VID/ directory appears twice in the /proc/acpi/video/ directory:

$ ls -alis /proc/acpi/video/
total 0
4026532147 0 dr-xr-xr-x  4 root root 0 2007-07-24 22:17 .
4026531915 0 dr-xr-xr-x 12 root root 0 2007-07-24 19:27 ..
4026532169 0 dr-xr-xr-x  5 root root 0 2007-07-24 22:17 VID
4026532169 0 dr-xr-xr-x  5 root root 0 2007-07-24 22:17 VID

- Close the laptop lid, wait a bit, open the lid again, and the X server has crashed. (The kernel
survives, but the screen is a multi-coloured mess. Ctrl-Alt-Backspace still works, though.)

ACPI: SSDT 7FEF1D36, 02C4 (r1  PmRef  Cpu0Ist      100 INTL 20050513)
ACPI: SSDT 7FEF207F, 065A (r1  PmRef  Cpu0Cst      100 INTL 20050513)
Monitor-Mwait will be used to enter C-1 state
Monitor-Mwait will be used to enter C-2 state
Monitor-Mwait will be used to enter C-3 state
ACPI: CPU0 (power states: C1[C1] C2[C2] C3[C3])
ACPI: Processor [CPU0] (supports 8 throttling states)
ACPI: SSDT 7FEF1C6E, 00C8 (r1  PmRef  Cpu1Ist      100 INTL 20050513)
ACPI: SSDT 7FEF1FFA, 0085 (r1  PmRef  Cpu1Cst      100 INTL 20050513)
ACPI: CPU1 (power states: C1[C1] C2[C2] C3[C3])
ACPI: Processor [CPU1] (supports 8 throttling states)
ACPI: Thermal Zone [THM0] (35 C)
ACPI: Thermal Zone [THM1] (37 C)

...

ACPI: AC Adapter [AC] (on-line)
ACPI: Battery Slot [BAT0] (battery present)
ACPI: ACPI Dock Station Driver 
ACPI: \_SB_.PCI0.IDE0.PRIM.MSTR: found ejectable bay
ACPI: \_SB_.PCI0.IDE0.PRIM.MSTR: Adding notify handler
ACPI: Bay [\_SB_.PCI0.IDE0.PRIM.MSTR] Added
input: Power Button (FF) as /class/input/input3
ACPI: Power Button (FF) [PWRF]
input: Lid Switch as /class/input/input4
ACPI: Lid Switch [LID]
input: Sleep Button (CM) as /class/input/input5
ACPI: Sleep Button (CM) [SLPB]
set_level status: 0
ACPI: Video Device [VID] (multi-head: yes  rom: no  post: no)
set_level status: 0
ACPI: Video Device [VID] (multi-head: yes  rom: no  post: no)

Cheers,
Chris




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Re: [2.6.22] ACPI video problems with T60p laptop

[Henrique de Moraes Holschuh]

On Tue, 24 Jul 2007, Chris Rankin wrote:
> - The kernel is likely to lock up when the video.ko modules loads, if nmi_watchdog=1

NEVER use nmi_watchdog on thinkpads.  IBM/Lenovo's crap of a SMBIOS is
deeply alergic to NMIs while handling a SMI.

I don't know why the nmi_watchdog is not blacklisted on thinkpads, I recall
someone wanted to do that and sent a patch...

> - The VID/ directory appears twice in the /proc/acpi/video/ directory:
> 
> $ ls -alis /proc/acpi/video/
> total 0
> 4026532147 0 dr-xr-xr-x  4 root root 0 2007-07-24 22:17 .
> 4026531915 0 dr-xr-xr-x 12 root root 0 2007-07-24 19:27 ..
> 4026532169 0 dr-xr-xr-x  5 root root 0 2007-07-24 22:17 VID
> 4026532169 0 dr-xr-xr-x  5 root root 0 2007-07-24 22:17 VID

This is stuff that is overloaded by a SSDT in the thinkpad. Maybe something
is weird with that?

-- 
  "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

Re: [2.6.22] ACPI video problems with T60p laptop

[Zhang Rui]

On Tue, 2007-07-24 at 22:34 +0100, Chris Rankin wrote:
> Hi,
> 
> I have noticed the following problems with the ACPI video functionality on my Thinkpad T60p
> laptop:
> 
> - The kernel is likely to lock up when the video.ko modules loads, if nmi_watchdog=1
> - The VID/ directory appears twice in the /proc/acpi/video/ directory:
> 
> $ ls -alis /proc/acpi/video/
> total 0
> 4026532147 0 dr-xr-xr-x  4 root root 0 2007-07-24 22:17 .
> 4026531915 0 dr-xr-xr-x 12 root root 0 2007-07-24 19:27 ..
> 4026532169 0 dr-xr-xr-x  5 root root 0 2007-07-24 22:17 VID
> 4026532169 0 dr-xr-xr-x  5 root root 0 2007-07-24 22:17 VID
> 
Hmm, duplicated device names show in /proc.
As the ACPI procfs won't be removed in the near future, we need
something else rather than the string from BIOS as the device name.
Another problem is that procfs doesn't care if there are any duplicated
names.

> - Close the laptop lid, wait a bit, open the lid again, and the X server has crashed. (The kernel
> survives, but the screen is a multi-coloured mess. Ctrl-Alt-Backspace still works, though.)

Please open another bug at bugzilla.kernel.org and attach the dmesg,
acpidump and lspci output.

Thanks,
Rui
> ACPI: SSDT 7FEF1D36, 02C4 (r1  PmRef  Cpu0Ist      100 INTL 20050513)
> ACPI: SSDT 7FEF207F, 065A (r1  PmRef  Cpu0Cst      100 INTL 20050513)
> Monitor-Mwait will be used to enter C-1 state
> Monitor-Mwait will be used to enter C-2 state
> Monitor-Mwait will be used to enter C-3 state
> ACPI: CPU0 (power states: C1[C1] C2[C2] C3[C3])
> ACPI: Processor [CPU0] (supports 8 throttling states)
> ACPI: SSDT 7FEF1C6E, 00C8 (r1  PmRef  Cpu1Ist      100 INTL 20050513)
> ACPI: SSDT 7FEF1FFA, 0085 (r1  PmRef  Cpu1Cst      100 INTL 20050513)
> ACPI: CPU1 (power states: C1[C1] C2[C2] C3[C3])
> ACPI: Processor [CPU1] (supports 8 throttling states)
> ACPI: Thermal Zone [THM0] (35 C)
> ACPI: Thermal Zone [THM1] (37 C)
> 
> ...
> 
> ACPI: AC Adapter [AC] (on-line)
> ACPI: Battery Slot [BAT0] (battery present)
> ACPI: ACPI Dock Station Driver 
> ACPI: \_SB_.PCI0.IDE0.PRIM.MSTR: found ejectable bay
> ACPI: \_SB_.PCI0.IDE0.PRIM.MSTR: Adding notify handler
> ACPI: Bay [\_SB_.PCI0.IDE0.PRIM.MSTR] Added
> input: Power Button (FF) as /class/input/input3
> ACPI: Power Button (FF) [PWRF]
> input: Lid Switch as /class/input/input4
> ACPI: Lid Switch [LID]
> input: Sleep Button (CM) as /class/input/input5
> ACPI: Sleep Button (CM) [SLPB]
> set_level status: 0
> ACPI: Video Device [VID] (multi-head: yes  rom: no  post: no)
> set_level status: 0
> ACPI: Video Device [VID] (multi-head: yes  rom: no  post: no)
> 
> Cheers,
> Chris
> 
> 
> 
> 
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Re: [2.6.22] ACPI video problems with T60p laptop

[Chris Rankin]

--- Zhang Rui <rui.zhang@intel.com> wrote:
> Please open another bug at bugzilla.kernel.org and attach the dmesg,
> acpidump and lspci output.

http://bugzilla.kernel.org/show_bug.cgi?id=8812

Cheers,
Chris



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