2.6.33 regression for intel hd in dell e6510, e6410 and possibly thinkpad x200s

2.6.33 regression for intel hd in dell e6510, e6410 and possibly thinkpad x200s

[Johannes Schauer]

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hi!

on newer kernels, whenever i modprobe i915 my screen goes black. the
backlight is still on and the machine continues working but now as a
headless system.

by bisection i found the commit that introduced this regression:

885a5fb5b120a5c7e0b3baad7b0feb5a89f76c18 is the first bad commit
commit 885a5fb5b120a5c7e0b3baad7b0feb5a89f76c18
Author: Zhenyu Wang <zhenyuw@linux.intel.com>
Date:   Tue Jan 12 05:38:31 2010 +0800

    drm/i915: fix pixel color depth setting on eDP

    Original DP mode_valid check didn't take pixel color depth into account,
    which made one 1600x900 eDP panel's mode check invalid because of
overclock,
    but actually this 6bpc panel does can work with x1 lane at 2.7G.
This one
    trys to take bpp value properly both in mode validation and mode
setting.

    Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
    Signed-off-by: Eric Anholt <eric@anholt.net>

:040000 040000 3c99ae05b82db5b8e453d2062bcf56743794476b
d7e0aa843fe4f8173f624572c77a7fe93b6fc455 M      drivers


this issue appears on my dell e6510 with intel hd (arrandale) and one
can find many bugreports about the same effect on the e6410 and thinkpad
x200s - all using said platform:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554569
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/561802

i also can confirm, that when removing the changes from this commit in
the most recent intel_dp.c then my display even works on 2.6.34 :)

cheers
josch


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Re: 2.6.33 regression for intel hd in dell e6510, e6410 and possibly thinkpad x200s

[Zhenyu Wang]

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On 2010.05.23 12:11:28 +0200, Johannes Schauer wrote:
> hi!
> 
> on newer kernels, whenever i modprobe i915 my screen goes black. the
> backlight is still on and the machine continues working but now as a
> headless system.
> 
> by bisection i found the commit that introduced this regression:
> 
> 885a5fb5b120a5c7e0b3baad7b0feb5a89f76c18 is the first bad commit
> commit 885a5fb5b120a5c7e0b3baad7b0feb5a89f76c18
> Author: Zhenyu Wang <zhenyuw@linux.intel.com>
> Date:   Tue Jan 12 05:38:31 2010 +0800
> 
>     drm/i915: fix pixel color depth setting on eDP
> 
>     Original DP mode_valid check didn't take pixel color depth into account,
>     which made one 1600x900 eDP panel's mode check invalid because of
> overclock,
>     but actually this 6bpc panel does can work with x1 lane at 2.7G.
> This one
>     trys to take bpp value properly both in mode validation and mode
> setting.
> 
>     Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
>     Signed-off-by: Eric Anholt <eric@anholt.net>
> 
> :040000 040000 3c99ae05b82db5b8e453d2062bcf56743794476b
> d7e0aa843fe4f8173f624572c77a7fe93b6fc455 M      drivers
> 
> 
> this issue appears on my dell e6510 with intel hd (arrandale) and one
> can find many bugreports about the same effect on the e6410 and thinkpad
> x200s - all using said platform:
> 
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554569
> https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/561802
> 
> i also can confirm, that when removing the changes from this commit in
> the most recent intel_dp.c then my display even works on 2.6.34 :)
> 

Can you send me kernel boot dmesg with drm.debug=7, intel_reg_dump and
VBIOS image dump? Better if you could file a new bug to fd.o, in case
your eDP panel issue is different from #28070.


-- 
Open Source Technology Center, Intel ltd.

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