[Intel-gfx] 2.6.33 regression for intel hd in dell e6510, e6410 and possibly thinkpad x200s
zhenyuw at linux.intel.com
Sun May 23 19:32:33 PDT 2010
On 2010.05.23 12:11:28 +0200, Johannes Schauer wrote:
> 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 at 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
> 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
> Signed-off-by: Zhenyu Wang <zhenyuw at linux.intel.com>
> Signed-off-by: Eric Anholt <eric at 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:
> 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.
$gpg --keyserver wwwkeys.pgp.net --recv-keys 4D781827
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