On 2010-08-30 11:57 +0200, Pekka Enberg wrote:
> On Mon, Aug 30, 2010 at 12:36 PM, Sven Joachim <svenjoac at gmx.de> wrote:
>> On my laptop which has a 1280x800 display, only the upper left 848x480
>> pixels are used on the console in 2.6.36-rc3. ?The resolution is
>> correct, but /sys/class/graphics/fb0/modes looks like this:
>>
>> U:848x480p-0
>>
>> This is a regression from 2.6.35. ?The graphics card according to lspci:
>>
>> 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS,
>> 943/940GML Express Integrated Graphics Controller (rev 03)
>
> Yeah, you're not alone on this:
>
> http://lkml.org/lkml/2010/8/23/452
Incidentally, I did not notice the problem initially described in this
thread, and 2.6.36-rc2 actually seems OK for me. But after this commit:
commit 9559fcdbff4f93d29af04478bbc48294519424f5
Author: Jesse Barnes <jbarnes at virtuousgeek.org>
Date: Tue Aug 24 11:31:16 2010 -0700
drm/i915: fix vblank wait test condition
When converting this to the new wait_for macro I inverted the wait
condition, which causes all sorts of problems. So correct it to fix
several failures caused by the bad wait (flickering, bad output
detection, tearing, etc.).
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
Tested-by: Sitsofe Wheeler <sitsofe at yahoo.com>
Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
@ -992,7 +992,7 @@ void intel_wait_for_vblank(struct drm_device *dev, int pipe)
/* Wait for vblank interrupt bit to set */
if (wait_for((I915_READ(pipestat_reg) &
- PIPE_VBLANK_INTERRUPT_STATUS) == 0,
+ PIPE_VBLANK_INTERRUPT_STATUS),
50, 0))
DRM_DEBUG_KMS("vblank wait timed out\n");
}
only the upper left 848x480 pixels of the display are used for the
framebuffer. Booting with the video=1280x800 commandline option works
around this problem.
Sven
