[Intel-gfx] Screen not turned on in kernel 2.6.35

[Jesse Barnes]

On Sat, 7 Aug 2010 20:09:32 +0200
Paul Neumann <paul104x at yahoo.de> wrote:

> Hi,
> 
> when I use kernel 2.6.35 my screen (connected via DVI) is not turned on. Everything else works fine so I can ssh into the machine and safely shut it down. This did not happen with 2.6.34. However I know that the issue is caused by that commit
> 
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b1083333de5357577c5ec55df6c7efa17bee41c7
> 
> If I revert that patch everything works as expected.
> 
> My graphics card is
> 
> 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
> 
> The interesting dmesg part is
> 
> i915 0000:00:02.0: BAR 6: can't assign [??? 0x00000000 flags 0x0] (bogus alignment)
> [drm] failed to find VBIOS tables
> [drm] initialized overlay support
> No connectors reported connected with modes
> [drm] Cannot find any crtc or sizes - going 1024x768
> Console: switching to colour frame buffer device 128x48
> 
> and xrandr shows
> 
> Screen 0: minimum 320 x 200, current 1024 x 768, maximum 4096 x 4096
> VGA1 disconnected (normal left inverted right x axis y axis)
> DVI1 disconnected (normal left inverted right x axis y axis)

Can you file a bug for this at bugs.freedesktop.org so it doesn't get
lost?

Adam's commit looks ok in general, but maybe your VBIOS is lying to us
in this case?

-- 
Jesse Barnes, Intel Open Source Technology Center