[Bug 47034] [G45] mode set failure with testdisplay, low resolution modes fail and display doesn't come back

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=47034

--- Comment #16 from yangguang <guang.a.yang at intel.com> ---
Created attachment 71707
  --> https://bugs.freedesktop.org/attachment.cgi?id=71707&action=edit
dmesg with commit 52bd02d8e3fd83201a1a81bdb4ec6fc0b54d24a0

(In reply to comment #15)
> Can you please test drm-intel-fixes? Specifically
> 
> commit 52bd02d8e3fd83201a1a81bdb4ec6fc0b54d24a0
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Fri Dec 7 10:43:24 2012 +0000
> 
>     drm/i915: Clear self-refresh watermarks when disabled
>     
>     If we elect to disable self-refresh as they require too many FIFO
>     entries, clear the values prior to writing them into the registers. If
>     they are too large they may occupy more bits than available and so
>     corrupt neighbouring WM values.
>     
>     Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
>     Reviewed-by: Jesse Barnes <jbarnes at virtuousgeek.org>
>     Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
I try this commit with -fixes, but the issue still occurs, the modes which
below 800x600 can't be displayed.

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