[Intel-gfx] [PATCH] drm/i915: prefer VBT modes for SVDO-LVDS over EDID

[Chris Wilson]

On Mon, Jun 10, 2013 at 09:47:58AM +0200, Daniel Vetter wrote:
> In
> 
> commit 53d3b4d7778daf15900867336c85d3f8dd70600c
> Author: Egbert Eich <eich at suse.de>
> Date:   Tue Jun 4 17:13:21 2013 +0200
> 
>     drm/i915/sdvo: Use &intel_sdvo->ddc instead of intel_sdvo->i2c for DDC
> 
> Egbert Eich fixed a long-standing bug where we simply used a
> non-working i2c controller to read the EDID for SDVO-LVDS panels.
> Unfortunately some machines seem to not be able to cope with the mode
> provided in the EDID (specifically they seem to not be able to cope
> with a 4x pixel mutliplier instead of a 2x one).
> 
> Since it took forever to notice the breakage it's fairly safe to
> assume that at least for SDVO-LVDS panels the VBT contains fairly sane
> data. So just switch around the order and use VBT modes first.
> 
> v2: Also add EDID modes just in case, and spell Egbert correctly.
> 
> Cc: Egbert Eich <eich at suse.de>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=65524
> Cc: stable at vger.kernel.org
> Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
Tested-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre