[Intel-gfx] [PATCH 2/2] drm/i915/lvds: Use i915.lvds_fixed_mode= as a last resort

[Mike Isely]

On Wed, 20 Apr 2011, Mike Isely wrote:

> On Wed, 20 Apr 2011, Chris Wilson wrote:
> 
> > On Wed, 20 Apr 2011 14:48:36 -0500 (CDT), Mike Isely <isely at isely.net> wrote:
> > > 
> > > Chris:
> > > 
> > > I've tested this patch and it doesn't help us here.  Even if I add 
> > > lvds_fixed_mode=<whatever>, the display still comes up with the messed 
> > > up configuration from the motherboard's completely ignorant BIOS.  It 
> > > appears that lvds_fixed_mode is being ignored by the driver.
> > 
> > You can test the functionality of the patch by parsing
> > i915.lvds_fixed_mode first rather than last.
> 
> I will test for that - it was the next thing I was going to dig into.

Just tested this.  However the results were not conclusive.

It looks like the driver did notice the specified mode and used it - 
because the display's refresh rate did get adjusted and the overall 
resolution is correct.  However the display timings are slightly "off", 
the image is stretched a few pixels off the right edge and a few lines 
off the bottom edge.  Yet the same modeline given to "video=" in 
combination with my controversial disable-fixed-mode patch however 
produces a perfectly aligned image.

There might some other affect here.  I'm not testing in the same git 
repo in the two cases and there are other differences.  So this problem 
might be unrelated to the patch.  I will sort that out.

  -Mike

-- 

Mike Isely
isely @ isely (dot) net
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