[PATCH] drm: Add EDID_QUIRK_FORCE_REDUCED_BLANKING for ASUS VW222S

[Florian Mickler]

On Tue, 18 Dec 2012 23:33:20 +0100
Paul Menzel <paulepanter at users.sourceforge.net> wrote:

> Dear Florian,
> 
> 
> Am Dienstag, den 18.12.2012, 21:03 +0100 schrieb Florian Mickler:
> 
> > On Wed, 15 Aug 2012 17:40:40 +0200 Paul Menzel wrote:
> > 
> > > Date: Wed, 8 Aug 2012 23:12:19 +0200
> > > 
> > > Connecting an ASUS VW222S [1] over VGA a garbled screen is shown with
> > > vertical stripes in the top half.
> > 
> > This patch, which was merged in v3.6-rc4, makes the image on my ASUS
> > VW222U ca. 1 inch too wide left/right and top/bottom.  The effect is as
> > if the image was zoomed (bigger, more pixely).
> > 
> > Reverting it fixes the problem.
> 
> I am sorry for the trouble caused by this. As a work around, you could
> also specify the QUIRKS on the Linux command line.
> 
> > The Monitor is connected via VGA, but also has a DVI interface.
> > 
> > Maybe the quirk-apply criteria is too unspecific?
> 
> Hmm, I guess everything is identical but the DVI connector they added to
> the VW222U. Though I should have noticed the effect on the VW222S and
> did not. :(

Hm.. why should you have noticed the effect on the VW222S? Does it
happen there too?

> 
> Could you please send the `edid-decode` output on your system and
> `/var/log/Xorg.0.log`.
> 

I attached the xrandr --verbose output and the 
# get-edid  | parse-edid
output from http://www.polypux.org/projects/read-edid/ which I already
had installed. Hope this works for you too.



> Also I wonder how this quirk could create such a behavior.


Yes. I'm not shure how this could happen. It probably is either a bug
somewhere, or it is the 'natural' effect of misconfiguring the vga
pipeline.  Maybe someone more knowledgeable than me could make a more
educated guess about this.


> 
> [1] http://cgit.freedesktop.org/xorg/app/edid-decode/
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