[Nouveau] [Bug 47846] Nouveau -> overscan using HDMI

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=47846

--- Comment #6 from Ben Skeggs <skeggsb at gmail.com> 2012-04-13 01:03:37 PDT ---
(In reply to comment #5)
> After playing with xrandr and this new underscan parameter I have concluded
> this is just an ugly workaround that doesn't fix the root problem which is
> getting EDID right.
> 
> Everything still looks wrong, I think the problem is that by using this
> underscan thing the applications still think the resolution is 1366x768 when
> its no longer the case.
> And of course there is also the overscan at boot time problem.
> 
> So is there any way to fix the way nouveau interprets the EDID data to make it
> work like nvidia's driver?

I'll add this to my list to look at.  There is some hints in the EDID extension
blocks that say whether or not a display will overscan a given resolution or
not, and flags in the AVI InfoFrame that can (possibly) control it too.

I looked into this at some point, and couldn't find a device that actually
obeyed the specs so I didn't bother in the end.  It's possible the NVIDIA
binary driver is doing this I guess.  However, for most displays, even with the
NVIDIA binary driver you have to use their "Overscan Compensation" option too..

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