Nouveau - Feb 2019 - [Bug 109654] New: Nouveau picks bad mode setting 640x480 resolution

https://bugs.freedesktop.org/show_bug.cgi?id=109654

            Bug ID: 109654
           Summary: Nouveau picks bad mode setting 640x480 resolution
           Product: xorg
           Version: 7.7 (2012.06)
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: dan1espen at gmail.com
        QA Contact: xorg-team at lists.x.org

This has been discussed on the Nouveau mailing list.

When running this command:

xrandr -s 640x480

Nouveau only fills the screen horizontally, vertically it leaves 2/3s of the
screen at the top and bottom unused.  This makes this mode unusable.

Adding -r 75 to the above command fixes the problem.

Perhaps the higher frequency mode should be used by default.

The NVIDIA drivers do not have this problem, the screen is always filled.

This bug breaks games like "lbrickbuster2" which want to run full
screen at
640x480.

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https://bugs.freedesktop.org/show_bug.cgi?id=109654

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Created attachment 143385
  --> https://bugs.freedesktop.org/attachment.cgi?id=143385&action=edit
monitor edid

Nouveau doesn't pick these things -- it does what it's told.

It does, however, allow it. Sounds like something about the monitor should make
that illegal, but it's unclear what that would be.

Attaching EDID sent via ML. The interesting bits decode as

Established timings supported:
  720x400 at 70Hz 9:5 HorFreq: 31469 Hz Clock: 28.320 MHz
  640x480 at 60Hz 4:3 HorFreq: 31469 Hz Clock: 25.175 MHz
  640x480 at 75Hz 4:3 HorFreq: 37500 Hz Clock: 31.500 MHz
  800x600 at 60Hz 4:3 HorFreq: 37900 Hz Clock: 40.000 MHz
  800x600 at 75Hz 4:3 HorFreq: 46900 Hz Clock: 49.500 MHz
  1024x768 at 60Hz 4:3 HorFreq: 48400 Hz Clock: 65.000 MHz
  1024x768 at 75Hz 4:3 HorFreq: 60000 Hz Clock: 78.750 MHz
  1280x1024 at 75Hz 5:4 HorFreq: 80000 Hz Clock: 135.000 MHz
Standard timings supported:
  1920x1080 at 60Hz 16:9
  1600x1200 at 60Hz 4:3 HorFreq: 75000 Hz Clock: 162.000 MHz
  1280x1024 at 60Hz 5:4 HorFreq: 64000 Hz Clock: 108.000 MHz
  1280x800 at 60Hz 16:10
  1152x864 at 75Hz 4:3 HorFreq: 67500 Hz Clock: 108.000 MHz

CTA extension block
Extension version: 3
25 bytes of CTA data
  Video data block
...
    VIC   3 720x480 at 60Hz 16:9  HorFreq: 31469 Hz Clock: 27.000 MHz
    VIC   2 720x480 at 60Hz 4:3  HorFreq: 31469 Hz Clock: 27.000 MHz
    VIC   1 640x480 at 60Hz 4:3  HorFreq: 31469 Hz Clock: 25.175 MHz


So it certainly seems like 640x480 at 60 should work OK.

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https://bugs.freedesktop.org/show_bug.cgi?id=109654

Dan Espen <dan1espen at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOTOURBUG
             Status|NEW                         |RESOLVED

--- Comment #2 from Dan Espen <dan1espen at gmail.com> ---
Changing status to resolved.

I reinstalled the NVIDIA drivers, did an lsmod and noticed module
"nvidia_modeset" running.
I think that explains why I get different behavior with and without nouveau.

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