Nouveau - Dec 2014 - [Bug 87715] New: Changing resolution away from 1680x1050 results in scattered display

https://bugs.freedesktop.org/show_bug.cgi?id=87715

            Bug ID: 87715
           Summary: Changing resolution away from 1680x1050 results in
                    scattered display
           Product: Mesa
           Version: 10.4
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: bruno at wolff.to

Created attachment 111332
  --> https://bugs.freedesktop.org/attachment.cgi?id=111332&action=edit
dmesg output just after attempt to switch to 800x600 and recovery

When I boot up and login I end up with the desktop in 1680x1050 resolution. I
can do scaling to get other effective resolutions, but if I actually try to
switch the used resolution to any of the other availble ones (e.g. 1280x1024,
800x600) I end up with parts of the output scattered all over the screen in
medium sized blocks. Usually the screen will switch back to 1680x1050 and work
OK when I don't confirm I want to stay in the new resolution, but sometimes
things end up messed up when it switches back and I ned to shutdown to recover.
I am using x86_64 Fedora 21 with various kernels. I have seen this issue with
the normal 3.17 kernels, 3.18 rawhide nodebug kernels and the mainline 3.19
kernel (the latter fixes another Nouveau problem I had).
Currently mesa is at 10.4, though I think it was at 10.3 when I first switched
this machine over to linux and I still had the same issue.
The reason I care about this is that I want to play some games in wine that use
800x600 and the workaround of using xrandr scaling before and after slows
things down and is ugly.

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--- Comment #1 from Bruno Wolff <bruno at wolff.to> ---
Created attachment 111333
  --> https://bugs.freedesktop.org/attachment.cgi?id=111333&action=edit
xorg.log

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https://bugs.freedesktop.org/show_bug.cgi?id=87715

Bruno Wolff <bruno at wolff.to> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bruno at wolff.to

--- Comment #2 from Bruno Wolff <bruno at wolff.to> ---
I restested this after updating to 3.19 with
08b022a9655bf925e6683422590306429b752ccd which included:
 nouveau:
          fix 3.18 regression for old userspace

Things are still behaving the same way.

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--- Comment #3 from Ilia Mirkin <imirkin at alum.mit.edu> ---
http://cgit.freedesktop.org/~darktama/nouveau/commit/?id=74a8f4fb816b90ec1468855b88ed365b6e15876c

Does this prevent your issue?

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Drivers/DRI/nouveau         |Driver/nouveau
            Version|10.4                        |git
            Product|Mesa                        |xorg
            Summary|Changing resolution away    |[NV50] Changing resolution
                   |from 1680x1050 results in   |away from 1680x1050 results
                   |scattered display           |in scattered display
         QA Contact|                            |xorg-team at lists.x.org

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--- Comment #4 from Bruno Wolff <bruno at wolff.to> ---
I tried out
http://cgit.freedesktop.org/~darktama/nouveau/commit/?id=74a8f4fb816b90ec1468855b88ed365b6e15876c
but it didn't seem to change things for me. Trying to switch to 800x600
still
resulted in a garbled display.

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--- Comment #5 from Bruno Wolff <bruno at wolff.to> ---
Is it worth testing this on mesa 10.5 at this time? 10.5 is in rawhide and the
3.19 kernel will probably be soon. I don't want to move the affected machine
on
to rawhide right now, but I could test a live image in the not too distant
future.

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--- Comment #6 from Bruno Wolff <bruno at wolff.to> ---
Would it be worth testing this with i686 to see if it is x86_64 specific?

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--- Comment #7 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Bruno Wolff from comment #5)
> Is it worth testing this on mesa 10.5 at this time? 10.5 is in rawhide and
> the 3.19 kernel will probably be soon. I don't want to move the
affected
> machine on to rawhide right now, but I could test a live image in the not
> too distant future.
The issue is almost definitely in the kernel. Potentially it's tickled by
xf86-video-nouveau. Mesa is almost definitely not connected.

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--- Comment #8 from Bruno Wolff <bruno at wolff.to> ---
Does
http://cgit.freedesktop.org/mesa/drm/commit/?id=d7c0a08bc576deb07df6c3f91f393ca8edd0c4bf
(modetest: Allocate dumb buffers with the correct bpp) look like a change that
might help me? (i.e. is it worth me rebuilding libdrm to test?)

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--- Comment #9 from Bruno Wolff <bruno at wolff.to> ---
I tested
http://cgit.freedesktop.org/mesa/drm/commit/?id=d7c0a08bc576deb07df6c3f91f393ca8edd0c4bf
, but it didn't help.

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Bruno Wolff <bruno at wolff.to> changed:

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

--- Comment #10 from Bruno Wolff <bruno at wolff.to> ---
Things seem to be working now. I am not sure what fixed it. I recently got mesa
10.5 and I am running 3.20 test kernels.

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