[Mesa-dev] [Bug 99978] rotation causes undefined behavior after updating mesa (radeon, x11, kernel 4.10)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99978

            Bug ID: 99978
           Summary: rotation causes undefined behavior after updating mesa
                    (radeon, x11, kernel 4.10)
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: Other
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: xaxazak at gmail.com
        QA Contact: mesa-dev at lists.freedesktop.org

Rotating one of my monitors makes it garbled and/or logs me out (causing
endless login loop).

Mesa 17.1 (padoka PPA).
Linux Kernel 4.10.
Xubuntu 16.10. (XFCE).
Radeon RX 480.

2 monitors:
A) Dell U2410 (1920x1080) via HDMI.
B) QNIX QX2710LED (2560x1440) via DVI.

Disabling #B doesn't help.

Not sure if this is a Mesa bug, but it's my best guess.
Note, this doesn't occur when using Unity, so it might be specific to X11?

I wonder if the unusual combo of HDMI + DVI might also be important - I did
find one related thread somewhere (lost it, sorry) mentioning they fixed
rotation issues by using different ports (Unfortunately, the QNIX only has
DVI).

This has been bugging me for a while, but I always rotated the monitor before
upgrading kernel/mesa etc so I didn't click that it was rotation until today.

Unfortunately I can't get a screenshot as it's too unstable. If it displays
anything before logging out it looks like strips of actual rotated desktop plus
strips of unintelligible data.

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