[Bug 93879] kernel 4.4.0 causes application lockup and unusable interfaces with radeon hardware

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93879

            Bug ID: 93879
           Summary: kernel 4.4.0 causes application lockup and unusable
                    interfaces with radeon hardware
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: jimmy at boombatower.com

Created attachment 121320
  --> https://bugs.freedesktop.org/attachment.cgi?id=121320&action=edit
sh -c "cat /proc/version; ./scripts/ver_linux; cat /proc/cpuinfo; cat
/proc/modules; cat /proc/ioports; cat /proc/iomem; lspci -vvv; cat
/proc/scsi/scsi" > env_info

While running Plasma 5 on 4.4.0 the following occurs periodically:
- chromium locks up
- plasma desktop locks up
- unable to enter password on plasma lock screen

A trigger for locking chromium up seems to be to resize the window by dragging
to screen edges (top to fullscreen, left to tack up left half of screen, etc).
Otherwise, it also seems to somewhat randomly freeze over time.

Reverting to 4.3.x resolves the issues.

Environment
-----------

Distro: openSUSE Tumbleweed (20160121) (x86_64)
Kernel version: 4.4.0-1.2 (works on <= 4.3.3-6)
OpenGL renderer string: Gallium 0.4 on AMD TAHITI (DRM 2.43.0, LLVM 3.7.0)
OpenGL core profile version string: 4.1 (Core Profile) Mesa 11.1.0
Xorg version: 7.6_1.18.0-5.2
xf86-video-ati version: 7.6.1-1.2
DRI3 enabled
Hardware: Radeon HD 7970 ghz

output from kernel bug reporting guide attached

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