[Bug 82055] New: [HAWAII] Running some programs, when HW acceleration is on, causes X to spike in CPU usage → unresponsive desktop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82055

          Priority: medium
            Bug ID: 82055
          Assignee: dri-devel at lists.freedesktop.org
           Summary: [HAWAII] Running some programs, when HW acceleration
                    is on, causes X to spike in CPU usage → unresponsive
                    desktop
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: kai at dev.carbon-project.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Drivers/Gallium/radeonsi
           Product: Mesa

When running certain programs (eg. MediathekView) or watching recorded
broadcasts on Twitch, X starts going up in CPU usage and the desktop becomes
unresponsive, until you kill the stream or the program has finished its draw
operations (can take several seconds). Interestingly enough, YouTube videos are
not affected. In both cases I had HW video acceleration on (through settings in
/etc/adobe/mms.conf), without HW acceleration the plugin is just consuming
ridiculous amounts of CPU cycles.
The problem with Twitch is independent off chosen video quality.

My desktop environment is KDE 4.13.3 with desktop effects enabled (compositing
type=OpenGL 3.1, render target=native), disabling them has no effect on this
issue.

I haven't seen these issues with my previous HD7850 (also using Glamor),
therefore I think this is separate to bug 68524.

My stack is (base: Debian Testing):
GPU: Hawaii PRO [Radeon R9 290] (ChipID = 0x67b1)
Linux: Git:~agdf5/linux:drm-next-3.17-rebased-on-fixes:fa053e7263 (calls itself
3.16-rc6) + attachment 93015 [details] [review]
libdrm: Git:master/libdrm-2.4.56
LLVM: SVN:trunk/r214546 (3.6 snapshot)
libclc: Git:master/5b48f170c8
Mesa: Git:master/e41cc45361
DDX: Git:master/4b5060f357 + Patch from
http://lists.x.org/archives/xorg-driver-ati/2014-July/026517.html
X: 2:1.16.0-2 (1.16.0)

Let me know, if you need further information.

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