[Bug 58696] New: Choppy video playback in VLC with R600g on Radeon HD 6620G

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=58696

          Priority: medium
            Bug ID: 58696
          Assignee: dri-devel@lists.freedesktop.org
           Summary: Choppy video playback in VLC with R600g on Radeon HD
                    6620G
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: runetmember@gmail.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Drivers/DRI/R600
           Product: Mesa

Video playback of almost any typical 10Mbps 1080p BDRip is choppy (many dropped
frames) in VLC if R600g driver is used instead of fglrx on Radeon HD 6620G GPU. 
Enabling/disabling composting doesn't make difference (so this issue is not
duplicate of https://bugs.freedesktop.org/show_bug.cgi?id=47776 ).
Enabling/disabling "Suspend desktop effects for fullscreen windows" KWin
options doesn't make difference for fullscreen playback.
There is little difference between xv and OpenGL (GLX) output in VLC - xv
output a little faster but gives choppy playback too.

Issue is not reproducible:
1. in mplayer (SMPlayer is used) with R600g driver,
2. in Firefox (1080p VP8 playback) in Chrome (1080p H.264 playback) and in
Adobe Flash 11.5 plugin (1080p H.264 too) with R600g driver.
3. in VLC with fglrx driver (hardware decoder is not enabled).

Issue happen only in VLC&R600g combination.

VLC always uses indirect rendering instead of direct so I check mplayer
playback with disabled direct rendering and with enabled direct rendering but I
doesn't notice any difference. AFAIK mplayer and VLC drops frames very
differently so I check mplayer with disabled frame drop and with enabled frame
drop but (again) doesn't notice any difference. So I doesn't sure what exactly
is wrong in VLC&R600g combination but choppy video playback happen only in this
combination for sure. In my opinion issues most likely is relevant only for APU
hardware.

Video sample used for testing: http://www.multiupload.nl/56CCVTW42H (most
noticeable slowdown happen since 00:32).

Software:
Linux 3.8rc1
libdrm 2.4.40+git20121123.171666e4
Mesa 9.1~git20121222.a585b8f3
xserver-xorg-video-radeon 7.0.99+git20121207.793e1b0e
Xserver 1.13.0.902+git20121207
VLC 2.0.5 (default settings tested too - no difference)
mplayer 1.0~rc4.dfsg1+svn34540
Kubuntu 12.10 x86_64, Xorg Edgers PPA enabled.

Hardware:
A8-3500M with Radeon HD 6620G.

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