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Thread: Lower fps in GLXgears. Problem with animations in gnome. [ATI 4250]

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    Join Date
    Feb 2012
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    125

    Lower fps in GLXgears. Problem with animations in gnome. [ATI 4250]

    Hi,
    I'm having an issue with animations sometimes stuttering in Gnome Shell and also stuttering animations in KDE.
    Hardware is AMD Phenom 965BE at stock clock of 3.4ghz 4 cores, 4GB RAM, ATI IGP 4250 (512mb shared) on GA-880GM-d2h. Linux Ubuntu 13.04 beta 2 running Gnome 3.8.
    I noticed that a lot of the time, animations like switching windows from the Overview would be smooth. But some of the times, they would stutter a bit when choosing new window, but not all the time.
    So I ran glxgears without vertical sync and found that it would run at 1903 fps and lower but would drop down to 120 fps with the gears window maximized. I noticed after maximizing the window, the gears move smooth but after a couple seconds, the gears stutter once. And then smooth as before. I've noticed this when maximizing that it does stutter once. As in stops for a split second and goes on, but it is fast so that it looks like a stutter.
    Code:
    glxgearsATTENTION: default value of option vblank_mode overridden by environment.
    ATTENTION: default value of option vblank_mode overridden by environment.
    9519 frames in 5.0 seconds = 1903.720 FPS
    9521 frames in 5.0 seconds = 1904.061 FPS
    3656 frames in 5.0 seconds = 730.943 FPS
    650 frames in 5.0 seconds = 129.774 FPS
    648 frames in 5.0 seconds = 129.414 FPS
    6733 frames in 5.0 seconds = 1346.474 FPS
    4657 frames in 5.0 seconds = 931.127 FPS
    648 frames in 5.0 seconds = 129.582 FPS
    655 frames in 5.0 seconds = 130.926 FPS
    655 frames in 5.0 seconds = 130.751 FPS
    657 frames in 5.0 seconds = 131.268 FPS
    2036 frames in 5.0 seconds = 407.195 FPS
    8530 frames in 5.0 seconds = 1705.916 FPS
    9036 frames in 5.0 seconds = 1807.191 FPS
    9204 frames in 5.0 seconds = 1840.696 FPS
    9082 frames in 5.0 seconds = 1816.361 FPS
    9104 frames in 5.0 seconds = 1820.722 FPS
    9210 frames in 5.0 seconds = 1841.893 FPS
    9233 frames in 5.0 seconds = 1846.515 FPS
    9195 frames in 5.0 seconds = 1838.849 FPS
    Then I switched back to the default vsync. It runs excellent at refresh rate with normal window size. After maximizing, it still runs at the same frame rate.
    Then I decided to see what would happen when switching between four windows from the overview. It is smooth. But after some time, I switch to a window, and there's stutter in the animation where the window slides to the front of the desktop. And whenever I notice a stutter in the animation, it also shows up in glxgears as a drop in the fps so it falls down to 50, 51, etc. when there's stutter.

    Code:
    glxgearsRunning synchronized to the vertical refresh.  The framerate should be
    approximately the same as the monitor refresh rate.
    301 frames in 5.0 seconds = 60.127 FPS
    300 frames in 5.0 seconds = 59.940 FPS
    300 frames in 5.0 seconds = 59.939 FPS
    300 frames in 5.0 seconds = 59.940 FPS
    300 frames in 5.0 seconds = 59.939 FPS
    300 frames in 5.0 seconds = 59.941 FPS
    300 frames in 5.0 seconds = 59.938 FPS
    300 frames in 5.0 seconds = 59.941 FPS
    300 frames in 5.0 seconds = 59.938 FPS
    300 frames in 5.0 seconds = 59.829 FPS
    300 frames in 5.0 seconds = 59.939 FPS
    300 frames in 5.0 seconds = 59.940 FPS
    278 frames in 5.0 seconds = 55.446 FPS
    259 frames in 5.0 seconds = 51.765 FPS
    261 frames in 5.0 seconds = 52.132 FPS
    269 frames in 5.0 seconds = 53.636 FPS
    273 frames in 5.0 seconds = 54.491 FPS
    295 frames in 5.0 seconds = 58.779 FPS
    300 frames in 5.0 seconds = 59.903 FPS
    297 frames in 5.0 seconds = 59.345 FPS
    287 frames in 5.0 seconds = 57.353 FPS
    274 frames in 5.0 seconds = 54.612 FPS
    259 frames in 5.0 seconds = 51.640 FPS
    259 frames in 5.0 seconds = 51.795 FPS
    270 frames in 5.0 seconds = 53.831 FPS
    283 frames in 5.0 seconds = 56.542 FPS
    269 frames in 5.0 seconds = 53.764 FPS
    284 frames in 5.0 seconds = 56.725 FPS
    260 frames in 5.0 seconds = 51.818 FPS
    264 frames in 5.0 seconds = 52.428 FPS
    267 frames in 5.0 seconds = 53.376 FPS
    276 frames in 5.0 seconds = 55.154 FPS
    265 frames in 5.0 seconds = 52.955 FPS
    278 frames in 5.0 seconds = 55.535 FPS
    297 frames in 5.0 seconds = 59.345 FPS
    295 frames in 5.0 seconds = 58.731 FPS
    292 frames in 5.0 seconds = 58.353 FPS
    293 frames in 5.0 seconds = 58.541 FPS
    293 frames in 5.0 seconds = 58.539 FPS
    I'm not sure what all this means, if anything. But I want to get the stuttering animation issue resolved, because while I love Gnome Shell, I hate having even a slightly jerky experience. It's very annoying over time. My BIOS is up to date (version FF from Gigabyte). Please help me. What do I need to do? Is this stuttering animation issue a bug in the driver? A bug in gnome-shell? And is there a workaround? Thanks.
    Last edited by DisappearingOak; April 18th, 2013 at 12:17 AM.

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