Created attachment 618762 [details] Xorg.0.log Description of problem: glxgears stutters unless a key is held down, the pointer is continuously moved, or a shell script that repeatedly sleeps is run. The stuttering looks as though the gears briefly rotate a few degrees in one direction and then reverse direction. The motion is not smooth. The frame rate is about 10 FPS. If a key is held down, the rotation is in one direction and smooth. The frame rate increases to about 38 FPS. If the pointer is continuously moved, the rotation is likewise in one direction and smooth. The frame rate may reach about 62 FPS. Repeatedly running sleep from a terminal also results in smooth rotation: $ while true; do sleep 0.01; done The frame rate increases to about 62 FPS. Version-Release number of selected component (if applicable): xorg-x11-drv-intel-2.20.8-1.fc18.i686 kernel-3.6.0-0.rc7.git0.1.fc18.i686 Fedora Graphics Test Day CD image: 20120924-test_days-x86_64.iso https://fedoraproject.org/wiki/Test_Day:2012-09-27_Intel How reproducible: Always. Steps to Reproduce: 1. Run glxgears from a terminal. Observe the motion and the frame rate according to glxgears. 2. Hold down a key (e.g. the ctrl key), and observe the motion and frame rate. 3. Release the key and continuously move the pointer. Observe. 4. Stop moving the pointer, and run this shell script from a terminal: $ while true; do sleep 0.01; done Observe. Actual results: Motion stutters unless a key is held down, the pointer is continuously moved, or sleep is repeatedly run. Expected results: Motion does not stutter. Additional info: Stuttering can also be observed in some of the mesa demos, for example /usr/lib/mesa/reflect. A rotating molecule in avogadro may also stutter, although the stuttering is not as prominent. The stuttering also occurs with an updated F16 on the same hardware. Test cases: https://fedoraproject.org/wiki/QA:Testcase_intelvideo_glx https://fedoraproject.org/wiki/QA:Testcase_intelvideo_3D_mesa-demos https://fedoraproject.org/wiki/QA:Testcase_intelvideo_3D_avogadro
Created attachment 618763 [details] dmesg
Created attachment 618764 [details] /var/log/messages
Created attachment 618765 [details] glxgears output The frame rate increased to about 38 FPS while the ctrl key was held down. The frame rate increased to about 62 FPS while sleep was repeatedly run: $ while true; do sleep 0.01; done
Created attachment 618766 [details] $ rpm -qa kernel 'xorg*' 'glx*' 'mesa*' avogadro | sort
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