Description of problem: GPU intensive tasks (gnome-shell, kde + desktop effects) cause audio crackling. A number of reports list the problem, for now there it is unclear whether the radeon KMS is causing it, but disabling KMS definitely resolves the problem (and prevents any graphics acceleration, hence no gnome-shell etc.) Version-Release number of selected component (if applicable): mesa-7.11-0.11.20110525.0.fc15 kernel-2.6.38.7-30.fc15 xorg-x11-drv-ati-6.14.1-1.20110504gita6d2dba6.fc15 How reproducible: always Steps to Reproduce: 1. run gnome-shell 2. start audio (rhythmbox, example audio test from gstreamer-properties) 3. quickly switch between desktops or keep pressing start (?) key to enter and leave activities screen Actual results: audio will be interrupted Expected results: audio plays without interruption Additional info: There is a number of reports on this here: https://bugs.freedesktop.org/show_bug.cgi?id=28106 https://bugzilla.kernel.org/show_bug.cgi?id=15912
Thanks for the bug report. We have reviewed the information you have provided above, and there is some additional information we require that will be helpful in our diagnosis of this issue. Please add drm.debug=0x04 to the kernel command line, restart computer, and attach * your X server config file (/etc/X11/xorg.conf, if available), * X server log file (/var/log/Xorg.*.log), * output of cat /proc/interrupts, * output of the dmesg command, and * system log (/var/log/messages) to the bug report as individual uncompressed file attachments using the bugzilla file attachment link above. We will review this issue again once you've had a chance to attach this information. Thanks in advance.
Created attachment 505191 [details] dmesg
Created attachment 505192 [details] /var/log/messages
Created attachment 505193 [details] /proc/interrupts
Created attachment 505194 [details] Xorg.0.log
Created attachment 505195 [details] lspci -vvx
let me know if there is anything else needed
Still a problem after updating to kernel-2.6.40-4.fc15.i686, as I reported in related freedesktop bug https://bugs.freedesktop.org/show_bug.cgi?id=28106 switching radeon power_profile to low seems to alleviate the problem
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