https://bugs.freedesktop.org/show_bug.cgi?id=29787
--- Comment #9 from Arno Schuring aelschuring@hotmail.com 2010-09-17 02:19:58 PDT --- While I still can't reproduce this at will, both the EDID errors and xrandr resets seem related to system load. When the system is idle, or I'm simply browsing or text-editing, the problems don't happen. However, when I'm stressing the system (which is not that hard on this old machine), for example creating a backup or compiling a kernel, I get multiple EDID errors per minute and occasional resets.
Since I've been running with the patch, I have only seen position resets on the left monitor. The right monitor has never lost its rotation.
I can't reproduce this by pegging the cpu, I need to generate a lot of disk activity. So I think it is related to latency rather than throughput. Also, X seems to hang for 50-500ms every time an EDID message appears in syslog, as I can see the mouse cursor freezing. When the freeze lasts more than a second, it is usually followed by an XRandR reset.