Comment # 7
on bug 82889
from Samir Ibradžić
I see this happening on Radeon HD 7950, kernel 3.13, which has the radeon dpm enabled by dafault. It is intermittent, happens on ~30% boots, and causes hang followed by reboot (no panic or oops msgs). Unfortunately, I could only catch the dmesg output via serial, when my machine hangs, kernel logs are not even saved to the disk. Now, I see "[drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed" on serial only when ignore_loglevel kernel parameter is unset. Machine will hang ad reboot each time I spot it. I attached here the dmesg with ignore_loglevel and drm.debug=1 params, both failure and ok cases, for comparison. When failing, the machine just hangs breefly, and reboots, right after "[drm] pitch is 7680" message. With radeon.dpm=0 parameter, this problem NEVER happns!
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