Comment # 6
on bug 92524
from Thomas DEBESSE
So, some news! I've just tested with radeon.dpm=1, but less than 10 minute after the boot the graphic display completely hangs with graphic glitches (the system was available from ssh for example, but was not able to reboot), the command "cat /sys/class/hwmon/hwmon0/pwm1_enable" works (I did it *after* the graphical hang, so the graphical hang was not a consequence of this command). So, the glitch is another bug, but I now verified that "cat /sys/class/hwmon/hwmon0/pwm1_enable" is not a crash cause when radeon.dpm=1. Also, I tried to load amdgpu instead of radeon module, blacklinsting radeon, then I verified that with amdgpu.dpm=0 there is no "/sys/class/hwmon/hwmon0/pwm1_enable" file and with amdgpu.dpm=1, there is a "/sys/class/hwmon/hwmon0/pwm1_enable" file and I can "cat" it. So, the bug was not reproduced in amdgpu module, which is a good news. I've not yet tried to recompile the kernel to test your patch. I'm now running Ubuntu 15.10, of course it changes nothing about this bug, but they ship by default a 4.2 kernel so I can use my distro tools to recompile the kernel and do it cleanly, applying the patch on the official Ubuntu kernel tree.
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