[Bug 92524] system hang on "radeon_hwmon_get_pwm1_enable"

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=92524

--- Comment #6 from Thomas DEBESSE <dev@illwieckz.net> ---
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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