[Bug 105733] Amdgpu randomly hangs and only ssh works. Mouse cursor moves sometimes but does nothing. Keyboard stops working.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105733

--- Comment #31 from Jan Jurzitza <bugs.freedesktop.org at webfreak.org> ---
I have found a workaround (amd patched kernel not required):

cat /sys/class/drm/card0/device/pp_dpm_sclk
# insert appropriate index here, I went for 1077Mhz
echo 3 > /sys/class/drm/card0/device/pp_dpm_sclk

Makes the GPU a bit slower (changes clock to 1077 Mhz on my card) for the
session, but at least applications don't freeze the system anymore now (or at
least this is delaying it so much that it works for multiple hours, but it
didn't freeze for me yet)

Though because of the slowdown I don't think this is a good solution long-term.
Maybe a hint towards a solution though maybe? What I noticed in radeon-profile
is that on auto it is capable of running at the boost frequency (1266 Mhz) and
not limited to the base frequency the product page specifies (1120 Mhz) by
default, so I changed it here and it basically fixed it.

Fixes the issue on kernel 4.18.4

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