[Bug 91880] Radeonsi on Grenada cards (r9 390) exceptionally unstable and poorly performing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91880

--- Comment #138 from Chris Waters <doublebytegames at gmail.com> ---
Update:

Finally had time to boot a liveCD (Ubuntu MATE 16.10) and try this all out.

I have multiple card listings in /sys/class/drm, but only one that is a card#
folder (ie card0), the rest are all variations on card0 plus  port type (eg
card0-HDMI-A-1).

I have no pp_dpm_sclk in /sys/class/drm/card0/device/ so I'm unable to do the
first command.

I have power_dpm_force_performance_level and I was going to at least try
setting it to manual just to see, but echo says "write error: Invalid argument"
when doing it as root and bash complains about lack of permissions when not
root (sudo makes no difference).

Mesa version is 12.0.3, so I'm grabbing Manjaro since that is running on Mesa
13 and will test there.

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