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

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Comment # 89 on bug 91880 from
Hi! I have been reading this bugreport since several days since it seems to be
very cloase to my situation!

I have a MSI r9 390. 
I have debian jessie with kernel 4.3, latest Mesa, and I also installed 
"firmware-amd-graphics" as jonas wrote in Comment 23. 

As it is now I can start debian both with Mate and Gnome, and of course Gnome
freezes much faster while it takes a while for Mate, also because, for some
reason, all the graphic funcionalities are deactivated in Mate, the docky
doesn't allow me to choose 3d icons for instance.
Gnome looks much better with all its windows-effects and nice graphic and it
makes me think that, a part from the freezing, the open source drivers work
fine. 

I have been making lots of tests, using different distribution with different
drivers, kernels and DE but nothing, same problem all the time! I get black
screens while working. I haven't tried yet to change the DPM, and I think that
it could be the solution! (I hope) I intend to do it now and run some tests!
But I have a couple of question first. 
Should I dowload the unicode as recommended by many like this

 http://people.freedesktop.org/~agd5f/radeon_ucode/

or this:

people.freedesktop.org/~agd5f/radeon_ucode/k/hawaii_k_smc.bin

or will the ones I have got in the debian package be enough?

Do I only need to run this command to make the tests: 
echo 'high' > '/sys/class/drm/card0/device/power_dpm_force_performance_level'

Or a do I need to stop the xserver first? (would it be gdm? I choose lightdm
when I installed gnome alongside Mate)

I apologize for all the questions that should be obvious after all the great
work you have done in this report but I'm afraid to do wrong and I'm not much
of an expert.


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