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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Radeonsi on Grenada cards (r9 390) exceptionally unstable and poorly performing"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91880#c207">Comment # 207</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Radeonsi on Grenada cards (r9 390) exceptionally unstable and poorly performing"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91880">bug 91880</a>
from <span class="vcard"><a class="email" href="mailto:emilio.moretti@gmail.com" title="emilio.moretti@gmail.com">emilio.moretti@gmail.com</a>
</span></b>
<pre>(In reply to Sandeep from <a href="show_bug.cgi?id=91880#c206">comment #206</a>)
<span class="quote">> You've got to make sure that radeon and amdgpu drivers don't clash.
>
> Try the following kernel parameters: radeon.si_support=0
> radeon.cik_support=0 amdgpu.si_support=1 amdgpu.cik_support=1 amdgpu.dpm=1
>
> That's what I use and it works fine for me.</span >
Thanks, but I did that. Here is my process:
Stable system configuration (power management doesn't crash):
1) Make sure amdgpu is blacklisted:
# vim /etc/modprobe.d/blacklist.conf
-> add "blacklist amdgpu" at the bottom
# update-initramfs -u -k all
2) Update grub parameters:
# vim /etc/default/grub
-> Set the correct defaults: GRUB_CMDLINE_LINUX_DEFAULT="radeon.cik_support=1
amdgpu.cik_support=0"
# update-grub
3) reboot the system
Unstable system configuration (power management crashes the entire system when
it tries to power off the monitors):
1) Make sure amdgpu can be loaded:
# vim /etc/modprobe.d/blacklist.conf
-> add "blacklist amdgpu" at the bottom
# update-initramfs -u -k all
2) Update grub parameters:
# vim /etc/default/grub
-> Set the correct defaults: GRUB_CMDLINE_LINUX_DEFAULT="radeon.cik_support=0
amdgpu.cik_support=1 amdgpu.modeset=1 amdgpu.dc=1 amdgpu.dpm=1"
# update-grub
3) reboot the system
It's a fairly easy way to test it as is freezes every time you leave the PC
idle. I haven't seen it crash during my daily usage, but it does crash when the
power management kicks in.</pre>
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