[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 #208 from emilio.moretti at gmail.com ---
(In reply to emilio.moretti from comment #207)
> (In reply to Sandeep from comment #206)
> > 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.
> 
> 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.

oh, sorry. There is a "typo" in my previous answer. For the unstable system you
need to remove amdgpu from the blacklisted modules. Let me "correct" the
unstable system configuration:

1) Make sure amdgpu can be loaded:
# vim /etc/modprobe.d/blacklist.conf
-> REMOVE "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

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/dri-devel/attachments/20180818/a3c9aa13/attachment-0001.html>