https://bugs.freedesktop.org/show_bug.cgi?id=91880
--- Comment #182 from Chris Heald cheald@gmail.com --- Just adding a data point here, I've got an MSI R9 390 running on Ubuntu 18.04 on 4.15.0-10-generic - I haven't had any stability issues, but I have had maddening screen flickering/corruption.
I'm running dual 2560x1440 monitors off the card, which forces the memory clock to 1500MHz. However, when the GPU clock is at the 300MHz level, I get horrendous artifacting any time an accelerated portion of the screen is drawn. I can easily reproduce the issue by mousing over certain KDE widgets which are acclerated. Interestingly, running glxgears doesn't cause the issue.
* Setting power_dpm_force_performance_level -> high fixes it (but runs the clock up to its max, obviously) * Setting power_dpm_force_performance_level -> manual and then `echo 1234567 > pp_dpm_sclk` fixes it, with the GPU clock fixed to 500MHz.
I've been up and down this issue with both radeon and amdgpu drivers; neither seems to make a difference.
# lspci -nnk | grep -iA2 vga 06:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Hawaii PRO [Radeon R9 290/390] [1002:67b1] (rev 80) Subsystem: Micro-Star International Co., Ltd. [MSI] Hawaii PRO [Radeon R9 290/390] [1462:2015] Kernel driver in use: amdgpu
# cat vbios_version MS-V30823-F6
(Interestingly, this BIOS is newer than anything on techpowerup. I was hoping a BIOS flash would fix it, but I can't find anything newer)
I'll attach dmesg and Xorg logs as well. If I can provide extra data points, I'd like to help.