FS#58325 - [linux] 4.16.3-1-ARCH causing screen flashing

Attached to Project: Arch Linux
Opened by joe (joe1984) - Monday, 23 April 2018, 22:46 GMT
Last edited by Doug Newgard (Scimmia) - Saturday, 12 May 2018, 03:04 GMT
Task Type Bug Report
Category Kernel
Status Closed
Assigned To Tobias Powalowski (tpowa)
Jan Alexander Steffens (heftig)
Architecture x86_64
Severity High
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 1
Private No

Details

Description:
I am using the xf86-video-ati drivers, and when I upgraded to this kernel version, the screen randomly blinks, sometimes going completely black. Desktop effects are no longer smooth as before. I can get the screen back by turning off desktop effects with Alt-Shift-F12, so I guess this is possibly a kwin problem ?? I was able to temporarily fix the issue by downgrading my kernel to 4.15.15-1-ARCH. Here is an excerpt of my journal, with repeating lines I attribute to the problem. This same line appeared about 50 times in my journal for the current boot.

org_kde_powerdevil[758]: powerdevil: Kbd backlight brightness value: 0
org_kde_powerdevil[758]: powerdevil: Kbd backlight brightness value: 0
org_kde_powerdevil[758]: powerdevil: Kbd backlight brightness value: 0
org_kde_powerdevil[758]: powerdevil: Kbd backlight brightness value: 0

Here is an excerpt of lspci -v for my video card.

00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Mullins [Radeon R4/R5 Graphics] (rev 45) (
prog-if 00 [VGA controller])
Subsystem: Lenovo Mullins [Radeon R4/R5 Graphics]

Also, changing the compositor rendering backend to opengl 3.1 or xrender does not fix the problem, and actually makes it worse.
This task depends upon

Closed by  Doug Newgard (Scimmia)
Saturday, 12 May 2018, 03:04 GMT
Reason for closing:  Fixed
Additional comments about closing:  linux 4.16.8-1
Comment by joe (joe1984) - Sunday, 29 April 2018, 21:20 GMT
I just switched to the xf86-video-amdgpu driver, and the issue is still there. All post 4.15.15-1-ARCH kernels seem to be affected.

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