| Bug ID | 109384 |
|---|---|
| Summary | Bad DisplayPort enumeration and wrong refresh rate with Hawaii chip |
| Product | DRI |
| Version | DRI git |
| Hardware | x86-64 (AMD64) |
| OS | Linux (All) |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | DRM/AMDgpu |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | fabio0x@keemail.me |
Created attachment 143150 [details]
Xorg.0 log with DC off
I'm running Solus KDE with kernel 4.20.2 but I've had these issues since kernel
4.19. Here's the list of issues with AMDGPU DC enabled:
- With Solus' default kernel flags I have wrong DisplayPort enumeration,
meaning that I get DisplayPort-1 when I turn on the computer, and then
DisplayPort-2 when I get my monitor to sleep and then I wake it up.
- If I put my computer on sleep (suspension) and then wake it up, I cannot set
a usable refresh rate. This means I actually get 40 Hz when I set 60, and 45 Hz
when I set 74 (yeah, I have a bit of screen "overclocking". That's how I found
DisplayPort enumeration is wrong).
- I get microstuttering, particularly noticeable when I drag windows around.
Now, all these issues are non existant if I set the amdgpu.dc=0 kernel flag.
Also, DisplayPort number is DisplayPort-0 under any circumstances.
❯ inxi -G
Graphics: Device-1: AMD Hawaii PRO [Radeon R9 290/390] driver: amdgpu v:
kernel
Display: x11 server: X.Org 1.20.3 driver: amdgpu,ati unloaded:
fbdev,modesetting,vesa
resolution: 1920x1080~60Hz
OpenGL:
renderer: AMD Radeon R9 200 Series (HAWAII DRM 3.27.0
4.20.2-107.current LLVM 7.0.0)
v: 4.5 Mesa 18.3.1
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