I am running:
Linux kernel 4.18.5
VG248QE DisplayPort 1080@144
$ cat /sys/class/drm/card1/device/vbios_version
I have an MSI R9 390, one of the bugged ones. I can boot successfully using cik_support=1 dpm=1 and dc=1.
The bug I am encountering is the following:
- Use default Xorg configuration
- Encounter white rectangles where there should be rendered content
ex: Desktop background is between 6 and 9 tenths white starting from the top going down. Only the rest of the bottom strip is showing.
ex: Firefox shows white rectangles of white pixels where there should be content. They vary in size and position and tend to show up after recent renderings. Can be 'wiped' away using the mouse-highlight.
I have managed to reduce the impact of this bug by switching off DRI2 by setting xorg configuration option AccelMethod to none. No other configuration of options (as they appear in the manpages for amdgpu) will work in removing these issues. This lets me utilize accelerated 3D graphics until I can get DRI2 up and running again.
It may be important to note that some applications will work, particularly when they are small windows, like when first opening a PDF. Scrolling and everything works normally, but when one maximizes the window to 1080p, the artifacts appear. One application that worked is MineTest, which appears to be using 2D rendering (poor performance with DRI2 off).
(In reply to tkdestroyer2+bugs-freedesktop from comment #0)
> I have an MSI R9 390, one of the bugged ones. I can boot successfully using
> cik_support=1 dpm=1 and dc=1.
Does not specifying the dpm parameter at all on the kernel command line or anywhere else make a difference?
Please attach a screenshot, the Xorg log file and the output of dmesg corresponding to the problem.
(In reply to Michel Dänzer from comment #1)
> Does not specifying the dpm parameter at all on the kernel command line or
> anywhere else make a difference?
I just tested. DPM is required to prevent crashing, but DC is not.
Created attachment 143071 [details]
> Please attach a screenshot, the Xorg log file and the output of dmesg
> corresponding to the problem.
The screenshot was not able to capture a majority of the screen (shown in black) for some reason. The point can still be seen in the bottom, in a screenshot of the freedesktop bug list.
Created attachment 143072 [details]
Created attachment 143073 [details]
(In reply to tkdestroyer2+bugs-freedesktop from comment #2)
> (In reply to Michel Dänzer from comment #1)
> > Does not specifying the dpm parameter at all on the kernel command line or
> > anywhere else make a difference?
> I just tested. DPM is required to prevent crashing, but DC is not.
4.18 and older used the old dpm implementation by default and setting to 1 selected the new one. The new on is default in 4.19, so you no longer need to specify dpm=1 as of 4.19.