| Bug ID | 109359 |
|---|---|
| Summary | Flickering and artifacts on dual 4K displays from RX 570 |
| Product | DRI |
| Version | unspecified |
| Hardware | x86-64 (AMD64) |
| OS | Linux (All) |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | DRM/AMDgpu |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | venemo@msn.com |
There are two Dell U2718Q 4K monitors connected to a Sapphire = Pulse RX 570 ITX card, one using the DisplayPort output and the other using the HDMI output. There is a visible flickering artifact on both displays. There is no problem when only a single display is connected. Searching online yields a couple of results that suggest a workaround: manu= ally increasing the shader and/or memory clock of the GPU. On the RX 570 the following commands can get rid of the problem: echo "manual" > /sys/class/drm/card0/device/power_dpm_force_pe= rformance_level echo "2" > /sys/class/drm/card0/device/pp_dpm_mclk echo "5 6 7" > /sys/class/drm/card0/device/pp_dpm_sclk However, I believe the amdgpu driver should be able to figure out the corre= ct necessary clock settings on its own. The problem exists in Linux 4.19 and 5.0-rc1 as well.
| What | Removed | Added |
|---|---|---|
| CC | harry.wentland@amd.com, sunpeng.li@amd.com |
Please attach your dmesg output and xorg log (if using X).
Created attachment 143126 [deta=
ils]
dmesg log
Created attachment 143127 [detai=
ls]
xorg log
I have the same issue with an RX480 if i set amdgpu.ppfeaturem= ask=3D0xffffffff (for overclocking), without any command line changes there is no flickering=
(In reply to keziolio123 from comment #4) > I have the same issue with an RX480 if i set amd= gpu.ppfeaturemask=3D0xffffffff > (for overclocking), without any command line changes there is no flick= ering That's because when you overclock, your clock speed gets high enough so that flickering doesn't happen.
I forgot about this bug. Looks like I misunderstood keziolio's= last comment. Yes, I can confirm that the problem is not present when amdgpu.ppfeaturemas= k is not set on the kernel command line.
| What | Removed | Added |
|---|---|---|
| Resolution | --- | MOVED |
| Status | NEW | RESOLVED |
-- GitLab Migration Automatic Message -- This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity. You can subscribe and participate further through the new bug through this = link to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/672.