[Mutter 41.4] "Mirror mode" display mode has poor performance over external HDMI monitor
- Fedora 35
- Mutter 41.4
- Wayland, didn't try X11
- Hardware: AMD R5 3600, AMD RX 5700XT gpu, 32GB DDR4 dual-channel RAM, both monitors (DP and HDMI 60Hz)
Bug summary
When having "mirror mode" enabled in display settings the performance of HDMI second screen is incredibly poor. It isn't a driver issue since it works well on "extended display" or "single display" option. It has only started happening with mutter 41.4 update.
Steps to reproduce
- Have mutter 41.4 set up
- Connect an external HDMI monitor
- Set the display mode to "mirror mode" and compare the performance to other modes (it is horrible)
What happened
The performance is poor. I'd say around 15 or 20 fps.
What did you expect to happen
To work as it did before 41.4 update, smooth 60fps rendering.
Edited by MaCroX95