Reverse prime fails with xserver 1.20
Submitted by Ismo Toijala
Assigned to Xorg Project Team
Created attachment 139906 journalctl -b
Since updating to server 1.20, the modesetting driver fails to turn on the second display.
- Intel 460M
- Radeon 5650 mobile
Error message: $ xrandr --output HDMI-1-1 --auto xrandr: Configure crtc 2 failed
I use the modesetting driver for both GPUs. LVDS is connected to Intel and HDMI to Radeon.
I bisected and found the problem begins with bc4d2781 modesetting: Use atomic modesetting to set DPMS mode
Attachment 139906, "journalctl -b":