[Bug 202799] New: amd/dc: right monitor sometimes never comes back up on dual-display setup after locking session

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=202799

            Bug ID: 202799
           Summary: amd/dc: right monitor sometimes never comes back up on
                    dual-display setup after locking session
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.0
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: libcg at protonmail.com
        Regression: No

Created attachment 281547
  --> https://bugzilla.kernel.org/attachment.cgi?id=281547&action=edit
xrandr --props output

- linux 5.0 (4.20 also had the same issue)
- xf86-video-amdgpu 18.1.0
- GNOME 3.30

Left screen is a Dell U2412M (1920x1200), right screen is a Dell P2715Q (4K
monitor set at 2560x1440, primary). GPU is RX 580.

Steps to reproduce:
- Lock session, screens turn off
- After a while, press a key to turn the screens back on again
- When the left screen lights up first, the system only displays an image on
the left screen. The right screen lights up afterwards but goes back to sleep
because it's getting no signal, although xrandr still recognizes it.  I need to
manually turn off the right screen and back on again to get it to reconfigure.

When using `amdgpu.dc=0`, this issue disappears.

-- 
You are receiving this mail because:
You are watching the assignee of the bug.