When the display locks after five minutes of activity on an X11 session, the
display will not unlock, the display remains black. SDDM is the login manager.

Does not occur under Wayland.

Reported on openSUSE Forums:
https://forums.opensuse.org/t/display-not-coming-out-of-sleep-in-x11-sessions/173578

~> inxi -G
Graphics:
  Device-1: AMD RS780L [Radeon 3000] driver: radeon v: kernel
  Display: x11 server: X.Org v: 21.1.12 with: Xwayland v: 23.2.6 driver: X:
    loaded: radeon unloaded: fbdev,modesetting,vesa dri: r600 gpu: radeon
    resolution: 1920x1080~60Hz
  API: EGL v: 1.5 drivers: kms_swrast,r600,swrast
    platforms: gbm,x11,surfaceless,device
  API: OpenGL v: 4.5 compat-v: 3.3 vendor: mesa v: 24.0.3 renderer: AMD
    RS780 (DRM 2.50.0 / 6.8.7-1-default LLVM 18.1.3)
  API: Vulkan Message: No Vulkan data available.