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Ubuntu 16.04 dual monitor screen lock only blanks one screen RX 560

Question asked by vanboom on Apr 23, 2018

Configuration:  fresh install of Ubuntu 16.04 on AMD Ryzen 1700, ASUS ROG Hero VI, 2 monitor configuration.

My left monitor is connected to Display port.  Right monitor is connected to HDMI port. 

My screen blank time is configured to 10 minutes.

After 10 minutes, the primary monitor blanks, but the right monitor shows the ubuntu wallpaper, i.e. it does not go blank.


Is there a setting for this?  I have not installed any  special drivers, stock Ubuntu 16.04.

AMDGPU drivers are in play, version:  /lib/modules/4.13.0-38-generic/kernel/drivers/gpu/drm/amd/amdgpu/amdgpu.ko