xrand --output ... --off no longer turns the screen off on Linux >=4.15
Submitted by Maxim Malkov
Assigned to Xorg Project Team
Link to original bug (#107472)
Description
On Linux 4.14 and earlier, running xrandr --output ${MONITOR} --off will result in screen turning off (the monitor will say "no signal" or so).
Since 4.15, however, the screen will remain black, but turned on (backlight and everything).
I'm running xrandr 1.5.0 and X.Org Server 1.20.0.
This is caused by kernel change introduced here: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=846c7dfc1193eb2f9866fe2fa0ae7d45c72f95b9
I've sent an e-mail to kernel mailing lists as well.