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.
Please attach the corresponding Xorg log file.
Created attachment 140953 [details] Log of running X.org on Linux 4.14.57
Created attachment 140954 [details] Log of running X.org on Linux 4.17.9
I attached the logs. At the end of each log, I turned the screen off and on several times. The logged messages are the same regardless of kernel version. The logs themselves don't change much either.
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