It seems that it's not light-locker bug. Nothing special in
/var/log/lightdm, but in /var/log/Xorg.1.log found this error:
[ 23234.438] (==) ModulePath set to "/usr/lib/xorg/modules"
[ 23234.438] (II) The server relies on udev to provide the list of input
devices.
If no devices become available, reconfigure udev or disable AutoAddDevices.
[ 23234.438] (II) Loader magic: 0x55cb261fa020
[ 23234.438] (II) Module ABI versions:
[ 23234.438] X.Org ANSI C Emulation: 0.4
[ 23234.438] X.Org Video Driver: 23.0
[ 23234.438] X.Org XInput driver : 24.1
[ 23234.438] X.Org Server Extension : 10.0
[ 23234.440] (++) using VT number 8
[ 23234.440] (II) systemd-logind: logind integration requires -keeptty and
-keeptty was not provided, disabling logind integration
[ 23234.442] (II) xfree86: Adding drm device (/dev/dri/card0)
[ 23234.442] (EE) /dev/dri/card0: failed to set DRM interface version 1.4:
Permission denied
[ 23234.442] (II) xfree86: Adding drm device (/dev/dri/card1)
[ 23234.450] (--) PCI:*(0:0:2:0) 8086:0116:1028:04ca rev 9, Mem @
0xf6400000/4194304, 0xd0000000/268435456, I/O @ 0x0000f000/64, BIOS @
0x????????/131072
[ 23234.450] (--) PCI: (0:1:0:0) 10de:0df5:1028:04ca rev 161, Mem @
0xf5000000/16777216, 0xe0000000/268435456, 0xf0000000/33554432, I/O @
0x0000e000/128, BIOS @ 0x????????/524288
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https://bugs.launchpad.net/bugs/1796374
Title:
locking session turns off external monitor
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