Turning screen off (mirroring) kills brightness adjustment

[lbriais]

When I start scrcpy with the --turn-screen-off command line option, or if I use ctrl-o keyboard shortcut, once running to keep the mirroring working while turning the screen off, then any subsequent screen brightness change is no more taken in account until I reboot.

No matter what I do after:

• Changing brightness manually
• Turning off and on adaptive brightness

The screen brightness will remain what it was before the scrcpy session. And this, until I reboot which eventually restores the mechanism.

If I run scrcpy without passing the command line option or issuing the ctrl-o keyboard shortcut, everything is fine from brightness adjustment point of view...

I didn't notice this initially, or at least didn't make the link as clear as it is now.
This is on Samsung S9 running /e/ (basically the same as LineageOS) based on Oreo , but a friend of mine running LineageOS on a Samsung S7 do not face the same issue...

[rom1v]

Some ROMs have bugs with screen power state. I even disabled the possibility to turn back the screen on via a shortcut due to similar problems: 8c8649c

Unfortunately, I think there's nothing scrcpy can do.