You have been subscribed to a public bug:
I updated a system from 21.10 to 22.04 and noticed that when the screen
is blanked by no keyboard or mouse activity that the backlight in the
VGA monitor is still on. The "settings->Displays" has "Unknown Display"
which I assume means the system does not know what commands to send to
the monitor to shut it off. I booted a live DVD of 21.10 and the
settings has the VGA display as 'AOC 22" ' which is correct and the
screen blanking works correctly. So it seems that the definition for
the AOC displays have been removed from 22.04.
This behavior is different on Ubuntu 21.10, the VGA display is blank and the
backlight is off. A minor nit is on 21.10 the "settings->Displays" shows the
VGA display manufacture name, on 22.04 the
VGA display manufacture name is "Unknown Display".
I have discovered that the settings have the following options
"settings->Power->Screen Blank" with a time value to be selected and the
following text on the next line "Turns the screen off after a period of
inactivity"
"settings->Privacy->Screen->Blank Screen Display" with a time value to be
selected and the following text on the next line "Period of inactivity after
which the screen will go blank"
The two options have different actions but seem to be connected because
changing the time on one changes the time on the other.
My guess is that the update changed the action for Ubuntu 22.04. I
would like the 21.10 behavior, that is to turn off the VGA display not
just blank the display when selecting the "settings->Power->Screen
Blank" for 22.04.
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
--
blank screen does not turn off display backlight
https://bugs.launchpad.net/bugs/1975557
You received this bug notification because you are a member of Ubuntu Touch
seeded packages, which is subscribed to xorg in Ubuntu.
--
Mailing list: https://launchpad.net/~touch-packages
Post to : touch-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~touch-packages
More help : https://help.launchpad.net/ListHelp
