The difference between 21.10 and 22.04 might just be that we now default
to Wayland instead of Xorg. So the display subsystems are different.
Please run this command to gather more information:
apport-collect 1975557
And to save time in future please use the 'ubuntu-bug' command to report
new bugs.
** Tags added: jammy
** Package changed: xorg (Ubuntu) => gnome-shell (Ubuntu)
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1975557
Title:
blank screen does not turn off display backlight
Status in gnome-shell package in Ubuntu:
Incomplete
Bug description:
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.
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