Ubuntu MATE 22.04 LTS Strange Display issues on Kernel 5.19 and 6

[ricmarques]

Hi again, @MW0DCM-Dave

You wrote:

@MW0DCM-Dave

Alas this "Workaround" didn't help. I've since tried Ubuntu Unity 22.04 with Kernel 6.2.0-33-generic and Ubuntu vanilla aka GNOME with the same kernel on 22.04.1 and the screen dimming when I move the pointer around the screen and then goes brighter within a second of none movement, the issue is also there when typing either in the terminal window or the the search on each menu hud, and on anything else that shows a text box, type and it dims then stop and it goes brighter(...).

As you say that the "variable" screen brightness / dimming issue you're experiencing also happens when using "regular" Ubuntu 22.04.1 with the GNOME Desktop environment, may I suggest checking, for that regular Ubuntu case (with GNOME), if "Automatic Brightness" is turned on and, if it is, try to turn it off and see if that solves the problem? You can find how to do that, for instance, in the following tutorial in the "It's FOSS" web site:

How to Turn Off Automatic Brightness on Ubuntu [Quick Tip]

Regarding Ubuntu MATE, as far as I know, there is no "Automatic Brightness" feature to turn "on" or "off". For Ubuntu MATE, I guess you can try disabling (uncheck) the "Dim display when idle" option - and/or, for the case of being "On Battery Power", you could (also) uncheck the option called "Reduce backlight brightness" - that are available by going to the Ubuntu MATE Menu and then choosing "Preferences" - > "Power Management" (which will open the "Power Management Preferences" window / dialog box):

Screenshot of the "On AC Power" tab of "Power Management Preferences":

Screenshot of the "On Battery Power" tab of "Power Management Preferences":

There are at least two posts here in the Ubuntu MATE Community may also be useful to you. The first post was written by @goinglinux (Larry Bushey) on May 2022:

GPD P2 Max 2022 brightness control

Welcome to the Ubuntu-MATE community forum @jimla. I don't have a GPD-pocket computer, but here is a suggestion that worked on my old HP laptop which had non-functioning brightness control buttons. I created two scripts, one to increase brightness and one to decrease brightness. I assigned each script to the appropriate key by creating a custom keyboard shortcut for each. (Instructions on creating custom keyboard shortcuts are here.) Here are the two scripts. Feel free to copy and customize the…

And the second post was written by @Philippe (on February 2023):

Notification area icon to set screen's brightness

Hello, Small script to add an icon in the notification area, to set the screen's brightness, by right clic. Usefull in specific situation. yad is required: sudo apt install yad #!/bin/bash # Script to add an icon in the notification area, # to set the screen's brightness, by right clic # Require yad : sudo apt install yad get_active_monitors() { xrandr | awk '/\ connected/ && /[[:digit:]]x[[:digit:]].*+/{print $1}' } # Name of the screen DisplayName=$(get_active_monitors) # set by d…

@MW0DCM-Dave: You've also asked:

@MW0DCM-Dave

Is there any way I can report this issue to the Kernel Dev's just to highlight the issue? Or any of the Ubuntu flavour Dev's so it can be looked at?

I'm guessing that the best you could do to report this specific / kind of issue is to follow the instructions available in the following "Kernel/Debugging/Backlight" web page in the "Ubuntu Wiki":

https://wiki.ubuntu.com/Kernel/Debugging/Backlight

I hope this helps. Please, keep us posted