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shaft

As a suggestion you could try different DE's, you might see some improvements.
My favorites DE's are KDE Plasma, and Gnome. Obviously they're not as lightweight as XFCE.
You might want try them in...

Have you tried manually adjusting color setting on the monitor including brightness and sharpness(should take care of grainy issue)?

collector's

Screenlets had brightness widget prior to 19.04, and so did cairo-dock!

sudo apt-get install screenlets-pack-all
sudo apt install cairo-dock-core


You could try installing Brightness...

again

You can try this link to Enable automatic brightness:
https://help.ubuntu.com/stable/ubuntu-help/power-autobrightness.html.en

Does this happen often or only during high CPU?
Test with another OS, to eliminste hardware issues?
Post output of sensors:

sudo apt install lm-sensors
sensors-detect
sensors

OK, did you try dmesg or syslog?


tail /var/log/dmesg

flowering

Did you check here: /var/log/boot.log ?

Nextdoor

Does it lockup, do the keyboard key do anything?

What happens if you do Ctrl-Alt-F7 or f8, does that get you to x-server?

Good, there's also many docks you could try like docky, cairo-dock ..etc.

Lots of new search providers claim no tracking. Like Ecosia, and donates profits to reforestation.

sharp

Let's say you use along xterms, uxterm, and lxterm (they should already be pre-installed|)?

You didn't say what you're using?


inxi -S

May I ask why you're using NVidia 340, this ppa has the latest stable release nvidia-390 or nvidia-430 depending on your video card?


sudo add-apt-repository ppa:graphics-drivers/ppa
sudo...

You tried with xbacklight?


sudo apt install xbacklight

I recommend adding more ram if possible (8Gb), should make a big difference for old laptops to run newer Os's.

The brightness settings should be at color correction in nvidia-settings GUI, see attached screenshot.

Hi, welcome to the forum!

It's really hard to compare versions of Os's and their related different versions of software, changes may not always be compatible with your install.

And anything...

Glad you figured it out! You had two versions installed, they're different sources.

There's also PlayOnLinux, it install Windows games, IE, as well as many others.

You can use nvidia-settings to change brightness?

And in terminal to write the current X server configuration to ~/.nvidia-settings-rc



nvidia-settings --rewrite-config-file