unable to adjust brightness

[dire beacon]

for some reason the ui works normally but it cant change the level of brightness of the laptop screen, i really dnt know what to do now

[desert goblet]

unable to adjust brightness

original title

I CNAT ADJUST THE BRIGHTNESS

[stoic galleon]

Hello, so the brightness slider is there, but it doesn't affect actual brightness?

[dire beacon]

Yes, exactly it

[stoic galleon]

Open the terminal please and paste the result of this command

inxi -MGxxx

[dire beacon]

Im going to sendo you a picture

[stoic galleon]

and

ls /sys/class/backlight/

please

[dire beacon]

It says it cant be found

[stoic galleon]

I'm guessing keyboard keys for brightness do not work either?

[dire beacon]

Yep

Apparently it doesn't detect the fn key

Oh wait

I misspelled

My bad

Ok i did it and a blue message came

It says acpi_video0

[stoic galleon]

only 1 element?

[dire beacon]

Yep

[stoic galleon]

Ok, wait a while please

[dire beacon]

Ok

[stoic galleon]

Ok, what does

cat /sys/class/backlight/acpi_video0/brightness

say?

[dire beacon]

It says 9

[stoic galleon]

Ok, move the brightness slider somewhere and re-run the command, does the number change?

[dire beacon]

Yep

It changes

[stoic galleon]

Alright. Next, restart then open the terminal and run

dmesg | grep -i backlight

does it show anything?

[dire beacon]

Its show some stuff

[stoic galleon]

Screenshot or photo it

Or copy paste text

[dire beacon]

Here js the screenshot

[stoic galleon]

Looks like you already tried a few kernel parameters?

[dire beacon]

Hehe, maybe

But it didn't work

[stoic galleon]

Did you set it through the file or system administration settings?

[dire beacon]

Set what? Like the comand, i just try it through the terminal

I suppose tru system administration settings

[stoic galleon]

I meant the acpi_backlight=legacy thing

[dire beacon]

Yep, i went to the terminal, i type the command sudo nano etc/default/grub and set it on the line grub cdmline linux default

I suppose i didn't do it through the system administration settings since i didn't use sys on the command

[stoic galleon]

Well doesn't matter that much, it's just system administration gives you a graphical way to do that

[dire beacon]

Oh

[stoic galleon]

If you're on mint 22.3

[dire beacon]

Yes, that my mint version

[stoic galleon]

Right, so let's do it this way: in the terminal type

sudo xed /etc/default/grub

in the opened file remove the lines you wrote acpi_backlight=legacy and acpi_osi=linux

And save the file

Photo it to be sure

[dire beacon]

So i leave it like this?

[stoic galleon]

yes, just save the file and close the editor

Next go to settings - system administration

[dire beacon]

Is this warning normal?

[stoic galleon]

In the opened window click + at the bottom, and add acpi_backlight=native then save settings

Yes, the warning's normal

[dire beacon]

Ok

[stoic galleon]

Show the window when done

[dire beacon]

It should be looking like this right?

[stoic galleon]

Yes, now press the green save button

[dire beacon]

Done

[stoic galleon]

After it's done the thing, restart and run

ls /sys/class/backlight/ ; dmesg | grep -i backlight

in the terminal - show result

[dire beacon]

Restar the laptop?

[stoic galleon]

Yes

[dire beacon]

This is what is showing

[stoic galleon]

Ok, try the brighness slider now

[dire beacon]

OMG IT WORKED

Thanks you so much maniak2000

[stoic galleon]

Great )) Do the keyboard brightness buttons work?

[dire beacon]

Nope, the fn key is still not working

[stoic galleon]

Well, that's still progress

[dire beacon]

What do you mean?

[stoic galleon]

I mean that brighness slider works now. Does keyboard keys for volume work?

[dire beacon]

Nope

The keyboard key for volume aren't working

Only the arrows

[stoic galleon]

arrows?

[dire beacon]

The arrow keys

Yep, the keyboard is kinda silly

[stoic galleon]

Ah... I see. can you photo full keyboard?

[dire beacon]

Sure

[stoic galleon]

huh... maybe try Fn+Alt+ arrows?

[dire beacon]

Nope

It doesn't do the function

[stoic galleon]

Let's see, do they even send the signal? in the terminal run

sudo apt install evtest -y && sudo evtest

and show the result

[dire beacon]

Its downloading something

It just finished

And now is showing a list of events

[stoic galleon]

Find the event number that corresponds to your keyboard and press that number. So press 4 then enter

Then press keys a s d and photo the result

[dire beacon]

Here it is

[stoic galleon]

good, now press right arrow and then fn + right arrow

[stoic galleon]

ok. press ctrl+c to exit, then type

lsmod | grep -i acer

if it shows anything - photo it

[stoic galleon]

Alright, it seems Fn key isn't recognized. I can suggest using other key combination for volume / brightness control, if you'd like?

[dire beacon]

Ok, if it is easier

[stoic galleon]

Alright, go to settings - keyboard - shortcuts, in the system - hardware you should be able to assign new keys for brightness and in audio - volume buttons for volume

[dire beacon]

Ok

Thanks