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Programmer avatar Ubuntu

No way of changing the screen brightness in Ubuntu Studio 20.04 LTS on a acer TravelMate

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Programmer

I am working on a Acer Travelmate 5360G with dual boot, Lubuntu 18.04 and Ubuntu Studio 20.04. In 18.04 I could not change brightness with Fn + ArrowLeft and Fn + ArrowRight, but I made a little python script which writes the value directly to /sys/class/backlight/intel_backlight/brightness and bound that to Alt + ArrowRight / ArrowLeft, which works perfectly fine.

I then tried doing the same on Ubuntu Studio 20.04, but it doesn't work there because /sys/class/backlight is just empty (gives file or directory not found) !
The weirdest thing on this is, that the first time I booted into 20.04, my script worked perfectly fine !? But the next time I booted, I got a grey screen forever. The solution for that was to add nomodeset to the grub options for 20.04. But after that, my brightness script stopped working !

I tried installing the proprietary drivers in software-properties-gtk, adding acpi_backlight=vendor acpi_osi=Linux to grub's boot options, I tried changing the brightness with brightness-controller, brightnessctl, xrandr, xbacklight, none of these did have any effect. If you need anymore details, please simply let me know - honestly, if you don't know a solution now, I'll just give up on Ubuntu Studio :( !

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Pedro Maimere avatar
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Pedro Maimere
Have you tried [this](https://askubuntu.com/questions/715306/xbacklight-no-outputs-have-backlight-property-no-sys-class-backlight-folder/1060843#1060843)?
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Programmer
@PedroMaimere no, will try tomorrow and let you know if it helped !
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Programmer
@PedroMaimere I did exactly what was described in the post you linked; neither that nor installing the proprietary drivers through `software-properties-gtk` helped - anymore ideas ?
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Programmer
@PedroMaimere finally fixed - see my post how ! :)
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Programmer avatar Ubuntu
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Programmer

I finally got my Fn brightness keys working ! Here is how:

  1. Reboot
  2. Go into BIOS by holding down F2
  3. Go to Main tab
  4. Change Graphic Mode from Switchable to Discrete
  5. Save changes and exit
  6. Continue boot
  7. et voila !

But … my screen resolution had become low, and everything looked as if someone had trod on it … somewhat squashed …

I was able to fix that, too:

  1. Open /etc/default/grub with root privileges in your favorite text editor
  2. Change #GRUB_GFXMODE=640x360 to GRUB_GFXMODE=1360x768 (my screen resolution is 1360x768)
  3. Run sudo update-grub

Additionally, I ran sudo prime-select intel - I do not know how much that helped. After that, it finally worked.

And, after 1 to 3 reboots (I dont know how much exactly), I finally even got the folders in /sys/class/backlight back ! :)

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