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rated 0 times [  1] [ 0]  / answers: 1 / hits: 1692  / 2 Years ago, sun, january 23, 2022, 8:38:02

I've got a fresh install of trusty (xubuntu if that matters, I don't think it should) on a Asus X551MAV-EB01-B. My function keys for brightness don't work. Here's what I know so far:



If I pass acpi_osi= or acpi_osi=! to grub I can get the brightness and wifi keys to work (I know this because I can see the OSD for brightness change), BUT:



in /sys/class/backlight I have two items:



acpi_video0 -> ../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video0

intel_backlight -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight


With cat I can see the brightness keys are adjusting acpi_video0/brightness and not intel_backlight/brightness.



I've also tried passng acpi_backlight=vendor to grub, and if I do that, then I end up with this : 



asus-nb-wmi -> ../../devices/platform/asus-nb-wmi/backlight/asus-nb-wmi/

intel_backlight -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight


acpi_backlight=vendor also stops the brightness keys from responding at all.



For now, I've set up an echo in /etc/rc.local to change the brightness a few seconds after lightdm starts... but where do I go from here?


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 Answers
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I've been using this (self-made) script for quite some time on my NVidia card and works fine. If @TheSchwa's solution doesn't work try this.



Install the script:




  1. Open a Terminal

  2. Type: sudo apt-get install -y inotify-tools and press Enter

  3. Type: sudo nano /usr/local/bin/backlight-sync and press Enter

  4. Copy the script from this page (has been adopted for your intel card already)

  5. Paste it into the Terminal window using Ctrl+Shift+V

  6. Press: Ctrl+X

  7. Press: y

  8. Press: Enter

  9. Type: sudo chmod a+x /usr/local/bin/backlight-sync and press Enter



Test the script:




  1. In the Terminal type sudo backlight-sync and press Enter

  2. Change your screen brightness at least once to see if its working

  3. Press Ctrl+C to quit



Enable the script during boot:




  1. In the Terminal type: sudo nano /etc/rc.local and press Enter

  2. Use the arrow keys to navigate above the line that says exit 0

  3. Type: /usr/local/bin/backlight-sync &

  4. Press: Ctrl+X

  5. Press: y

  6. Press: Enter

  7. Close the Terminal window


[#23869] Monday, January 24, 2022, 2 Years  [reply] [flag answer]
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