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I have tried various approaches including xbacklight(and other guides online to change it) but nothing worked.

xrandr command gives me Failed to get size of gamma for output default

xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080
default connected primary 1920x1080+0+0 0mm x 0mm
   1920x1080     77.00* 
sudo lshw -c video

gave the following output

*-display UNCLAIMED       
       description: VGA compatible controller
       product: Intel Corporation
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 01
       width: 64 bits
       clock: 33MHz
       capabilities: pciexpress msi pm vga_controller bus_master cap_list
       configuration: latency=0
       resources: iomemory:600-5ff iomemory:400-3ff memory:603e000000-603effffff memory:4000000000-400fffffff ioport:3000(size=64) memory:c0000-dffff memory:4010000000-4016ffffff memory:4020000000-40ffffffff

I have intel iris xe graphics.

I had initially tried installing elementary os Hera. I wasn't able to make brightness control work and then I decided to try ubuntu 20.04. In elementary sys/class/backlight had a folder called asus-nb-wmi. In ubuntu its completely empty. Is this because there are no drivers available for my laptop graphics/video?

Output for bash sudo find /sys/ -type f -iname '*brightness*' https://paste.ubuntu.com/p/tDXnCvGBDJ/

1 Answer 1

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Use the glxinfo -B or inxi -G to check whether the graphics card is actually loaded. If not, you could refer to this question Ubuntu 20.04 no driver loaded for Intel Iris Xe Graphics, where the solution is to upgrade ubuntu to 20.10

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  • I had to upgrade to 20.10 and it worked. Thanks! Dec 11, 2020 at 7:56

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