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TitaniumJones avatar Ubuntu

NVidia backlight control (Again) Ubuntu 21.04

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TitaniumJones

Wasn't sure where to post this, so it's in both the forums and also AskUbuntu. Sorry for the cross posting.

Hi, I've been using Ubuntu for about a year now and have just bought a new laptop. I installed Ubuntu once again along side Windoze 11 on separate partitions.

Like previously, the combination of i7 and NVidia GPU results in no backlight control.

Confident I could fix the problem like previously I went about searching the web for a solution. Unfortunatily, this time I have been unable to come up with a working solution for this laptop. So I'm reaching out for help.

Configuration: Dell Alienware X17 Intel i7 NVidia RTX3070 32Gb ram

Things I have tried:

  1. Adding acpi_backlight=vendor to the grub command line. Changed it to 'video' and also 'legacy'

  2. Adding nvidia nvidia-drm nvidia-modeset to /etc/initramfs-tools

  3. Added Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" Option "RegistryDwords" "EnableBrightnessControl=1" EndSection To /usr/share/X11/xorg.conf.d/10-nvidia.conf

  4. The output from xrandr | grep " connected" | cut -f1 -d " " results in XWAYLAND0 The output of xrandr --output XWAYLAND0 --brightness 0.7 results in no change

  5. The contents of /sys/class/backlight intel_backlight although I have seen other entries in here.

Any help would be greatfully recieved.

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24601 avatar
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24601
you missed out the version of ubuntu. please [edit] your question accordingly
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TitaniumJones avatar
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TitaniumJones
Additional to Test 1 I also tried leaving it blank with ie "quite splash acpi_backlight=" I've also tried it with "quiet splash acpi_backlight=linux"
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TitaniumJones avatar
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TitaniumJones
Yet another update. I've now done a clean install with Ubuntu 21.1 and tried all the usual methods to get the backlight working. Still nothing works. If anyone know's of tests I can do.... Even to find out the how the light is controlled.
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TitaniumJones
Interestingly, now, under 21.1, when I use xrandr | grep " connected" | cut -f1 -d " " I get eDP1. Typing xrandr --output eDP1 --brightness 0.7, the brightness does actually now change. But is it really changing the brightness or changing the saturation of the display?
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TitaniumJones
In my attempt to fix this issue I tried various versions of Linux and finally settled on Mint Linux. Out of the box there were no video drivers and many other things didn't work, like wifi and ethernet. I successfully got the backlight and all other hardware functioning by upgrading the kernel. The full solution can be found here. https://forums.linuxmint.com/viewtopic.php?f=59&t=364016&p=2113188#p2113188
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