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As a new Ubuntu user, I am facing a problem with my backlight. After succesfully dual booting Windows 11 and Ubuntu 20.04.3 LTS on my HP ENVY x360 15-es0570nd (Intel core i7 processor and NVIDIA grapics card), everything worked fine exept for brightness controll.

I tried to fix this by following the steps provided here: https://itsfoss.com/fix-brightness-ubuntu-1310/. (ls /sys/class/backlight/ showed (only) intel_backlight by then)

However, after creating and editing the "/usr/share/X11/xorg.conf.d/20-intel.conf" file, there were several glitches in my screen after normal boot. Since I had created this file, with a subsequent display fail, I decided to remove the file. (at the moment it is no longer present at my xorg.conf directory)

Since then my /sys/class/backlight/ folder is empty, whereas before it showed intel_backlight! I am not able to boot normally into Ubuntu (I get a black screen), I can only boot through recovery mode. (although I also get this first line stating: "/lib/recovery-mode/recovery-menu: line 80:/etc/default/rcS: no such file or directory")

I tried several things to re-install my backlight (but without succes)

Can anyone please help me to fix this problem? Many thanks!

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  • Install 21.10 instead. Your hardware is newer than the release you installed and that is never a good thing.
    – ChanganAuto
    Commented Nov 22, 2021 at 11:24
  • Thanks for you time ChanganAuto, will do that!
    – skgtg
    Commented Nov 23, 2021 at 12:23

1 Answer 1

Reset to default
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to me it happened after trying to install a appimage with the package FUSE. if thats the case boot into recovery mode and apt install ubuntu-desktop-minimal or apt install ubuntu-desktop will solve the issue

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