Ubuntu 20.04 backlight problem, only boots from recovery mode

skgtg

3/22/23, 10:25 AM

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!

0 + 0

dual-boot

nvidia

backlight

brightness

intel

ChanganAuto

3/22/23, 11:24 AM

Install 21.10 instead. Your hardware is newer than the release you installed and that is never a good thing.

skgtg

3/23/23, 12:23 PM

Thanks for you time ChanganAuto, will do that!

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Ubuntu 20.04 backlight problem, only boots from recovery mode

TH: ปัญหาไฟแบ็คไลท์ของ Ubuntu 20.04 บูตจากโหมดการกู้คืนเท่านั้น

RO: Problemă cu iluminarea de fundal Ubuntu 20.04, pornește doar din modul de recuperare

RU: Проблема с подсветкой Ubuntu 20.04, загружается только из режима восстановления

VI: Sự cố đèn nền Ubuntu 20.04, chỉ khởi động từ chế độ khôi phục

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.