Hi everyone! I have a problem that is driving me crazy these days. I have a Legion 5 (15IMH05) with: GeForce GTX 1650 Ti Nvidia driver 460 Ubuntu 20.04 installed kernel 5.11.0 latest bios updated (EFCN50WW) With F5/F6 buttons I can change the brightness bar, but brightness is not actually chan…

for me, no, it doesn’t help. But thanks for the reply anyway.

I also have the same laptop. Here is the few thing i noticed. Before fixing the issue, I was able to change the brightness with the command line. xrandr --output DP-2 --brightness 0.3 If you are not able to change the brightness through the command line, then you might have to reinstall the Ubun…

Thanks for the reply. I tried everything you mentioned but it’s still not working. I’m using kernel 5.11 and 465 nvidia drivers if it matters.

There must be something broken, it requires extensive debugging. The only straight forward solution is to Create a Systemd unit file and put the below command which runs every time when system boots up ( https://www.youtube.com/watch?v=unIAGt5pB7A ). [image] shashank_96: xrandr --output DP-2 --b…

xrandr is for changing brightness with software. That works for me but it just changes the gamma value and it doesn’t actually change the brightness, it just darkens the image. The GPU still uses full brightness which drains the battery in 2-3 hours while it should run for 8 hours.

Hi Still have this issue on nvidia 470 Actually NOTHING HELPED FROM ANY SOURCE except [Sivagami Nambi] Brightness problem Ubuntu 18.04 LTS brightness, 18.04 answered by Sivagami Nambi on 03:37PM - 26 Aug 19 UTC

Please list the contents of /sys/class/backlight via ls /sys/class/backlight Also please boot the system without parameter without nvidia-drm.modeset=1 and share test results.

For me, I only have acpi_video0 in /sys/class/backlight. The content of the brightness file changes when I try to change the brightness using the fn keys or through the UI, but the actual screen brightness stays the same. I removed all additional parameters from GRUB.

Is there anything else on this subject? @amrits . I removed that param from startup before to make it even start at all. Before that it was a black screen. The drivers are installed and working, just nu screen brightness control available. I have tried everything mentioned in this post, nothing he…

For @amrits as well I have a Lenovo Legion Y540 which is a precursor to the Legion 5. It’s model 15IRH, has only RTX 2060 Ti graphics (no hybrid in BIOS possible). Couple things I’ve found while troubleshooting. The Legion series was spec’d for primarily Windows gaming and so most likely will not…

Brightness not working Ubuntu 20.04 Lenovo Legion 5 (15IMH05)

Graphics / Linux Linux

grachara August 6, 2021, 10:25am 10

Hi
Still have this issue on nvidia 470
Actually NOTHING HELPED FROM ANY SOURCE except

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Brightness not working Ubuntu 20.04 Lenovo Legion 5 (15IMH05)

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