When my Lenovo Yoga 7 starts, suddenly, as soon as I can see the login screen, the monitor backlight gets dark. Even when I login it stays like this and I have to manually set illumination higher. Any idea where this comes from or how to stop it? Thanks in advance.
Asked
Active
Viewed 99 times
1
-
Did you already check out the answers for this question? – mchid Feb 10 '22 at 08:31
-
Thanks for the link. I tried it but no success. Instead of intel, I have amdgpu_bl0, just to mention – yano Feb 11 '22 at 17:52
1 Answers
1
Ok the answer was quite similar to the one mchid provided in his link.
So again, thanks for this hint.
The solution is acpi_backlight=vendor which can be done like this for example:
cd /etc/default
sudo nano grub
...
GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=vendor"
...
sudo update-grub
reboot
The value was taken from: https://www.kernel.org/doc/Documentation/admin-guide/kernel-parameters.txt
