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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.

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  • Did you already check out the answers for this question?
    – mchid
    Feb 10, 2022 at 8:31
  • Thanks for the link. I tried it but no success. Instead of intel, I have amdgpu_bl0, just to mention
    – yano
    Feb 11, 2022 at 17:52

1 Answer 1

Reset to default
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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

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