Ben,I remember two years ago, it seemed like the backlight of this laptop could be adjusted. At that time, I installed Ubuntu on this laptop and there seemed to be a directory called "acpi_video" in the "/sys/class/backlight/" directory. However, at some point, this directory no longer existed. At that time, I was not very familiar with Linux distributions and didn't know how to report bugs.
Regards, larryw3i On 5/10/25 04:33, Ben Hutchings wrote:
Looking at what has changed in linux-next, this appears to be the fix: