Hi,
I'm trying to change screen brightness on Debian buster non-free live ISO running on an "Acer Aspire Switch 10" with "Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx" iGPU using i915 driver.
/sys/class/backlight/ contains directories acpi_video0 through acpi_video7. I tried changing the value in the brightness file in each of those directories, but the screen brightness didn't change.
I tried booting with acpi_backlight=video, acpi_backlight=vendor, acpi_backlight=none, i915.enable_dpcd_backlight=1 kernel parameters, but none of them worked (some of them actually caused /sys/class/backlight/ to be empty).
How can I make it work?
Thanks!
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