Comment 27 for bug 1861925

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Demyan Yarmoshik (niquepolice) wrote :

I have Lenovo 15ARH05 with Ryzen 7 4800h and the same problem as in bug description. In Fedora 32 with kernel 5.6.6-300 backlight control is fine, even though actual_brightness changes from 514 to 65536. But there is another bug in this kernel, so I updated to 5.8.4-200 and backlight control doesnt work here, actual_brightness just stuck at 311.
Checked v5.9-rc4, the only change I noticed is that brightness value restores after reboot if kernel parameter acpi_backlight=vendor is set (but the screen is at its full brightness anyway).