http://bugzilla.opensuse.org/show_bug.cgi?id=1180749 Bug ID: 1180749 Summary: AMD Ryzen 4800H Integrated Graphics brightness control not working as found in some Lenovo Legion 5 15ARH05 Classification: openSUSE Product: openSUSE Tumbleweed Version: Current Hardware: x86-64 OS: openSUSE Tumbleweed Status: NEW Severity: Normal Priority: P5 - None Component: Kernel Assignee: kernel-bugs@opensuse.org Reporter: antonyjr000@gmail.com QA Contact: qa-bugs@suse.de Found By: --- Blocker: --- When using switchable graphics in Lenovo Legion 5 15ARH05, the AMD Renoir APU works along with NVIDIA Graphics(even non-free and prime works) but the brightness cannot be controlled by the Fn keys, Software or /sys/class/backlight I've tried setting all the kernel params like acpi_backlight=vender or native but the brightness control still does not work. I highly suspect it's a bug in the amdgpu kernel driver. For now nvidia graphics card works with brightness control. It is also worthy to note that cat /sys/class/backlight/*/actual_brightness always returns 311 and does not change even when executed echo 50 > /sys/class/backlight/*/brightness There are number of reports on this issue over the internet but nothing official. I've tried a lot of linux distros and none of them work and it seems it is broken even in the mainline kernel. I've also tried Kernel:HEAD version of the kernel without the nvidia graphics support but still the brightness control does not work. At the time writing I've booted linux 5.11-rc2 but the brightness control still does not work. -- You are receiving this mail because: You are the assignee for the bug.