http://bugzilla.opensuse.org/show_bug.cgi?id=1186896 Bug ID: 1186896 Summary: AMD Rhyzen 7 4700H Renoir: brightness + ext screen don't work Classification: openSUSE Product: openSUSE Distribution Version: Leap 15.2 Hardware: Other OS: Other Status: NEW Severity: Normal Priority: P5 - None Component: Kernel Assignee: kernel-bugs@opensuse.org Reporter: opensuse@pohw.nl QA Contact: qa-bugs@suse.de Found By: --- Blocker: --- ** Platform Info ** Distribution: Leap 15.2 Kernel: 5.3.18-lp152.75-default CPU: Rhyzen 7 4700U Graphics: # lspci -nnk | grep -A3 VGA 05:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Renoir [1002:1636] (rev c2) Subsystem: CLEVO/KAPOK Computer Device [1558:a500] Symptom: Changing the brightness of the laptop screen doesn't work. Turning the scroll wheel over de battery icon in the system tray does't do anything. No change in brightness. But I do get the mmediate and unexplainable popup of the external monitor widget (see attachment). Peculiarly, the settings are correctly registered. Before: rietgors:/sys/devices/pci0000:00/0000:00:08.1/0000:05:00.0/backlight/acpi_video0 # cat actual_brightness max_brightness 21 49 After: rietgors:/sys/devices/pci0000:00/0000:00:08.1/0000:05:00.0/backlight/acpi_video0 # cat actual_brightness max_brightness 36 49 Exactly the same happens when I directly echo values in the "brightness" device from the command line. No change in brightness and immediate popup of the external monitor widget. Some information you might find useful: xlgears: Accellaratioin seems to work normally. xlgears gives me > 3200 fps. xgamma: value changes are properly registered: koos@rietgors:~> xgamma -rgamma 0.2 -ggamma 0.4 -bgamma 0.6 -> Red 1.000, Green 1.000, Blue 1.000 <- Red 0.200, Green 0.400, Blue 0.600 However no change in color whatsoever. xbacklight: Doesn't work. koos@rietgors:~> xbacklight -get No outputs have backlight property Next to the default Leap 15.2 kernel, I've tried the following kernels: - kernel-default-5.13.rc3/rc4 from KOTD - kernel-default-5.12.9 from the Kernel Stable repo However those kernels don't work at all. They hang hard during the boot process. If I select the Fail Safe option from the boot menu, they both hang at the following location in the boot screen (typed over from photo, see attachment): [drm] amdgpu kernel modesetting enabled. Virtual CRAT table created for CPU amdgpu: Topology: Add CPU node fb0: switching to amdgpudrmfb from EFI VGA -- You are receiving this mail because: You are the assignee for the bug.