https://bugzilla.kernel.org/show_bug.cgi?id=207833

Bug ID: 207833 Summary: Brightness control not working on ASUS TUF FA506IU (AMD Ryzen 7 4800H / Nvidia GTX 1660 Ti) Product: Drivers Version: 2.5 Kernel Version: 5.6.12-1 Hardware: x86-64 OS: Linux Tree: Mainline Status: NEW Severity: high Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: julen.pardo@outlook.es Regression: No

Hello,

I've just bought an ASUS TUF FA506IU with and AMD Ryzen 7 4800H / Nvidia GTX 1660 Ti setup. Even if this is quite new hardware, I'd say that the only thing that is not working at all is the brightness control. It's not working with the function keys, nor from the energy settings, nor with xbacklight.

Actually, it's working a little; I can find a subtle difference between the max value and the last 5 values, but that's it. Setting it to the minimum still makes it way too bright.

I've noticed that this could be a range mismatch between "brightness" and "max_brightness", and "actual_brightness". First are in 8 bit ranges, whereas the actual brightness is in 16 bit range. I've tried some luck patching the kernel to return an 8-bit value (https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/amd/display/dc...), but doing just that doesn't work (even if the "actual_brightness" was showing an 8 bit value). In my case, the full path is "/sys/class/backlight/amdgpu_bl1/".

I've also tried different acpi_backlight parameters with no luck.

I leave the output of lsmod | grep asus:

asus_wmi 40960 0 sparse_keymap 16384 1 asus_wmi rfkill 28672 9 asus_wmi,bluetooth,cfg80211 battery 24576 1 asus_wmi wmi 36864 2 asus_wmi,wmi_bmof asus_wireless 20480 0

inxi -F:

System: Host: TUF-FA506IU Kernel: 5.6.12-1-MANJARO x86_64 bits: 64 Desktop: KDE Plasma 5.18.5 Distro: Manjaro Linux Machine: Type: Laptop System: ASUSTeK product: TUF Gaming FA506IU_FA506IU v: 1.0 serial: <root required> Mobo: ASUSTeK model: FA506IU v: 1.0 serial: <root required> UEFI: American Megatrends v: FA506IU.302 date: 03/04/2020 Battery: ID-1: BAT1 charge: 47.9 Wh condition: 47.9/48.1 Wh (100%) CPU: Topology: 8-Core model: AMD Ryzen 7 4800H with Radeon Graphics bits: 64 type: MT MCP L2 cache: 4096 KiB Speed: 2405 MHz min/max: 1400/2900 MHz Core speeds (MHz): 1: 1875 2: 2497 3: 1397 4: 1397 5: 1397 6: 1397 7: 1397 8: 1397 9: 1397 10: 1396 11: 2963 12: 1673 13: 1800 14: 1548 15: 1397 16: 1396 Graphics: Device-1: NVIDIA TU116M [GeForce GTX 1660 Ti Mobile] driver: nvidia v: 440.82 Device-2: Advanced Micro Devices [AMD/ATI] Renoir driver: amdgpu v: kernel Display: x11 server: X.Org 1.20.8 driver: amdgpu,nvidia resolution: 1920x1080~144Hz, 2560x1440~60Hz OpenGL: renderer: AMD RENOIR (DRM 3.36.0 5.6.12-1-MANJARO LLVM 10.0.0) v: 4.6 Mesa 20.0.6 Audio: Device-1: NVIDIA TU116 High Definition Audio driver: snd_hda_intel Device-2: Advanced Micro Devices [AMD/ATI] driver: snd_hda_intel Device-3: Advanced Micro Devices [AMD] Raven/Raven2/FireFlight/Renoir Audio Processor driver: N/A Device-4: Advanced Micro Devices [AMD] Family 17h HD Audio driver: snd_hda_intel Sound Server: ALSA v: k5.6.12-1-MANJARO Network: Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8169 IF: enp2s0 state: down mac: a8:5e:45:36:94:32 Device-2: Realtek RTL8822CE 802.11ac PCIe Wireless Network Adapter driver: rtw_pci IF: wlp3s0 state: up mac: 70:66:55:09:8c:e3 Drives: Local Storage: total: 476.94 GiB used: 32.41 GiB (6.8%) ID-1: /dev/nvme0n1 vendor: Kingston model: OM8PCP3512F-AB size: 476.94 GiB Partition: ID-1: / size: 48.97 GiB used: 25.95 GiB (53.0%) fs: ext4 dev: /dev/nvme0n1p5 ID-2: /home size: 108.67 GiB used: 6.46 GiB (5.9%) fs: ext4 dev: /dev/nvme0n1p7 ID-3: swap-1 size: 3.03 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/nvme0n1p8 Sensors: Message: No sensors data was found. Is sensors configured? Info: Processes: 349 Uptime: 27m Memory: 7.20 GiB used: 3.04 GiB (42.2%) Shell: zsh inxi: 3.0.37