Screen brightness does'nt works at DELL G15 5515

Hi guys, i am facing problems with the screen brightness there is no way to modify it. t the brightnessctl updates the configuration files /sys/class/backlight/nvidia_wmi_ec_backlight or /sys/class/backlight/amdgpu_bl0 using the --device option, but neither of those change the brightness of the screen.
I install the system with propertary nvidia drivers option.

System:
Kernel: 6.0.6-zen1-1-zen arch: x86_64 bits: 64 compiler: gcc v: 12.2.0
parameters: BOOT_IMAGE=/@/boot/vmlinuz-linux-zen
root=UUID=19994518-61ed-4299-a1f8-e0e44b535ae3 rw [email protected]
quiet quiet splash acpi_backlight=native snd_hda_intel.dmic_detect=0
rd.udev.log_priority=3 vt.global_cursor_default=0 loglevel=3
Desktop: KDE Plasma v: 5.26.2 tk: Qt v: 5.15.7 info: latte-dock
wm: kwin_x11 vt: 1 dm: SDDM Distro: Garuda Linux base: Arch Linux
Machine:
Type: Laptop System: Dell product: Dell G15 5515 v: 1.6.0
serial: <superuser required> Chassis: type: 10 v: 1.6.0
serial: <superuser required>
Mobo: Dell model: 0R3CDX v: A00 serial: <superuser required> UEFI: Dell
v: 1.6.0 date: 03/14/2022
Battery:
ID-1: BAT1 charge: 56.4 Wh (88.1%) condition: 64.0/86.0 Wh (74.4%)
volts: 12.7 min: 11.4 model: BYD 0x48,0x31,0x35,0x41,0x69,0x03,0x0002
type: Li-ion serial: <filter> status: charging
CPU:
Info: model: AMD Ryzen 7 5800H with Radeon Graphics bits: 64 type: MT MCP
arch: Zen 3 gen: 4 level: v3 note: check built: 2021-22 process: TSMC n7
(7nm) family: 0x19 (25) model-id: 0x50 (80) stepping: 0
microcode: 0xA50000C
Topology: cpus: 1x cores: 8 tpc: 2 threads: 16 smt: enabled cache:
L1: 512 KiB desc: d-8x32 KiB; i-8x32 KiB L2: 4 MiB desc: 8x512 KiB
L3: 16 MiB desc: 1x16 MiB
Speed (MHz): avg: 1449 high: 3200 min/max: 1200/4462 boost: enabled
scaling: driver: acpi-cpufreq governor: schedutil cores: 1: 1200 2: 1197
3: 1198 4: 1198 5: 1200 6: 3200 7: 1200 8: 1200 9: 1200 10: 1200 11: 1198
12: 1200 13: 1200 14: 1198 15: 1200 16: 3200 bogomips: 102210
Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
Vulnerabilities:
Type: itlb_multihit status: Not affected
Type: l1tf status: Not affected
Type: mds status: Not affected
Type: meltdown status: Not affected
Type: mmio_stale_data status: Not affected
Type: retbleed status: Not affected
Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via
prctl
Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer
sanitization
Type: spectre_v2 mitigation: Retpolines, IBPB: conditional, IBRS_FW,
STIBP: always-on, RSB filling, PBRSB-eIBRS: Not affected
Type: srbds status: Not affected
Type: tsx_async_abort status: Not affected
Graphics:
Device-1: NVIDIA GA107M [GeForce RTX 3050 Ti Mobile] vendor: Dell
driver: nvidia v: 520.56.06 alternate: nouveau,nvidia_drm non-free: 515.xx+
status: current (as of 2022-10) arch: Ampere code: GAxxx process: TSMC n7
(7nm) built: 2020-22 pcie: gen: 3 speed: 8 GT/s lanes: 8 link-max: gen: 4
speed: 16 GT/s lanes: 16 bus-ID: 01:00.0 chip-ID: 10de:25a0
class-ID: 0300
Device-2: AMD Cezanne vendor: Dell driver: amdgpu v: kernel arch: GCN-5.1
code: Vega-2 process: TSMC n7 (7nm) built: 2018-21 pcie: gen: 3
speed: 8 GT/s lanes: 16 link-max: gen: 4 speed: 16 GT/s ports:
active: eDP-1 empty: DP-1 bus-ID: 05:00.0 chip-ID: 1002:1638
class-ID: 0300 temp: 54.0 C
Device-3: Microdia Integrated_Webcam_HD type: USB driver: uvcvideo
bus-ID: 1-4:3 chip-ID: 0c45:6a09 class-ID: 0e02
Display: x11 server: X.Org v: 21.1.4 with: Xwayland v: 22.1.4
compositor: kwin_x11 driver: X: loaded: amdgpu,nvidia
unloaded: modesetting,nouveau alternate: fbdev,nv,vesa dri: radeonsi
gpu: amdgpu display-ID: :0 screens: 1
Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.00x11.22")
s-diag: 582mm (22.93")
Monitor-1: eDP-1 mapped: eDP model: BOE Display 0x092a built: 2020
res: 1920x1080 hz: 120 dpi: 142 gamma: 1.2 size: 344x194mm (13.54x7.64")
diag: 395mm (15.5") ratio: 16:9 modes: max: 1920x1080 min: 640x480
OpenGL: renderer: RENOIR (renoir LLVM 14.0.6 DRM 3.48 6.0.6-zen1-1-zen)
v: 4.6 Mesa 22.2.1 direct render: Yes
Audio:
Device-1: NVIDIA vendor: Dell driver: snd_hda_intel v: kernel pcie: gen: 3
speed: 8 GT/s lanes: 8 link-max: gen: 4 speed: 16 GT/s lanes: 16
bus-ID: 01:00.1 chip-ID: 10de:2291 class-ID: 0403
Device-2: AMD Renoir Radeon High Definition Audio vendor: Dell
driver: snd_hda_intel v: kernel pcie: gen: 3 speed: 8 GT/s lanes: 16
link-max: gen: 4 speed: 16 GT/s bus-ID: 05:00.1 chip-ID: 1002:1637
class-ID: 0403
Device-3: AMD ACP/ACP3X/ACP6x Audio Coprocessor vendor: Dell
driver: snd_rn_pci_acp3x v: kernel
alternate: snd_pci_acp3x,snd_pci_acp5x,snd_pci_acp6x,snd_acp_pci,snd_rpl_pci_acp6x,snd_sof_amd_renoir
pcie: gen: 3 speed: 8 GT/s lanes: 16 link-max: gen: 4 speed: 16 GT/s
bus-ID: 05:00.5 chip-ID: 1022:15e2 class-ID: 0480
Device-4: AMD Family 17h/19h HD Audio vendor: Dell driver: snd_hda_intel
v: kernel pcie: gen: 3 speed: 8 GT/s lanes: 16 link-max: gen: 4
speed: 16 GT/s bus-ID: 05:00.6 chip-ID: 1022:15e3 class-ID: 0403
Sound API: ALSA v: k6.0.6-zen1-1-zen running: yes
Sound Server-1: PulseAudio v: 16.1 running: no
Sound Server-2: PipeWire v: 0.3.59 running: yes
Network:
Device-1: Realtek RTL8125 2.5GbE vendor: Dell driver: r8169 v: kernel pcie:
gen: 2 speed: 5 GT/s lanes: 1 port: 2000 bus-ID: 03:00.0 chip-ID: 10ec:8125
class-ID: 0200
IF: enp3s0 state: down mac: <filter>
Device-2: Intel Wi-Fi 6 AX200 vendor: Rivet Networks Killer™
driver: iwlwifi v: kernel pcie: gen: 2 speed: 5 GT/s lanes: 1
bus-ID: 04:00.0 chip-ID: 8086:2723 class-ID: 0280
IF: wlp4s0 state: up mac: <filter>
Bluetooth:
Device-1: Intel AX200 Bluetooth type: USB driver: btusb v: 0.8
bus-ID: 1-3:2 chip-ID: 8087:0029 class-ID: e001
Report: bt-adapter ID: hci0 rfk-id: 0 state: up address: <filter>
Drives:
Local Storage: total: 931.51 GiB used: 11.73 GiB (1.3%)
SMART Message: Unable to run smartctl. Root privileges required.
ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Mushkin model: MKNSSDHL1TB-D8
size: 931.51 GiB block-size: physical: 512 B logical: 512 B
speed: 31.6 Gb/s lanes: 4 type: SSD serial: <filter> rev: T0709E0L
temp: 45.9 C scheme: GPT
Partition:
ID-1: / raw-size: 195.31 GiB size: 195.31 GiB (100.00%) used: 11.68 GiB
(6.0%) fs: btrfs dev: /dev/nvme0n1p6 maj-min: 259:6
ID-2: /boot/efi raw-size: 100 MiB size: 96 MiB (96.00%) used: 48.2 MiB
(50.3%) fs: vfat dev: /dev/nvme0n1p2 maj-min: 259:2
ID-3: /home raw-size: 195.31 GiB size: 195.31 GiB (100.00%) used: 11.68
GiB (6.0%) fs: btrfs dev: /dev/nvme0n1p6 maj-min: 259:6
ID-4: /var/log raw-size: 195.31 GiB size: 195.31 GiB (100.00%) used: 11.68
GiB (6.0%) fs: btrfs dev: /dev/nvme0n1p6 maj-min: 259:6
ID-5: /var/tmp raw-size: 195.31 GiB size: 195.31 GiB (100.00%) used: 11.68
GiB (6.0%) fs: btrfs dev: /dev/nvme0n1p6 maj-min: 259:6
Swap:
Kernel: swappiness: 133 (default 60) cache-pressure: 100 (default)
ID-1: swap-1 type: zram size: 14.98 GiB used: 0 KiB (0.0%) priority: 100
dev: /dev/zram0
Sensors:
System Temperatures: cpu: 63.2 C mobo: N/A gpu: amdgpu temp: 55.0 C
Fan Speeds (RPM): N/A
Info:
Processes: 385 Uptime: 48m wakeups: 3654 Memory: 14.98 GiB used: 5.24 GiB
(35.0%) Init: systemd v: 251 default: graphical tool: systemctl
Compilers: gcc: 12.2.0 Packages: pm: pacman pkgs: 1235 libs: 316
tools: octopi,paru Shell: fish v: 3.5.1 default: Bash v: 5.1.16
running-in: konsole inxi: 3.3.22
Garuda (2.6.9-1):
System install date:     2022-10-30
Last full system update: 2022-11-01 ↻
Is partially upgraded:   No
Relevant software:       NetworkManager
Windows dual boot:       Probably (Run as root to verify)
Snapshots:               Snapper
Failed units:

Looks like this open kernel bug
https://bugzilla.kernel.org/show_bug.cgi?id=216138
Although they say that without hybrid mode nvidia-settings should work, but according to the Wiki this seems to be acting only on colors, not backlight
https://wiki.archlinux.org/title/Backlight#NVIDIA_settings

4 Likes

i can change the colors using xrandr, which kernel should i use to fix it? i'm not into that world yet. i use popOS and i have the same problem, usign ubuntu 20.04 or debian work just fine.

The kernel bug is still open, so it doesn't make sense to try the newest releases, but it was reported on 5.17, so you could try installing linux-lts, which has 5.15.

sudo pacman -Syu linux-lts linux-lts-headers

But most likely this is not a "regression" problem, but it's due to your Hw, which I think is new, so probably you'll just have to wait for a fix. Try the lts, anyway...

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