Comment 3 for bug 1893568

corrado@corrado-n3-gg-0826:~$ ls /sys/class/backlight/
intel_backlight
corrado@corrado-n3-gg-0826:~$ cd intel_backlight
bash: cd: intel_backlight: No such file or directory
corrado@corrado-n3-gg-0826:~$ cd /sys/class/backlight/
corrado@corrado-n3-gg-0826:/sys/class/backlight$ ls
intel_backlight
corrado@corrado-n3-gg-0826:/sys/class/backlight$ cd intel_backlight
corrado@corrado-n3-gg-0826:/sys/class/backlight/intel_backlight$ ls
actual_brightness bl_power brightness device max_brightness power scale subsystem type uevent
corrado@corrado-n3-gg-0826:/sys/class/backlight/intel_backlight$ inxi -SCGx
System: Host: corrado-n3-gg-0826 Kernel: 5.4.0-42-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 Desktop: N/A
           Distro: Ubuntu 20.10 (Groovy Gorilla)
CPU: Info: Quad Core model: Intel Core i5-1035G1 bits: 64 type: MT MCP arch: Ice Lake rev: 5 L2 cache: 6144 KiB
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 19046
           Speed: 555 MHz min/max: 400/3600 MHz Core speeds (MHz): 1: 1029 2: 1851 3: 1482 4: 3015 5: 1953 6: 1549 7: 2231
           8: 3061
Graphics: Device-1: Intel Iris Plus Graphics G1 vendor: Dell driver: i915 v: kernel bus ID: 00:02.0
           Device-2: Realtek Integrated_Webcam_HD type: USB driver: uvcvideo bus ID: 1-6:3
           Display: x11 server: X.Org 1.20.8 driver: modesetting unloaded: fbdev,vesa resolution: 1920x1080~60Hz
           OpenGL: renderer: Mesa Intel UHD Graphics (ICL GT1) v: 4.6 Mesa 20.1.5 direct render: Yes
corrado@corrado-n3-gg-0826:/sys/class/backlight/intel_backlight$

thanks, let me know if this info is sufficient