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

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https://bugs.launchpad.net/bugs/1893568

Title:
  Screen brightness missing

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