[root@Pixel4 defaultuser]# ls -l /sys/class/backlight/panel0-backlight/
total 0
-r--r--r--    1 root     root          4096 Feb 16 05:49 actual_brightness
-rw-r--r--    1 root     root          4096 Feb 16 05:49 alpm_mode
-rw-r--r--    1 root     root          4096 Feb 16 05:49 bl_power
-rw-r--r--    1 root     root          4096 Feb 16 05:32 brightness
lrwxrwxrwx    1 root     root             0 Feb 16 05:49 device -> ../../../soc:qcom,dsi-display-primary
-rw-r--r--    1 root     root          4096 Feb 16 05:49 hbm_mode
-rw-r--r--    1 root     root          4096 Feb 16 05:49 hbm_sv_enabled
-r--r--r--    1 root     root          4096 Feb 16 05:32 max_brightness
drwxr-xr-x    2 root     root             0 Feb 16 05:49 power
lrwxrwxrwx    1 root     root             0 Feb 16 05:31 subsystem -> ../../../../../../class/backlight
-r--r--r--    1 root     root          4096 Feb 16 05:49 type
-rw-r--r--    1 root     root          4096 Feb 16 05:31 uevent
-rw-r--r--    1 root     root          4096 Feb 16 05:49 vr_mode