Ubuntu
linux package

  1. Bug #1862835
  2. Comment #8

Comment 8 for bug 1862835

Revision history for this message
Daniel van Vugt (vanvugt) wrote :

Legal values are 0 to whatever is in max_brightness

OK, the next step is to double check there exists no other

  /sys/class/backlight/*

directory. Just in case you have multiple backlight devices, which is not uncommon.

Regardless, I think we are at the stage where it can be said to be a kernel bug. Are you able to identify an older kernel version which doesn't have the bug? Or even if you boot 19.10 from USB?