Ubuntu
linux package

  1. Bug #1821882
  2. Comment #2

Comment 2 for bug 1821882

Revision history for this message
Pierre Equoy (pieq) wrote :

I tried the same while blacklisting nouveau driver in grub:

$ cat /proc/cmdline
BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash modprobe.blacklist=nouveau ---

This time, I have "acpi_video0" in /sys/class/backlight, but the result is the same. The screen is very dark.

/sys/class/backlight/acpi_video0/brightness is 100 by default. I can modify this value with

$ sudo su
# echo 60 > /sys/class/backlight/acpi_video0/brightness

and the brightness actually changes to something even darker. If I try to set it over 100, I get:

write error: Invalid argument