I encounter a brightness issue on a newly installed trisquel7.0, my stats:
uname -a
Linux a-X200MA 3.13.0-110-lowlatency #157+7.0trisquel2 SMP PREEMPT Wed Feb 22
18:10:01 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
Attempt 01:
/etc/default/grub
change the line:
#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomdmonddf nomdmonisw"
to:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
sudo update-grub2
sudo reboot
{fail}
Attempt 02:
xbacklight -dec 10
{fail}
Attempt 03:
xrandr
not installed and
sudo apt-get install -y xrandr
only yields
Package xrandr is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
x11-xserver-utils:i386 x11-xserver-utils
{fail}
With my amd64 architecture it is kind of strange that "x11-xserver-utils:i386
x11-xserver-utils" would be suggested by the system.
Attempt 04:
sudo apt-get install -y x11-xserver-utils
Unpacking x11-xserver-utils (7.7+2ubuntu1) ...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
Setting up x11-xserver-utils (7.7+2ubuntu1) ...
a@a-X200MA:/usr/local/bin$ x11-xserver-utilsbash: x11-xserver-utils: command
not found
Attempt05:
sudo sed "s/\(GRUB_CMDLINE_LINUX=\)\"\"/\1\"acpi_osi=Linux
acpi_backlight=vendor\"/" /etc/default/grub -i && sudo update-grub
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is
set is no longer supported.
sudo update-grub2
sudo reboot
