Hi,
I am using Debian Stretch 9.5 on an Acer Aspire E1-530 laptop.
Today the backlight brightness of my laptop monitor suddenly got much less
than 100%, I guess it was suddenly set to about 50% backlight brightness. A
reboot did not change this unwanted behaviour.
During every reboot the Grub splash screen was displayed with 100% backlight
brightness, and after that splash screen disappeared during the boot process,
these white output lines of the boot process on a black background were first
displayed with 100% backlight brightness, then they were displayed with much
less than 100% backlight brightness, I guess with about 50% backlight
brightness. Then the display manager got started, with a backlight brightness
much less than 100%, too.
To resolve this issue, I created a /etc/X11/xorg.conf file and inserted the
following lines in this file, more or less as suggested in message #5 of this
bug report (see above):
- - -
Section "Device"
Identifier "Card0"
Driver "intel"
Option "Backlight" "intel_backlight"
EndSection
- - -
Note that I do not use the line
BusID "PCI:0:2:0"
in the section "Device", as suggested in message #5 of this bug report (see
above), because I do not know how to find out the BusID of my monitor.
Then I rebooted my machine. The backlight brightness appeared to be still much
less than 100%. In the meantime I had installed the package xbacklight.
Then I applied
xbacklight -set 100
, and then the backlight brightness of my monitor was put to 100% again.
Note that the command "xbacklight -set 100" did not work before I created the
above-mentioned xorg.conf file with the content described above.
Regards,
Jens
