Public bug reported:
Pressing Fn + Brightness Up and Down results in the brightness indicator
jumping randomly up and down, with no change to the actual brightness.
This laptop uses a nvidia graphics card for display and brightness which
is not supported by ubuntu's default configuration.
There is only one way that I have found to actually make the brightness go up
and down:
1. Add acpi_osi=Linux acpi_backlight=vendor ro to /boot/grub/grub.cfg
2. Type echo 5 > /sys/class/backlight/nv_backlight/brightness
And even with acpi_backlight=vendor switched on, using the Fn key to
affect brightness still does not work, presumably because its trying to
use dell_backlight, which does nothing.
Output of ls /sys/class/backlight with acpi_backlight=vendor:
root@r-Inspiron-1370:~# ls /sys/class/backlight
dell_backlight nv_backlight
root@r-Inspiron-1370:~#
Normally this only contains acpi_video0 (off top of head so might be a
typo). I think someone needs to make a patch to fix this bug.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/994697
Title:
Dell 1370 brightness not working,
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