*** This bug is a duplicate of bug 1871330 ***
https://bugs.launchpad.net/bugs/1871330
This is still a duplicate of bug 1871330. The typo was actually in that
other bug.
** This bug has been marked a duplicate of bug 1871330
Dell XPS 13 (7390) brightness is not adjustable with recent kernel update
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Packages, which is subscribed to linux-signed-oem-5.4 in Ubuntu.
https://bugs.launchpad.net/bugs/1871713
Title:
Backlight Brigthness not adjustable after install on Dell XPS 13 7390
Status in linux-signed-oem-5.4 package in Ubuntu:
New
Bug description:
The Ubuntu 20.04 beta installer/live system does allow to adjust the
screen brightness via the control commands and the interface at
echo $value /sys/class/backlight/intel_backlight/brightness
The action in the installer/live system does change the brightness
appropriately. After performing the default install, most values for
brightness does not reflect to actual_brightness.
Example:
echo 1 > /sys/class/backlight/intel_backlight/brightness
echo `cat /sys/class/backlight/intel_backlight/max_brightness` >
/sys/class/backlight/intel_backlight/brightness
does not produce a difference. However, it does work in the live
system/installier.
The only difference after installation does happen on the following
command:
echo 0 > /sys/class/backlight/intel_backlight/brightness\\
which turns off the display.
Is there any information that I can provide to debug this issue
further?
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