You have been subscribed to a public bug:
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?
** Affects: linux-signed-oem-5.4 (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
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Backlight Brigthness not adjustable after install on Dell XPS 13 7390
https://bugs.launchpad.net/bugs/1871713
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which is subscribed to linux-signed-oem-5.4 in Ubuntu.
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