*** This bug is a duplicate of bug 1871330 ***
https://bugs.launchpad.net/bugs/1871330
Thank you for taking the time to report this bug and helping to make
Ubuntu better. This particular bug has already been reported and is a
duplicate of bug 1871330, so it is being marked as such. Please look at
the other bug report to see if there is any missing information that you
can provide, or to see if there is a workaround for the bug.
Additionally, any further discussion regarding the bug should occur in
the other report. Feel free to continue to report any other bugs you may
find.
** This bug has been marked a duplicate of bug 1871330
Dell XPS 13 (9370) brightness is not adjustable with recent kernel update
** Summary changed:
- Backlight Brigthness not adjustable after install on Dell XPS 13 7390
+ Backlight Brigthness not adjustable after install on Dell XPS 13 9370
--
You received this bug notification because you are a member of Kernel
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?
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-signed-oem-5.4/+bug/1871713/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
