Dell XPS 13 screen always on lowest dim with 3.8.0-30 kernel

[Sam Van den Eynde]

Since installing the latest kernel 3.8.0-30 on my Dell XPS 13, I can only use the screen on lowest dim/brightness. Hardware keys as well as System Settings have no effect on the dim level.

I already had issues with the brightness settings before. To make hardware keys and System Settings brightness settings work I added

echo 0 > /sys/class/backlight/intel_backlight/brightness

to /etc/rc.local and a custom /etc/pm/sleep.d/resume_brightness script.

Things tried
- remove "echo 0 > /sys/class/backlight/intel_backlight/brightness" from previously mentioned scripts
- add grub boot options "acpi_osi=Linux acpi_backlight=vendor acpi_osi='!Windows 2012'"

Workaround:

- keep utilizing "echo 0 > /sys/class/backlight/intel_backlight/brightness" in both scripts
- boot using the 3.8.0-29 kernel

This is a regression.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-signed-image-3.8.0-30-generic 3.8.0-30.44
ProcVersionSignature: Ubuntu 3.8.0-29.42-generic 3.8.13.5
Uname: Linux 3.8.0-29-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: amd64
Date: Sat Sep 7 18:09:08 2013
InstallationDate: Installed on 2013-03-28 (162 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130328)
MarkForUpload: True
SourcePackage: linux-signed
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Senno Kaasjager (st3vie)]

Problem still persists after updating kernel to 3.8.0-31. Workarounds mentioned in bug descriptions still needed.

[penalvch (penalvch)]

Sam VdE, thank you for reporting this bug to Ubuntu. Raring reached EOL on January 27, 2014.
See this document for currently supported Ubuntu releases: https://wiki.ubuntu.com/Releases

Is this an issue on a supported release? If so, please execute the following in a terminal:
apport-collect 1222197

[Sam Van den Eynde (samvde)]

Dear

As far as I'm concerned it is ok to close this bug. I indeed upgraded to 14.04 in the meantime.

Kind regards
Sam

[penalvch (penalvch)]

Sam VdE, this bug report is being closed due to your last comment https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1222197/comments/5 regarding this being fixed with an update. For future reference you can manage the status of your own bugs by clicking on the current status in the yellow line and then choosing a new status in the revealed drop down box. You can learn more about bug statuses at https://wiki.ubuntu.com/Bugs/Status. Thank you again for taking the time to report this bug and helping to make Ubuntu better. Please submit any future bugs you may find.