Even if there is a workaround that you should apply every time the screen
goes to standby, somebody should take into account the discovery Marcus
Rugger; it's really sad that the same people that deleted that line is not
able to make a diff to check the difference between latest 4-5 kernels with
the bug and the last one that was working.

It seems that they didn't believe it wasn't working even if there are tens
of report saying that last 4-5 versions are broken for XPS13 FullHD
"Sputnik" and other laptops... or even worst... it seems they don't care if
it's working or not.



2013/6/12 seanlano <email address hidden>

> The above workaround works for me, but only until I close the lid. When
> I open it again, I have to do the command again to fix the brightness
> adjustment.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1169376
>
> Title:
>   XPS13 backlight stopped working after update 3.8.0-18.28
>
> Status in Dell Sputnik:
>   Confirmed
> Status in “linux” package in Ubuntu:
>   Confirmed
>
> Bug description:
>   I'm on 13.04 beta 2 and I've been updating daily. After today's
>   update, I was asked to restart and, after the restart, the backlight
>   stopped working. What's worse is that the backlight is stuck in the
>   lowest possible setting. I can barely see enough to type out this bug
>   report. This is not a hardware problem. When I restart the computer
>   the backlight turns on property  but burns off when the Ubuntu
>   encryption screen comes up (I'm using full disk encryption). Please
>   fix this as soon as possible.
>
>   XPS 13 version: L322x
>   Display version: FHD (1080p)
>   ---
>   ApportVersion: 2.9.2-0ubuntu8
>   Architecture: amd64
>   AudioDevicesInUse:
>    USER        PID ACCESS COMMAND
>    /dev/snd/controlC0:  cr45h      1901 F.... pulseaudio
>   DistroRelease: Ubuntu 13.04
>   HibernationDevice: RESUME=UUID=a5d2ab8b-a068-4a69-95a6-b4e955b290f5
>   InstallationDate: Installed on 2013-04-08 (9 days ago)
>   InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64
> (20130402.1)
>   MachineType: Dell Inc. Dell System XPS L322X
>   MarkForUpload: True
>   Package: linux (not installed)
>   ProcEnviron:
>    TERM=xterm
>    PATH=(custom, no user)
>    XDG_RUNTIME_DIR=<set>
>    LANG=en_US.UTF-8
>    SHELL=/bin/bash
>   ProcFB: 0 inteldrmfb
>   ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-18-generic
> root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
>   ProcVersionSignature: Ubuntu 3.8.0-18.28-generic 3.8.6
>   RelatedPackageVersions:
>    linux-restricted-modules-3.8.0-18-generic N/A
>    linux-backports-modules-3.8.0-18-generic  N/A
>    linux-firmware                            1.105
>   Tags:  raring
>   Uname: Linux 3.8.0-18-generic x86_64
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
>   dmi.bios.date: 01/22/2013
>   dmi.bios.vendor: Dell Inc.
>   dmi.bios.version: A07
>   dmi.board.name: 0PJHXN
>   dmi.board.vendor: Dell Inc.
>   dmi.board.version: A00
>   dmi.chassis.type: 8
>   dmi.chassis.vendor: Dell Inc.
>   dmi.chassis.version: 0.1
>   dmi.modalias:
> dmi:bvnDellInc.:bvrA07:bd01/22/2013:svnDellInc.:pnDellSystemXPSL322X:pvr:rvnDellInc.:rn0PJHXN:rvrA00:cvnDellInc.:ct8:cvr0.1:
>   dmi.product.name: Dell System XPS L322X
>   dmi.sys.vendor: Dell Inc.
>
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>