Comment 81 for bug 1169376

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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>