Public bug reported:
On both versions of the XPS 13 (L322X and L321X) running Ubuntu Raring with the
latest 3.8 kernel, letting the screen turn off and then back on causes the
backlight to go to maximum brightness and become not adjustable. This behavior
is not seen with suspend/resume or at boot (such as with LP #954661). I have
verified this behavior on two systems. The backlight behaved correctly on both
with Precise running Kamal's special kernel build.
---
ApportVersion: 2.9.2-0ubuntu5
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path',
'/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/hwC0D3',
'/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D3p', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
DistributionChannelDescriptor:
# This is a distribution channel descriptor
# For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
canonical-oem-somerville-precise-amd64-20120703-2
DistroRelease: Ubuntu 13.04
HibernationDevice: RESUME=UUID=2827209a-01af-48d1-82e8-472354ab65a7
InstallationDate: Installed on 2013-03-26 (3 days ago)
InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary
20120703-15:08
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=/boot/vmlinuz-3.8.0-15-generic
root=UUID=5c924dca-ecf4-4d3d-a7d2-34780269b9c5 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.8.0-15.25-generic 3.8.4
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-3.8.0-15-generic N/A
linux-backports-modules-3.8.0-15-generic N/A
linux-firmware 1.104
Tags: raring
Uname: Linux 3.8.0-15-generic x86_64
UpgradeStatus: Upgraded to raring on 2013-03-29 (0 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 02/21/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: B40
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias:
dmi:bvnDellInc.:bvrB40:bd02/21/2013:svnDellInc.:pnDellSystemXPSL322X:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: Dell System XPS L322X
dmi.sys.vendor: Dell Inc.
** Affects: dell-sputnik
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-collected raring
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1162026
Title:
backlight not adjustable after screen turns off and then back on
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