kernel-packages team mailing list archive

[Kent Baxley <1169376@xxxxxxxxxxxxxxxxxx>]

@Francisco and others,

Please check here for the latest status on what's going on upstream:

https://bugzilla.kernel.org/show_bug.cgi?id=47941

Some users have popped out of the woodwork to declare that the most recent patches that went in  *breaks* the backlight completely (black screen on boot) for one particular XPS13 configuration:  IvyBridge with UEFI enabled
along with Legacy BIOS enabled.  (Those same users also say that backlight control *always* worked for them, even without _any_ patch).

To complicate things further, a couple of other users with the same UEFI
+Legacy configuration say the exact opposite:  That the quirk patch
fixes their never-before-working backlight control (same as for all the
other non-UEFI users).

If anyone with an affected machine is willing to pitch in and help with
the latest patches being worked on please do so.

-- 
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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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