kernel-packages team mailing list archive

[James Cobban <webmaster@xxxxxxxxxxxxxxx>]

On a reboot the backlight is turned on very early in the process, before
the driver is loaded, probably by the bios.  This is obvious because
grub is able to display, so on a reboot the driver does not have to turn
on the backlight, it is already on, whereas on a resume the backlight
needs to be explicitly turned on by the operating system since the bios
is only involved to the extent of signalling the ACPI state.  However
even if there is a bug in the bios with respect to supporting whatever
mechanism the driver is attempting to use to manage the hardware display
state, on Ubuntu 13 and earlier the display was occasionally turned on
by resume, whereas now it is never turned on.

Please tell me what I have to do to resolve the "incomplete" status of
this problem.

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https://bugs.launchpad.net/bugs/1392460

Title:
  resume hang ubuntu 14.10 kernel 3.16

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Since upgrading to 14.10 every time I open the laptop lid the system
  hangs after enabling the keyboard but before turning on the display.
  That is the backlight on the LED screen is not turned on.  This issue
  has occurred occasionally since 12.4, but is now completely
  consistent.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-24-generic 3.16.0-24.32
  ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
  Uname: Linux 3.16.0-24-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  jcobban    3455 F.... pulseaudio
   /dev/snd/controlC0:  jcobban    3455 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Nov 13 14:51:39 2014
  HibernationDevice: RESUME=UUID=e1d460c4-e29e-470e-a302-7891166d98f7
  MachineType: Dell Inc. Vostro 3555
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-24-generic root=UUID=5850bfca-8269-4a92-8fda-798e6557b0bd ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-24-generic N/A
   linux-backports-modules-3.16.0-24-generic  N/A
   linux-firmware                             1.138
  SourcePackage: linux
  UpgradeStatus: Upgraded to utopic on 2014-11-12 (1 days ago)
  WifiSyslog: Nov 13 14:34:15 jcobban-laptop kernel: [ 1205.903943] systemd-hostnamed[4497]: Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!
  dmi.bios.date: 10/24/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A04
  dmi.board.name: 0K89MF
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A04
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA04:bd10/24/2011:svnDellInc.:pnVostro3555:pvrNotSpecified:rvnDellInc.:rn0K89MF:rvrA04:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Vostro 3555
  dmi.product.version: Not Specified
  dmi.sys.vendor: Dell Inc.

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