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[Michael Steffens <michael_steffens@xxxxxxxxx>]

Exceuted the tracing steps suggested in
https://wiki.ubuntu.com/DebuggingKernelSuspend using the latest mainline
kernel

# uname -r
3.19.0-031900-generic

and everything worked as expected. The suspend state was entered seconds
after running

# sync && echo 1 > /sys/power/pm_trace && pm-suspend

and the notebook resumed within seconds after pushing the power button.
As usual the display returned fully dimmed and all controls to alter
display brightness have no effect any more.

/proc/acpi/wakeup has not changed between suspend and resume. The RTC is
skewed by nearly 21 years

# hwclock --show
Thu 19 Apr 1984 06:00:15 PM CEST  -0.485252 seconds

indicating that some tracing information were put there. However, I can
find only find one pair of

[    1.981094]   Magic number: 3:558:892
[    1.981174] bdi default: hash matches

which was already included in dmesg before suspend, and doesn't quite
match the pattern of what to watch out for. I am attaching dmesg output
both gathered before and after suspend/resume.


** Attachment added: "resume-trace.tar.gz"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1390764/+attachment/4324814/+files/resume-trace.tar.gz

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1390764

Title:
  Display remains fully dimmed after resume from suspend

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After resuming from suspend the display returns fully dimmed, and
  display brightness can't be adjusted, neither using FN keys, nor using
  KDE power management control. The issue occurs regardless whether the
  suspend state was activated by low battery, by closing the display, or
  by explicitly selecting sleep mode in KDE. Killing and restarting  X
  does not solve the problem. A reboot does.

  ---
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: michael 2554 F.... pulseaudio michael 2784 F.... pulseaudio CRDA: Error: [Errno 2] No such file or directory
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=8dc81a6f-65e9-443d-b850-0f62a1ca52c4 InstallationDate: Installed on 2012-05-13 (909 days ago)
  InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120424)
  MachineType: Hewlett-Packard HP EliteBook 8530w
  Package: linux (not installed)
  PccardctlStatus: Socket 0: 3.3V 16-bit PC Card Subdevice 0 (function 0) bound to driver "pata_pcmcia"
  ProcEnviron: LANGUAGE=en_US:en TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-39-generic root=/dev/mapper/vg00-lv_root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. 
  RelatedPackageVersions: linux-restricted-modules-3.13.0-39-generic N/A linux-backports-modules-3.13.0-39-generic N/A linux-firmware 1.127.7
  Tags: trusty
  Uname: Linux 3.13.0-39-generic x86_64
  UpgradeStatus: Upgraded to trusty on 2014-05-10 (181 days ago)
  UserGroups: _MarkForUpload: True
  dmi.bios.date: 06/24/2009
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68PDV Ver. F.0C
  dmi.board.name: 30E7
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 90.23
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68PDVVer.F.0C:bd06/24/2009:svnHewlett-Packard:pnHPEliteBook8530w:pvrF.0C:rvnHewlett-Packard:rn30E7:rvrKBCVersion90.23:cvnHewlett-Packard:ct10:cvr: 
  dmi.product.name: HP EliteBook 8530w
  dmi.product.version: F.0C
  dmi.sys.vendor: Hewlett-Packard

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