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[Launchpad Bug Tracker <857678@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

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

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https://bugs.launchpad.net/bugs/857678

Title:
  Toshiba screen brightness fails to function after waking from standby

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  Bought a new laptop (Toshiba Portege R835-P70) and installed xubuntu
  11.04. Everything works fine and is up to date (including screen
  brightness controls) except when it wakes from standby. At that time,
  the brightness controls cease to function. Syslog and kern.log both
  report the same error. I've tried to "cat "brightness:4" >
  /proc/acpi/toshiba/lcd", as su, but it refuses to lower or raise the
  brightness. Video adapter is an Intel generic.  Again, it works
  perfectly fine after a fresh boot, but on waking from standby, the
  screen brightness cannot be changed. I suspect that resuming from
  standby also causes other malfunctions, but I haven't been able to
  confirm it yet.

  Based on other, similar, problems regarding the newer Toshiba laptops,
  it seems that something in the ACPI or toshiba_acpi is buggy.
  Unloading and reloading the toshiba_acpi module does not return
  functionality. I can provide more information if needed.

  Steps to reproduce:
  1. Put laptop into standby, then wake.
  2. Attempt to change brightness settings.

  log of attempting to change brighness after wake:

  Sep 18 15:11:15 PORTEGE-R835 kernel: [  102.456526] ACPI Error: [GTF0]
  Namespace lookup failure, AE_NOT_FOUND (20110112/psargs-359)

  Sep 18 15:11:15 PORTEGE-R835 kernel: [  102.456531] ACPI Error: Method
  parse/execution failed [\_SB_.PCI0.SAT0.PRT0._SDD] (Node
  ffff880147646cd0), AE_NOT_FOUND (20110112/psparse-536)

  Sep 18 15:11:15 PORTEGE-R835 kernel: [  102.456550] ACPI Error: [GTF0]
  Namespace lookup failure, AE_NOT_FOUND (20110112/psargs-359)

  Sep 18 15:11:15 PORTEGE-R835 kernel: [  102.456554] ACPI Error: Method
  parse/execution failed [\_SB_.PCI0.SAT0.PRT0._GTF] (Node
  ffff880147646cf8), AE_NOT_FOUND (20110112/psparse-536)

  Sep 18 15:11:15 PORTEGE-R835 kernel: [  102.458177] ACPI Error: [GTF0]
  Namespace lookup failure, AE_NOT_FOUND (20110112/psargs-359)

  Sep 18 15:11:15 PORTEGE-R835 kernel: [  102.458181] ACPI Error: Method
  parse/execution failed [\_SB_.PCI0.SAT0.PRT0._SDD] (Node
  ffff880147646cd0), AE_NOT_FOUND (20110112/psparse-536)

  Sep 18 15:11:15 PORTEGE-R835 kernel: [  102.458193] ACPI Error: [GTF0]
  Namespace lookup failure, AE_NOT_FOUND (20110112/psargs-359)

  Sep 18 15:11:15 PORTEGE-R835 kernel: [  102.458196] ACPI Error: Method
  parse/execution failed [\_SB_.PCI0.SAT0.PRT0._GTF] (Node
  ffff880147646cf8), AE_NOT_FOUND (20110112/psparse-536)

  Sep 18 15:11:23 PORTEGE-R835 kernel: [  110.661102] ACPI: Failed to switch the brightness
  Sep 18 15:11:23 PORTEGE-R835 kernel: [  110.917468] ACPI: Failed to switch the brightness
  Sep 18 15:11:24 PORTEGE-R835 kernel: [  111.196951] ACPI: Failed to switch the brightness

  lsb_release: (pastebin version: http://pastebin.com/eiTtwhYY)
  PORTEGE-R835:~$ lsb_release -a; lsmod
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description: Ubuntu 11.04
  Release: 11.04
  Codename: natty
  Module Size Used by
  sha256_generic 21031 2
  cryptd 20510 0
  aes_x86_64 17208 160
  aes_generic 38279 1 aes_x86_64
  binfmt_misc 17565 1
  parport_pc 36959 0
  ppdev 17113 0
  dm_crypt 22993 1
  vboxnetadp 13340 0
  vboxnetflt 28297 0
  vboxdrv 252684 2 vboxnetadp,vboxnetflt
  snd_hda_codec_hdmi 28167 1
  snd_hda_codec_realtek 336771 1
  joydev 17606 0
  snd_hda_intel 33176 3
  arc4 12529 2
  snd_hda_codec 103804 3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel
  snd_hwdep 13604 1 snd_hda_codec
  snd_pcm 96391 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
  uvcvideo 72195 0
  snd_seq_midi 13324 0
  videodev 82052 1 uvcvideo
  snd_rawmidi 30486 1 snd_seq_midi
  snd_seq_midi_event 14899 1 snd_seq_midi
  v4l2_compat_ioctl32 17078 1 videodev
  snd_seq 61621 2 snd_seq_midi,snd_seq_midi_event
  iwlagn 333716 0
  snd_timer 29602 2 snd_pcm,snd_seq
  snd_seq_device 14462 3 snd_seq_midi,snd_rawmidi,snd_seq
  snd 67382 16 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
  iwlcore 167502 1 iwlagn
  mac80211 294370 2 iwlagn,iwlcore
  psmouse 73535 0
  serio_raw 13166 0
  cfg80211 178528 3 iwlagn,iwlcore,mac80211
  soundcore 12680 1 snd
  snd_page_alloc 18529 2 snd_hda_intel,snd_pcm
  toshiba_acpi 14180 0
  sparse_keymap 13898 1 toshiba_acpi
  lp 17825 0
  parport 46458 3 parport_pc,ppdev,lp
  i915 515121 2
  e1000e 159096 0
  ahci 25951 2
  drm_kms_helper 42136 1 i915
  libahci 26642 1 ahci
  drm 227534 3 i915,drm_kms_helper
  sdhci_pci 13989 0
  xhci_hcd 77643 0
  sdhci 27387 1 sdhci_pci
  i2c_algo_bit 13400 1 i915
  video 19438 1 i915

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