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[Launchpad Bug Tracker <884717@xxxxxxxxxxxxxxxxxx>]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: gnome-power-manager (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/884717

Title:
  Asus UL30A backlight malfunction on screen off/wakeup

Status in “gnome-power-manager” package in Ubuntu:
  Confirmed

Bug description:
  On UL30A Bios 212 in Oneiric Ocelot the backlight turns off as
  expected, but on resume the backup does not come up again, until the
  laptop has finished  a (sw)suspend and wakeup cycle.  After that the
  backlight works again until it blacks out again on predefinied
  timeout. (see additional information)

  This bug is definitely reproducible.
  Switching the backlight brightness level from the console using

  sudo setpci -s 00:02.0 F4.B=00
  sudo setpci -s 00:02.0 F4.B=ff

  works well.

  It may be a scripting issue.

  
  additional information:
  While the screen is switched off and backlight is off, no key or key combination will help but FN+F1 (sleep). The same applies for a lid close, if configured.
  Neither setting FN+F5, nor FN+F6 nor FN+F7 nor FN+F8 nor FN+Space  will switch the backlight on again.
  If you use an external light, you can see shadows of the screen content, so it is definitely a backlight issue.

  Using  Ubuntu kernel 3.0.0-12-generic, with tuxonice ppa (does not mak a difference) and kernel options as follows:
  acpi_os_name=Linux acpi_backlight=vendor

  dmesg reports:
  [164260.055928] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored

  This occurs despite acpidump reports 
  ...
  [._OSIa.._O
    02e0: 53 49 0d 57 69 6e 64 6f 77 73 20 32 30 30 30 00  SI.Windows 2000.
    02f0: 70 0a 04 4f 53 56 52 a0 19 5f 4f 53 49 0d 57 69  p..OSVR.._OSI.Wi
    0300: 6e 64 6f 77 73 20 32 30 30 31 00 70 00 4f 53 56  ndows 2001.p.OSV
    0310: 52 a0 1d 5f 4f 53 49 0d 57 69 6e 64 6f 77 73 20  R.._OSI.Windows 
    0320: 32 30 30 31 20 53 50 31 00 70 00 4f 53 56 52 a0  2001 SP1.p.OSVR.
    0330: 1d 5f 4f 53 49 0d 57 69 6e 64 6f 77 73 20 32 30  ._OSI.Windows 20
    0340: 30 31 20 53 50 32 00 70 00 4f 53 56 52 a0 1b 5f  01 SP2.p.OSVR.._
    0350: 4f 53 49 0d 57 69 6e 64 6f 77 73 20 32 30 30 31  OSI.Windows 2001
    0360: 2e 31 00 70 00 4f 53 56 52 a0 1f 5f 4f 53 49 0d  .1.p.OSVR.._OSI.
    0370: 57 69 6e 64 6f 77 73 20 32 30 30 31 2e 31 20 53  Windows 2001.1 S
    0380: 50 31 00 70 00 4f 53 56 52 a0 19 5f 4f 53 49 0d  P1.p.OSVR.._OSI.
    0390: 57 69 6e 64 6f 77 73 20 32 30 30 36 00 70 00 4f  Windows 2006.p.O
    03a0: 53 56 52 a1 4e 07 a0 26 4d 43 54 48 5f 4f 53 5f  SVR.N..&MCTH_OS_
    03b0: 0d 4d 69 63 72 6f 73 6f 66 74 20 57 69 6e 64 6f  .Microsoft Windo
    03c0: 77 73 20 4e 54 00 70 0a 04 4f 53 56 52 a1 44 05  ws NT.p..OSVR.D.
    03d0: a0 39 4d 43 54 48 5f 4f 53 5f 0d 4d 69 63 72 6f  .9MCTH_OS_.Micro
    03e0: 73 6f 66 74 20 57 69 6e 64 6f 77 73 4d 45 3a 20  soft WindowsME: 
    03f0: 4d 69 6c 6c 65 6e 6e 69 75 6d 20 45 64 69 74 69  Millennium Editi
    0400: 6f 6e 00 70 0a 02 4f 53 56 52 a0 17 4d 43 54 48  on.p..OSVR..MCTH
    0410: 5f 4f 53 5f 0d 4c 69 6e 75 78 00 70 0a 03 4f 53  _OS_.Linux.p..OS
    0420: 56 52 a4 4f 53 56 52 14 4e 04 4d 43 54 48 02 a0  VR.OSVR.N.MCTH..
  ...

  Using no acpi_backlight option will result in inusable or erratic
  behaviour of function key combinations.

  May be related to bug: #800625, #741223, #756938

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