Comment 36 for bug 257827

The regression (bug 311716) has been fixed in the current -proposed upload (-11.24):

linux (2.6.27-11.24) intrepid-proposed; urgency=low

  [ Stefan Bader ]

  * Revert "SAUCE: don't use buggy _BCL/_BCM/_BQC for backlight control"
    - LP: #311716
  * SAUCE: acpi: Hack to enable video and vendor backlight implementations
    - LP: #311716
  * SAUCE: Force vendor backlight control on ThinkPad T61
    - LP: #311716

  [ Upstream Kernel Changes ]

  * Revert "thinkpad_acpi: fingers off backlight if video.ko is serving
    this functionality"
    - LP: #311716

Thus this should reintroduce the original bug reported here for many people. It seems we cannot properly fix this without causing regressions for other people. However, with the current -proposed kernel, you can now install local modalias rules to fix your system. (See above). Thus setting back to verification-needed.