[Bugme-new] [Bug 10985] New: backlight doesn't come on after resume with i915 video

bugme-daemon at bugzilla.kernel.org bugme-daemon at bugzilla.kernel.org
Thu Jun 26 02:09:21 PDT 2008


http://bugzilla.kernel.org/show_bug.cgi?id=10985

           Summary: backlight doesn't come on after resume with i915 video
           Product: Drivers
           Version: 2.5
     KernelVersion: 2.6.26-rc8
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI)
        AssignedTo: drivers_video-dri at kernel-bugs.osdl.org
        ReportedBy: jon+bugzilla.kernel.org at alcopop.org


Latest working kernel version: n/a
Earliest failing kernel version: 2.6.26-rc6
Distribution: Debian (sid)
Hardware Environment: Thinkpad X40 (82852/855GM Integrated Graphics Device)
Software Environment: n/a
Problem Description:

After performing a suspend to RAM, my laptop's backlight does not come back on.
Pressing the brightness adjust keys on the laptop has no effect, neither does
prodding /sys/class/backlight/thinkpad_screen/brightness,

With 2.6.25 and earlier, the software tools to manage suspend would perform
quirks (S3 "bios" and "mode") which result in the backlight coming back on
properly.

I first noticed this because pm-utils (the software bit that handles suspend on
behalf of hal and gnome-power-manager etc.) performs a check for 2.6.26 and if
found, doesn't do userspace quirking, assuming that the kernel drivers handle
it all instead.

Steps to reproduce:

boot in single user mode
suspend
resume


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