Bug 14721

Please refer to http://www.intellinuxgraphics.org/how_to_report_bug.html to provide more info like kernel/drm version.

Happens with Fedora kernels since about a week before the bug was filed, so various 2.6.25-rc-ish kernels.  I'm pretty sure airlied has patched in current git drm, though, on top of that.

On my GM945(HP 500), I decreased the brightness by typing:
xbacklight -set 20

when screensaver started, I think the backlight is not turned off because the brightness does not change.

After screen comes back, backlight is correct as before screensaver.

My test against FC8(kernel 2.6.23) and upstream tip for all component(2D driver, xserver, Drm).

Jeremy, please provide more detailed description of your environment, as we can't reproduce your issue here in our environment. Following the requirements mentioned in comment# 1 would be good enough... thanks.

Jeremy, a few more things:
  - 'xrandr --prop'
  - results when ACPI 'video' kernel driver is loaded
  - results when thinkpad_acpi is loaded

thinkpad_acpi gets loaded by dmi, so it was loaded.  video wasn't but I tried it at one point and it didn't make a difference.  

[katzj@aglarond Desktop]$ xrandr --prop
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 1024 x 1024
VGA disconnected (normal left inverted right x axis y axis)
LVDS connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
        BACKLIGHT_CONTROL: combination
                supported: native       legacy       combination  kernel      
        BACKLIGHT: 18937 (0x000049f9) range:  (0,18937)
   1024x768       57.6*+   85.0     75.0     70.1     60.0  
   832x624        74.6  
   800x600        85.1     72.2     75.0     60.3     56.2  
   640x480        85.0     72.8     75.0     59.9  
   720x400        85.0  
   640x400        85.1  
   640x350        85.1  
TV disconnected (normal left inverted right x axis y axis)
        BOTTOM: 37 (0x00000025) range:  (0,100)
        RIGHT: 46 (0x0000002e) range:  (0,100)
        TOP: 36 (0x00000024) range:  (0,100)
        LEFT: 54 (0x00000036) range:  (0,100)
        TV_FORMAT: NTSC-M
                supported: NTSC-M       NTSC-443     NTSC-J       PAL-M       
                           PAL-N        PAL         


But note that that run is after building the driver with th ebacklight patch you posted to the xorg list last week.  And said patch fixes things for me.

*** Bug 15064 has been marked as a duplicate of this bug. ***

Fixed in 1450acd046d47e1739a3ffbd146c73ad2974a935.