Re: [Bugme-new] [Bug 40492] New: FB_BACKLIGHT should be set by

On Mit, 2011-08-03 at 17:55 -0700, Randy Dunlap wrote: 

On Wed, 3 Aug 2011 18:55:41 GMT bugzilla-daemon@bugzilla.kernel.org wrote:

quoted

https://bugzilla.kernel.org/show_bug.cgi?id@492

           Summary: FB_BACKLIGHT should be set by BACKLIGHT_CLASS_DEVICE
           Product: Other
           Version: 2.5
    Kernel Version: 3.0.0
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Configuration
        AssignedTo: other_configuration@kernel-bugs.osdl.org
        ReportedBy: StormByte@gmail.com
        Regression: No


Created an attachment (idg432)
 --> (https://bugzilla.kernel.org/attachment.cgi?idg432)
Kernel's config

I discovered a scenario in which menuconfig fails to set FB_BACKLIGHT symbol
when needed.

In my case, I have propietary nvidia drivers once loaded Xorg, but in the
meanwhile, I have configured an uvesafb framebuffer (thus, no other framebuffer
active nor compiled).

System works ok, but when trying to install nvidiabl[1] (to control nvidia's
backlight) I find that FB_BACKLIGHT is not set where it should be because I
have BACKLIGHT_CLASS_DEVICE set.

The result is that nvidiabl does not compile.

Sounds like an nvidiabl bug. I'm successfully using backlight control
with radeon KMS with

# CONFIG_FB_BACKLIGHT is not set
CONFIG_BACKLIGHT_CLASS_DEVICE=m


-- 
Earthling Michel Dänzer           |                   http://www.amd.com
Libre software enthusiast         |          Debian, X and DRI developer