[Bug 40622] New: [radeon] - kms wrong resolution mode used after backlight on/off switch

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https://bugzilla.kernel.org/show_bug.cgi?id=40622

           Summary: [radeon] - kms wrong resolution mode used after
                    backlight on/off switch
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.0
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: tkrah@fachschaft.imn.htwk-leipzig.de
        Regression: Yes


Hi,

updated to recent 3.0 kernel (oneiric ubuntu build package) and got some
behaviour i would not expect.
Got a Samsung P35 Notebook - pressing my "backlight" Key does give this in
dmesg:

 keyboard: can't emulate rawmode for keycode 240

On and Off, both a mesage.

The native resolution is 1400x1050 of my LVDS Panel. 

[   23.577259] [drm] Panel ID String: Samsung LTN150P1-L02    
[   23.577264] [drm] Panel Size 1400x1050

But after pressing backlight twice (off+on) my screen resolution does change to
1600x1024 - afaik not supported, at least it is not mentioned in Xorg.0.log for
detected valid panel Modelines.
But it does use this mode after backlight switch:

(II) RADEON(0): Allocate new frame buffer 1600x1024 stride 1600

I wonder why?

However i am forced to switch my resolution back everytime - don't know if its
good for the panel to use this resolution (because i don't know if it will
blast my panel away i'll set prio to high - if this won't going to happen
please set it back to normal ;-) ).

Bug or Feature? Both (message and resolution change) did not happen with
2.6.32.x before, so i guess its a regression, is it?
Tell me if you need more input or kernel testing.

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