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

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

[bugzilla-daemon]

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

[bugzilla-daemon]

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





--- Comment #1 from Torsten Krah <tkrah@fachschaft.imn.htwk-leipzig.de>  2011-08-05 20:26:42 ---
Additional Info:

I am able to select 1600x1024 in 2.6.32.x manually in screen resolution tool if
this is of interest.
But i want to use my native resolution, 1400x1050 is selected as default and
this res. does stay when pressing backlight switch, tested more than 4 times
now. The message about the keycode is also gone.

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

[bugzilla-daemon]

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


Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com




--- Comment #2 from Alex Deucher <alexdeucher@gmail.com>  2011-08-05 20:33:42 ---
Sounds like some script/daemon is listening for hotkey events and trying to
change the mode with xrandr.  Please attach your xorg log and config, xrandr
--verbose output and dmesg output.

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

[bugzilla-daemon]

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





--- Comment #3 from Torsten Krah <tkrah@fachschaft.imn.htwk-leipzig.de>  2011-08-06 10:40:09 ---
Config is all autodetect, got no xorg.conf. I am attaching 2.6.32 ones and 3.0
ones. Commented Xorg.0.log-* with my "on"/"off" toggles.
The interesting thing is - this error seems to be a little bit random -
sometimes the on resolution is ok, sometimes its wrong - but i guess i should
not try to understand because  you are the expert and have the knowledge ;).
Hope the logs helps.

--- Comment #4 from Torsten Krah <tkrah@fachschaft.imn.htwk-leipzig.de>  2011-08-06 10:46:47 ---
Created an attachment (id=67742)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=67742)
xrandr output 2.6.32.x

xrandr --verbose

--- Comment #5 from Torsten Krah <tkrah@fachschaft.imn.htwk-leipzig.de>  2011-08-06 10:51:25 ---
Created an attachment (id=67752)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=67752)
xrandr output 3.0

xrandr --verbose

--- Comment #6 from Torsten Krah <tkrah@fachschaft.imn.htwk-leipzig.de>  2011-08-06 10:56:54 ---
Created an attachment (id=67762)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=67762)
dmesg 2.6.32

--- Comment #7 from Torsten Krah <tkrah@fachschaft.imn.htwk-leipzig.de>  2011-08-06 11:04:51 ---
Created an attachment (id=67772)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=67772)
dmesg 3.0

Additional Info - these ones are not generated via Fn+Backlight Switch but are
caused by Fn+F2 (Battery Info); so this has nothing to do with this task -
don't know if i should open another task for those ones or to ignore ... 

[  736.991529] kbd_keycode: 48 callbacks suppressed
[  736.991540] keyboard: can't emulate rawmode for keycode 240
[  736.991567] keyboard: can't emulate rawmode for keycode 240
[  747.397902] keyboard: can't emulate rawmode for keycode 240
[  747.397933] keyboard: can't emulate rawmode for keycode 240

--- Comment #8 from Torsten Krah <tkrah@fachschaft.imn.htwk-leipzig.de>  2011-08-06 11:08:49 ---
Created an attachment (id=67782)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=67782)
Xorg.0.log 2.6.32

--- Comment #9 from Torsten Krah <tkrah@fachschaft.imn.htwk-leipzig.de>  2011-08-06 11:18:40 ---
Created an attachment (id=67792)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=67792)
Xorg.0.log 3.0

--- Comment #10 from Alex Deucher <alexdeucher@gmail.com>  2011-08-06 13:33:46 ---
Looks like some program is listening for hotkey events and trying to
change the mode with xrandr.  Older xservers used to add 1600x1024 mode by
default so that's probably where the mode is coming from.  I'm not sure why
that mode is getting picked when you hit the backlight key, but it's not
something the driver handles.  The driver does not listen for hotkey events. 
You'll have to find out what program is handling the hotkey events on your
system.  This doesn't look like a driver bug.

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

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





--- Comment #11 from Torsten Krah <tkrah@fachschaft.imn.htwk-leipzig.de>  2011-08-07 09:54:20 ---
Hm grepped my system - no one seems to listen for that event.
To confirm this theory i did this:

mv /usr/bin/xrandr > /usr/bin/xrandr.dist

and replaced the xrandr with:

#!/bin/bash
touch /tmp/xrandr.out
echo "Called" >> /tmp/xrandr.out
/usr/bin/xrandr.dist $@


Pressing the backlight key there is no xrandr.out in tmp -> no one called the
tool.
Any other things to look for or to try?

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

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





--- Comment #12 from Alex Deucher <alexdeucher@gmail.com>  2011-08-07 14:44:59 ---
The porgram may be talking randr directly to the Xserver.  What happens if you
hit the button when X isn't running (i.e., just console)?

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

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





--- Comment #13 from Torsten Krah <tkrah@fachschaft.imn.htwk-leipzig.de>  2011-08-08 15:43:11 ---
Oh didn't know this may be possible, my fault, sorry.
If X console is not active all seems to work find - resolution stays the same,
so it seems to be a Xorg only problem.
Do you have any hints, docs links or tipps how to find the "one" who talks to
the Xserver to know to whom to report this issue - the kernel seems to be the
false place, sorry for this false report - but didn't know better and it seems
only to be a issue in kernel 3.0 - 2.6.32.x did not have the issue afaik - so
to me it seemed to be the new kernel ;-) - sorry; btw thx for input and help -
guess can be marked as invalid.

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

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Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |alan@lxorguk.ukuu.org.uk
         Resolution|                            |OBSOLETE




--- Comment #14 from Alex Deucher <alexdeucher@gmail.com>  2011-08-08 16:28:15 ---
No worries, it can get confusing.  Unfortunately, I'm not that familiar with
how each desktop environment handles hotkeys.

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