xrandr and radeonhd crtc problem

I have been having a problem with my 6910p re-enabling the DVI or VGA external output. It does work when I re-login or restart X, but after I disconnect the external monitor for a long time I couldn't enable it back. Here is what is happening to me:

xrandr --output DVI-D_1 --auto --right-of PANEL
X Error of failed request:  BadMatch (invalid parameter attributes)
Major opcode of failed request:  154 (RANDR)
Minor opcode of failed request:  21 ()
Serial number of failed request:  19
Current serial number in output stream:  19

To resolve the issue I have to explicitly pass in the crtc number

xrandr --output DVI-D_1 --crtc 1 --auto --right-of PANEL

For a more detailed discussion of the problem you can look at xorg mailing list archive post here:

http://lists.freedesktop.org/archives/xorg/2007-November/030024.html

A newer xrandr should resolve the issue in the future, for now I just use --crtc switch.