7.2.0/sis: RANDR failing to set the mode

[Pavel Troller]

Hi!
  I've compiled 7.2.0 from git (about a week old). Now I'm trying to get it
working on my notebook with SIS65x and 1400x1050 LCD panel.
  All the server looks working, except RandR being unable to switch modes:
patrol at miro:~$ xrandr
Screen 0: minimum 320 x 200, current 1400 x 1050, maximum 1400 x 1050
default connected 1400x1050+0+0 0mm x 0mm
   1400x1050      60.0*
   1280x1024      60.0
   1024x768       60.0
   800x600        60.0
   640x480        60.0
   640x400        72.0
   512x384        60.0
   400x300        60.0
   320x240        61.0
   320x200        71.0
patrol at miro:~$ xrandr -v -s 1280x1024
Server reports RandR version 1.2
Failed to change the screen configuration!

  Similarly, krandrtray fails, as well as setting various modes by apps.
  However, switching modes manually (Ctrl-Alt-+) works perfectly, all the modes
can be cycled over.

  Any hints, how to solve this problem ?
                                With regards, Pavel Troller
  
P.S. In X.Org-6.9.0, which I was using formerly, it worked perfectly.