xorg hangs after last commits

Following recent changes in dri, xorg server freezes after 20-30 seconds 
of work. mouse works, but the image does not change.
process xorg get 100% cpu
if I delete/rename drm.ko - all OK (but, very slow)


vgapci0_at_pci0:1:5:0:     class=0x030000 card=0x12ff103c chip=0x791e1002 
rev=0x00 hdr=0x00
     vendor     = 'ATI Technologies Inc. / Advanced Micro Devices, Inc.'
     device     = 'ATI RADEON X1200 Series (RS690)'
     class      = display
     subclass   = VGA
     bar   [10] = type Prefetchable Memory, range 64, base 0xd0000000, 
size 134217728, enabled
     bar   [18] = type Memory, range 64, base 0xd8500000, size 65536, 
enabled
     bar   [20] = type I/O Port, range 32, base 0x1100, size 256, enabled
     bar   [24] = type Memory, range 32, base 0xd8400000, size 1048576, 
enabled
     cap 01[50] = powerspec 2  supports D0 D1 D2 D3  current D0
     cap 05[80] = MSI supports 1 message, 64 bit