X11 int10h trouble with ruby on amd64

[Helge H. <hel...@ai...>]

I have been running ruby successfully for a while.  Today I tried
to get the machine going in 64-bit mode, it is an opteron after all.

The kernel is 2.6.10-ruby and seems to work fine.
I installed debian testing (pure64) and copied
the X config files from the working 32-bit installation.

Unfortunately, I get only one X server up now.
The other one needs int10 initialization, and that seems to fail.
Here is the end of the log:

(II) RADEON(0): Using 8 bits per RGB (8 bit DAC)
(II) Loading sub module "int10"
(II) LoadModule: "int10"
(II) Reloading /usr/X11R6/lib/modules/linux/libint10.a
(II) RADEON(0): initializing int10
(**) RADEON(0): Option "InitPrimary" "on"
(II) Truncating PCI BIOS Length to 53248

   *** If unresolved symbols were reported above, they might not
   *** be the reason for the server aborting.

Fatal server error:
Caught signal 11.  Server aborting


Is there any special tricks to get int10 working on amd64?
I have installed the ia32-libs package, so that 32-bit software works.

Helge Hafting