[Info-vax] Radeon 7500 PCI: I64 works, Alpha not?

[MG]

Recently I've tried an ATi Radeon 7500 (PCI, 64 Mbyte) card from one of
my rx2620s in a DS10.  Strangely enough, it works fine under VMS I64,
but not under Alpha.  Did I perhaps overlook something?  I've tried 32-
and 64-bit PCI slots in the DS10, as well as both the DVI and D-sub
(HD15 VGA) ports, but both just give me 'garbage' output (only after
restarting DECwindows via "@SYS$SYSROOT:[SYSMGR]DECW$STARTUP RESTART"
twice).

  - MG