> In the Sun version of the R177 driver you can revert
> to using fixed
> interrupts by uncommenting the following line in
> /kernel/drv/nvidia.conf
> and rebooting:
> 
> #Uncomment the following line if you need to
>  disable the use of MSI interrupts
>  #AllowMSI=0;

Yippee!  I have a graphical login again.  Here's how the interrupts look now:

# echo '::interrupts -d' | mdb -k
IRQ  Vect IPL Bus    Trg Type   CPU Share APIC/INT# Driver Name(s)
...
16   0x84 9   PCIe   Lvl Fixed  0   1     0x0/0x10  nvidia#0
...
24   0x82 7   PCIe   Edg MSI    1   1     -         pcie_pci#0
25   0x83 7   PCIe   Edg MSI    1   1     -         pcie_pci#0
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