> Is there some special magic that's needed to get Xhpc running on the Z50i?
> 
> I'm using the a -current kernel as of yesterday, with the 1.5-release 
> userland, and I get a null pointer error.  For some reason, the machine
> seems to lock up, too.
> 
> Do I need to rebuild X with -current?

For my mistake, hpcfb.c rev1.28 enable experimental wscons multi
screens supports.
But Xhpc dosn't support wscons multi screens environment.

Xhpc core dump in this case, and leave console in WSDISPLAYIO_MODE_MAPPED state.
So it seem to lock up. 
It may recover by ioctl(fd_of_ttyE0, WSDISPLATIO_SMODE, WSDISPLAYIO_MODE_EMUL).

Try run Xhpc with "-dev /dev/ttyE0" or set XDEVICE environment "/dev/ttyE0"
in the envionment.

I re-disable wscons multi screens supoorts in hpcfb.c rev1.29.

If it is not OK in above situation, I have no idea. 

BTW, current kernel support no pointing devices in Z50.
TrackPoint semm to be connect Vr4121 DSIU, but no driver.

sato