Path: utzoo!attcan!uunet!ginosko!usc!apple!bloom-beacon!pdaeng.UUCP!willson
From: willson@pdaeng.UUCP (Stephen Willson)
Newsgroups: comp.windows.x
Subject: Lego upgrade and MIT sample server (hack fix)
Message-ID: <8909132232.AA20325@madrid.local>
Date: 13 Sep 89 22:32:03 GMT
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 47


Problem:

Has anyone else upgraded a 4/110 with the Lego (GX) board from sun and had
the MIT sample server stop working?  We are running SUN/OS 4.0.3., with patches
1-9 except the set in the middle that apply only to xman.  We have some
Sparcstation-1's as well, and they work okay as other net-posters have claimed.
We were hoping our 4/110's would be identical now to the Sparcstation-1's 
except slower processor speed.

What happens:
run xinit 
   (aliased to alias xinit 'xinit $HOME/.xinit; kbd_mode -a; clear_colormap')
the color of the foreground turns light orange (same as on Sparcstation).
the screen flashes for a micro-second, trying to initialize.
core is dumped
csh gets a million EOF's until it logs me out.

We have the same /dev entries on the Sparcstation-1's as the 4/110s, with a 
cgthree0 entry and a cgsix0 entry.

Fix:  (added 45 minutes after writing above paragraphs)

Since I wrote the above paragraphs, I tracked the problem down to line 506
in server/ddx/sun/sunCG4C.c, which is trying to enable the overlay plans.
I don't have the foggiest idea why it doesn't try to do this on the 
Sparcstation-1 but if someone else wants to pursue it this is the place
to start.  My hack fix is to remove the line that tries to do that:

#ifdef notdefPDA
    /* Now set the enable plane for color */
    if (index == 0) sunCG4CSwitch (&(pScreenInfo->screen[0]), 0);
#endif

Note that I had tried using xinit $HOME/.xinit -- -dev /dev/cgfour0 to
keep it from blasting the overlay planes but that didn't work.  The server
dies saying "can't find any displays" and then logs me out.

I have to say, I find that the ability of the server to log me out by
screwing up my standard input is quite amazing.


Stephen Clarke-Willson
Software Architect
PDA Engineering
willson@pda.com
714/540 8900 x291