[comp.sys.hp] Backing Store on DEC station and HP9000

michels@bob.uucp (Alan Michels) (11/14/89)

I have code that will turn on backing store when requested by the user.
When backing_store is set to NotUseful the program works fine; you can
see our code redrawing the window when it is popped.

When backing store is set to WhenMapped it runs correctly on a Sun 3 running
the MIT release 3 server.  The popped window is all drawn without an
expose call.  

The DECstation 3100 crashes when the window is first displayed.  It runs fine
if backing_store is NotUseful.

The HP 9000 pops the window correctly, it appears with all of the obscured
pixels visible and then it issues an expose event so that everything gets
redrawn anyway.

Is there something else I need to do so that backing store works?  All
of the servers have backing store enabled according to xdpyinfo.


Alan Michels
michels@ide.com
...!{sun,uunet}!ide!michels
Alan Michels
michels@ide.com
..!{sun,uunet}!ide!michels

joel@pandora.pa.dec.com (Joel McCormack) (11/17/89)

The Ultrix 3.1/UWS 2.1 Xcfb server crashes when you use backing store. 
You can't do anything about it, except to start the server using the
``-bs'' option, which turns off backing store.  This is fixed in the UWS
2.2 server, coming soon.

- Joel McCormack (decwrl!joel, joel@decwrl.dec.com)