Path: utzoo!attcan!uunet!samsung!think!mintaka!bloom-beacon!bu.edu!bu-cs!icad!lcs
From: lcs@icad.COM (Larry Stone)
Newsgroups: comp.sys.hp
Subject: X11 server backing store bugs on HP-UX 6.5
Keywords: X11 HP-UX
Message-ID: <3774@icad.icad.com>
Date: 12 Jan 90 09:42:28 GMT
Organization: ICAD Inc., Cambridge, MA
Lines: 42

The X server that comes with HP-UX 6.5 claims to support backing store,
and even appears to be using backing store when it is requested, but it
also sends spurious Expose events to the backing-store window.  When an
area of a backing-store window is exposed, it is refreshed very quickly,
with what looks like CopyArea from backing store because it draws lines
and text all at once.  Then, the window gets an Expose event for the
same area, and the client redraws it much more slowly.  The backing
store attribute is WhenMapped, but I've also tried Always.
The behavior is the same when running HPWM, UWM, or no window manager.
When backing store is not requested, the initial backing store refresh
is not observed.

I've run my client and the "xev" event monitor against other servers
which implement backing store correctly, a Visual X-19, and MIT X11R3 on
a Sun.  The window never gets Expose events on those servers until it is
unmapped and mapped, so (as xwininfo also shows) the correct
window attributes are being set.

The hardware is an HP-9000/370 with a TurboSRX and one with a 98549.
Running "what /usr/bin/X11/X" prints:
/usr/bin/X11/X:
	X Window System, Version 11    HP-UX 6.5    A.01    $Revision: 9.1 $
	250.1.2.1   01/27/89 libxd300h.a
	250.1.2.1   01/27/89 libxd300l.a
	250.1.2.1   02/01/89 libxd98550.a
	250.1.2.1   01/27/89 libxd98720.a
	250.1.2.1   01/27/89 libxd98730.a
	250.1.2.1   01/27/89 libsdiutils.a

I have not seen this problem reported in the HP-UX Software Status
Bulletin, and my SE was not able to find out anything about it or any X
updates for 6.5.

Is any solution available from HP?  Upgrading to 7.0 won't do, since this
will need to be installed on 6.5 because of other constraints.  I need
the HP server because it has the extensions to run StarBase on the TSRX,
so using the MIT release is not possible either.

	thanks,

	-- Larry Stone     lcs@icad.com  ..!bu.edu!icad.com!lcs
	   ICAD, Inc.