Having recently moved from Alpha to SuSE Linux (using fvwm as window
manager, but kdm to start X as default with SuSE [9.2]) I've noticed a
funny behaviour in some applications :
(1) RSI IDL plot windows seems not to have any backing store. When they
are obscured I lose the obscured part, when I move them to another
dekstop page I lose all.
(on Alpha they used to behave like that only after several days the
server was running, like it had exhausted backing store memory)
NB xwininfo returns
Backing Store State: Always
Save Under State: no
(2) a small application of mine (Fortran wrapped around C Xlib calls)
has a similar behaviour (on Alpha it did work). Windows are created
with
flag=CWBitGravity|CWWinGravity|CWBackingStore;
XChangeWindowAttributes(dpy,win,flag,&attrib);
(3) the Hessling editor (the) in Xcurses mode sometimes presents a
problem (when I do a large mouse cut-an-paste it hangs, and then if I
obscure part of the edit window it remains white and deprived of
textual content).
This behaviour occurred also (more frequently) on Alpha and is
possibly unrelated with the other two (looks more an overflow of
the clipboard)
Anyhow xthe windows return to xwininfo
Backing Store State: NotUseful
Save Under State: no
which is also what xterm or rxvt do (and they work)
Now I wonder whether this has anything to do with fvwm or with the X
server. I tried adding this to my .fvwmrc, but with no effect
Style * BackingStore
Style * SaveUnder
I have no idea of how to check whether backing store is enabled in the X
server. It looks like the server runs as
/usr/X11R6/bin/X -nolisten tcp -br vt7 -auth blabla
but some of those options are undocumented in the X man page (and it does
not mention backing store).
Any clue ?
----------------------------------------------------------------------------
Lucio Chiappetti - INAF/IASF - via Bassini 15 - I-20133 Milano (Italy)
For more info : http://www.mi.iasf.cnr.it/~lucio/personal.html
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