I asked about missing backing store for some application windows under
FVWM under Linux SuSE. It looks like it is not a FVWM issue but an Xserver
issue.
First of all Dan Espen suggested a way to check whether the server has it
> xdpyinfo | grep back
> options: backing-store NO, save-unders NO
Then Rainer Koehler commented about one specific application (RSI IDL)
> I've used IDL on Solaris and Linux, and I always had to tell it to use
> it's own backing store by putting "device,retain=2" into its
> startup-file.
I discovered the RETAIN option of IDL myself looking in the manual (but my
experience on Digital Unix and Solaris was that the system WAS providing
backing store so I never needed it before).
That would fix this single application nicely. It won't fix a less modern
application of mine which relies on the server.
The clue came again from Dan Espen :
> To turn it on, it your Xorg.conf file add to the Device section:
>
> Option "BackingStore" "True"
> Option "SaveUnders" "True"
I read again the xorg.conf, X and also Xorg and Xservers man pages, and
they are not so explicit or clear about this option, but apparently
putting the first of the two options in /etc/X11/xorg,conf (if SuSE won't
overwrite it next time) does the trick for all applications. I tried also
with both options, and it works too, but the second one is apparently
unnecessary (the xorg log file says "not used").
I'll try to leave it turned on and see whether I notice performance
degradation (so far not).
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Lucio Chiappetti - INAF/IASF - via Bassini 15 - I-20133 Milano (Italy)
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L'Italia ripudia la guerra [...] come Italy repudiates war {...] as a
mezzo di risoluzione delle controversie way of resolution of international
internazionali controversies
[Art. 11 Constitution of the Italian Republic]
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For more info : http://www.mi.iasf.cnr.it/~lucio/personal.html
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