[FreeNX-kNX] Image corruption in backing store, painting errors and hang

[Mario Becroft]

jhonyl <jhonyl at netscape.net> writes:

> Hi,
>
>  I run FreeNX 7.0.3 on debian, and I too have problems 1,2.
> In my case ctrl+alt+e helps 2, but then problem 1 starts.

That's interesting. Apparently, control-alt-e toggles "lazy encoding."
Does anyone know what that means?

Do you find that pressing control-alt-e just once (toggling the setting)
solves the problem, or does the problem remain solved even if you toggle
again (back to the original setting)? I will try it next time the
problem happens here.

Regarding the backing store (or perhaps more correctly, save under)
problem, you may find that disabling the backing store will prevent the
symptoms from appearing (I don't know if the same underlying problem is
manifested in other ways though). I find that disabling backing store in
the nxclient configuration is not sufficient; you actually must add this
line to your node.conf:

AGENT_EXTRA_OPTIONS_X="-bs"

(or add "-bs" to your existing AGENT_EXTRA_OPTIONS).

You can check whether it worked by running the following command in the
nx session:

xdpyinfo |grep backing

Normally it will say: "options:    backing-store YES, save-unders YES,"
but if the setting was successful, it will say NO and NO instead of YES
and YES.

Obviously, this will slow down the display when, for instance, menus are
unposted. From what I can tell, at least under gnome, backing store for
ordinary windows is not really used.

Anyway, I am glad I am not the only one having these problems. I wonder
if any of the nx developers have an idea of what might be causing them?

-- 
Mario Becroft <mb at gem.win.co.nz>