[?]Strange persistent artifact on screen with Knoppix 8.6 after "Suspend-Restart"s

[szzsqing1]

Although you do not write about this, I think that this problem does not occur in live mode, and, as you said, it is related to your persistent changes. Probably it is a Knoppix LXDE (X, Compiz?) bug. I remember that I had similar experiences, not after suspend, but in plain LXDE session: did not disappear the window size notification from the desktop. If I remember well, I resolved this by resizing again a window with mouse or logging out/in from X. But the latest is also problematic (at least in Knoppix 9.1 which I use), the implementation of logging out/in is buggy. If not a problem for you, you can use Gnome or KDE, or replace your persistent /home/knoppix directory with the live version one, of course in a live session (first save your important configuration dirs, files, and after replace them back). Maybe it helps if you use LXDE-Openbox session instead of LXDE-Compiz. Unfortunately in current Knoppix you have to use the buggy Compiz, cannot switch to LXDE-Openbox.

Nowadays the Knoppix LXDE implementation is pretty buggy, a lot of things changed during Knoppix history... There are Knoppix scripts that are not needed anymore or does not function as expected. Should be done a general maintenance. Or even better changing the default LXDE to LXQt, wich is actively maintained, or to Trinity desktop, wich has a lot of features, it is lightweight, and actively maintained, too.