Hm you should check out the SDL sources, especially in the last time there
were some additions to the screensaver handling, maybe that'd work.

That's alright, I am waiting for your next release. I simply wanted this bug to be noted before it was released so that a fix might make its way into that release.

Well it needs some interfacing with sdl, it's not automatic.
I'll see about it if i can reproduce the problem.

That's easy to do. Set your screensaver to 1min, fire up any game you want, and sit back to watch the demos. After about a minute, it'll happen. I only noticed the mouse sensitivity changing today while playing Shadow Warrior with a friend. After the screensaver kicked in and we got back to playing, both of us had ultra-sensitive mice!

But the only thing to do against this is disabling the screensaver, right?
Probably only in fullscreen mode or so.

The code snippet I gave you does this. It returns nothing instead of allowing Windows to process the message. Just catch those two messages and return zero and you're set.

http://www.libsdl.org/faq.php?action=listentries&category=9
Sounds like it's disabled by default though, yet as already noted there were
some changes to this handling in the last time.