I have a Wacom Graphire3 tablet and have been finding that, with every SDL 1.3 app I've tested, its being plugged in causes an "Error: Couldn't open stream" error to appear on the command line repeatedly until the program is stopped, degrading performance quite a bit.  Valgrind error logs are also polluted with "Warning: invalid file descriptor -1 in syscall read()".

When I start the program with the tablet unplugged and plug it in after starting, the problem is non-existent, and there is no problem with using it as a mouse.

It might be partially because my tablet is ancient (probably doesn't support touch), but regardless I think SDL should be ignoring the stream and not repeatedly reporting the error.  I've tested this with the most recently available version of SDL 1.3 from Hg (SDL-1.3.0-5498).

(By the way, I noticed the source of the invalid read immediately after the error prints out in src/video/x11/SDL_x11events.c - the error check does nothing but print out the error, and the code immediately continues to read()-ing from the stream.)