Also, setting a bigger than desktop resolution succeeds, but the window is mostly out of the screen (I can only see the bottom right corner of it).
Setting a very big resolution (to force it failing) just crashes. According to the debugger, here's the problem:
It crashes at line 1981 (my birth year ). The debugger shows that display = NULL.
There's one annoying thing: allegro keeps trying to create a window for like 30 seconds. The taskbar goes crazy showing an allegro window being created and destroyed, until the crash.
Using Allegro 5.0.3 (precompiled binaries from here).
Note: Maybe this has already been reported, my allegro.cc search-fu is pretty weak
[Edit]
I'm pretty sure I selected allegro development subforum, but it seems I did not
It's definitely a bug in that it doesn't bother to check return values.