semantic: 0.815
graphic: 0.705
device: 0.702
other: 0.691
socket: 0.666
debug: 0.601
files: 0.554
performance: 0.550
PID: 0.515
vnc: 0.487
boot: 0.449
network: 0.391
permissions: 0.365
KVM: 0.293

unsupported screen resolution crashes sdl-qemu

if the (windows) guest sets a screen resolution that the SDL backend does not support,
qemu does an exit(1).
with this fix, the the resolution is still wrong (only part of the desktop is displayed),
but qemu keeps running and the guest can auto-revert the video mode:

ui/sdl.c:do_sdl_resize()
    SDL_Surface * tmp_screen;
    tmp_screen = SDL_SetVideoMode(width, height, bpp, flags);
    if (!tmp_screen) {
//      fprintf(stderr, "Could not open SDL display (%dx%dx%d): %s\n", width, 
//              height, bpp, SDL_GetError());
//      exit(1);
    } else {
        real_screen = tmp_screen;
    }

Sorry, a little confusion what's the problem you want to solve?

its in the first sentence. let me rephrase: the (windows) guest can select some screen resolution which SDL cannot
provide. what happens is that qemu quits without giving the quest a chance to shut down. thats like having a monitor
that crashes windows when it doesnt support the video mode.

Yes, it is a bug. It should go back to the previous setting if the new screen resolution falied.
I will send a patch later. 

Thanks.

Patch posted:

http://patchwork.ozlabs.org/patch/270084/

this patch does solve the problem

Patch has been included here a while ago already:
http://git.qemu.org/?p=qemu.git;a=commitdiff;h=898ae2846de4dcb1
... so this ticket could now be marked as fixed.