Samuel Thibault wrote:
> Li, Haicheng, le Fri 21 Mar 2008 21:02:30 +0800, a écrit :
>> Actually since qemu window disappears immediately after OS enters
>> graphic mode, it's hard to locate the exact step. Only can say it is
>> just after `startx &` on Linux and "driver loading progress bar" on
>> Windows. 
>
> Ok, so that's when we switch to OpenGL rendering.
>
>>> Could you tell the exact configuration of Windows/Linux? Guest
>>> config file is attached. 
>
> Well, I meant the guest configuration actually (resolution/color
> depth). 
Resolution: 800 * 600, color: 24 bit.
>>> Are there useful information in /var/log/xen/qemu-dm-yourdomain.log?
>> Seems no useful info for this bug in qemu log.
>
> Indeed :/
>
> Could you try to use the attached qemu-dm.gdb script for the device
> model? It is just a gdb wrapper around the actual qemu-dm, which
> should let get a backtrace.
There is a segment fault caused by sdl_resize() in tools/ioemu/sdl.c. 
I changed a few code as below and found SDL_SetVideoMode() failed with 
error:Couldn't find matching GLX visual. 
And detailed qemu log is attached.
==
diff -r 76c9cf11ce23 tools/ioemu/sdl.c
--- a/tools/ioemu/sdl.c Fri Mar 21 09:45:34 2008 +0000
+++ b/tools/ioemu/sdl.c Mon Mar 24 16:49:09 2008 +0800
@@ -191,15 +191,18 @@ static void sdl_resize(DisplayState *ds,
 {
 int flags;
 
- // printf("resizing to %d %d\n", w, h);
+ printf("resizing to %d %d\n", w, h);
 
 #ifdef CONFIG_OPENGL
 if (ds->shared_buf && opengl_enabled)
 flags = SDL_OPENGL|SDL_RESIZABLE;
 else
 #endif
- flags = 
SDL_HWSURFACE|SDL_ASYNCBLIT|SDL_HWACCEL|SDL_DOUBLEBUF|SDL_HWPALETTE;
-
+ flags = 
SDL_HWSURFACE|SDL_ASYNCBLIT|SDL_HWACCEL|SDL_DOUBLEBUF|SDL_HWPALETTE;
+
+#ifdef CONFIG_OPENGL
+ printf("opengl is defined\n");
+#endif
 if (gui_fullscreen) {
 flags |= SDL_FULLSCREEN;
 flags &= ~SDL_RESIZABLE;
@@ -210,11 +213,11 @@ static void sdl_resize(DisplayState *ds,
 
 again:
 screen = SDL_SetVideoMode(w, h, 0, flags);
-#ifndef CONFIG_OPENGL
 if (!screen) {
 fprintf(stderr, "Could not open SDL display: %s\n", SDL_GetError());
 exit(1);
 }
+#ifndef CONFIG_OPENGL
 if (!screen->pixels && (flags & SDL_HWSURFACE) && (flags & 
SDL_FULLSCREEN)) {
 flags &= ~SDL_HWSURFACE;
 goto again;
-- haicheng

Attachment: qemu-log.txt
Description: qemu-log.txt

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