When the pointer enters the Qemu window it calls SDL_WM_GrabInput, which calls XGrabPointer in a busyloop until it returns GrabSuccess. However if there's already a pointer grab (screen is locked, a menu is open) then qemu will hang until the grab can be taken. In the specific case of a headless X server on an autobuilder, once the screensaver has kicked in any qemu instance that appears underneath the pointer will hang. I'm not entirely sure why pointer grabs are required (the documentation explicitly says it doesn't do grabs when using a tablet, which we are) so wrap them in a conditional that can be set by the autobuilder environment, preserving the current grabbing behaviour for everyone else. Upstream-Status: Pending Signed-off-by: Ross Burton From 4b1988ecb01a178269ec0513a75f2ec620c7ef6a Mon Sep 17 00:00:00 2001 From: Ross Burton Date: Wed, 18 Sep 2013 14:04:54 +0100 Subject: [PATCH] sdl.c: allow user to disable pointer grabs Signed-off-by: Ross Burton Signed-off-by: Eric Bénard --- ui/sdl.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) Index: qemu-2.11.1/ui/sdl.c =================================================================== --- qemu-2.11.1.orig/ui/sdl.c +++ qemu-2.11.1/ui/sdl.c @@ -63,6 +63,10 @@ static SDL_PixelFormat host_format; static int scaling_active = 0; static Notifier mouse_mode_notifier; static int idle_counter; +#ifndef True +#define True 1 +#endif +static doing_grabs = True; #define SDL_REFRESH_INTERVAL_BUSY 10 #define SDL_MAX_IDLE_COUNT (2 * GUI_REFRESH_INTERVAL_DEFAULT \ @@ -431,14 +435,16 @@ static void sdl_grab_start(void) } } else sdl_hide_cursor(); - SDL_WM_GrabInput(SDL_GRAB_ON); + if (doing_grabs) + SDL_WM_GrabInput(SDL_GRAB_ON); gui_grab = 1; sdl_update_caption(); } static void sdl_grab_end(void) { - SDL_WM_GrabInput(SDL_GRAB_OFF); + if (doing_grabs) + SDL_WM_GrabInput(SDL_GRAB_OFF); gui_grab = 0; sdl_show_cursor(); sdl_update_caption(); @@ -986,6 +992,8 @@ void sdl_display_init(DisplayState *ds, * This requires SDL >= 1.2.14. */ setenv("SDL_DISABLE_LOCK_KEYS", "1", 1); + doing_grabs = (getenv("QEMU_DONT_GRAB") == NULL); + flags = SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE; if (SDL_Init (flags)) { fprintf(stderr, "Could not initialize SDL(%s) - exiting\n",