One possible way to get X11-forwarding back on qemu master is to disable zoom by this patch.
But I do not know why the do_sdl_resize function should be problematic. There is probably a better solution. ** Patch added: "disable zoom" https://bugs.launchpad.net/qemu/+bug/691424/+attachment/1769014/+files/sdl-x11-fix1.diff -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/691424 Title: qemu/kvm SDL over ssh -X broken Status in QEMU: New Bug description: qemu/kvm by default uses SDL to render the output of its emulated VGA graphics. This is broken over ssh -X since quite a while. The only workaround I know, is to use qemu -vnc :0 and connect using vncviewer How To Reproduce: 1. zypper in qemu 2. ssh -X localhost qemu -cdrom ANYISOFILE Actual Results: qemu hangs in an endless loop on the BIOS display screen Expected Results: should boot up the iso as 0.10 versions did Reproducible: Always this is what broke it: $ git bisect bad c18a2c360e3100bbd71162cf922dcd8c429a8b71 is first bad commit commit c18a2c360e3100bbd71162cf922dcd8c429a8b71 Author: Stefano Stabellini <stefano.stabell...@eu.citrix.com> Date: Wed Jun 24 11:58:25 2009 +0100 sdl zooming Hi all, this patch implements zooming capabilities for the sdl interface. A new sdl_zoom_blit function is added that is able to scale and blit a portion of a surface into another. This way we can enable SDL_RESIZABLE and have a real_screen surface with a different size than the guest surface and let sdl_zoom_blit take care of the problem. Signed-off-by: Stefano Stabellini <stefano.stabell...@eu.citrix.com> Signed-off-by: Anthony Liguori <aligu...@us.ibm.com> :100644 100644 a06c9bfc22cc6de1c6e5e9068d6bf59d89613767 f8dc5065dd27010bfdbb6bcfb0c6e3af25024cdb M Makefile :100644 100644 417217582363a87ee67e746ba798e285a64b6cdc 35183399f65de6f50f3baa4767ab7d4d11d45bca M console.h :100644 100644 178b5532b8d9dd2194a8662fbfdcd49b4bc04222 d81399e51276e1c97fa1f7272ef16ea4c312b51b M sdl.c :000000 100644 0000000000000000000000000000000000000000 56d3604fc3d79e4cc4622be8437c78bf70075da3 A sdl_zoom.c :000000 100644 0000000000000000000000000000000000000000 33dc63408b43a37fd6b1acde3fa62b1a51315e75 A sdl_zoom.h :000000 100644 0000000000000000000000000000000000000000 64bbca849bd3af678c2259b4d8cc0e48c6a6b43c A sdl_zoom_template.h This problem occurs on both Debian and openSUSE.