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[Qemu-devel] [Bug 691424] Re: qemu/kvm SDL over ssh -X broken


From: Thomas Huth
Subject: [Qemu-devel] [Bug 691424] Re: qemu/kvm SDL over ssh -X broken
Date: Thu, 15 Dec 2016 15:48:57 -0000

Can you still reproduce this issue with the latest version of QEMU, with
the latest version of SDL?

** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/691424

Title:
  qemu/kvm SDL over ssh -X broken

Status in QEMU:
  Incomplete

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 <address@hidden>
  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 <address@hidden>
      Signed-off-by: Anthony Liguori <address@hidden>

  :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.

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