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[Qemu-devel] [Bug 847638] Re: screendump broken for text mode

From: Cole Robinson
Subject: [Qemu-devel] [Bug 847638] Re: screendump broken for text mode
Date: Tue, 10 Jul 2012 11:41:54 -0000

Should have been fixed by
soon after this report

** Changed in: qemu
       Status: New => Fix Released

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  screendump broken for text mode

Status in QEMU:
  Fix Released

Bug description:
  I use Qemu 0.15.0 (via a FreeBSD qemu-devel-0.15.0 port) and observe the 
  problem with the screendump command.

  - qemu started with a standard vga adapter emulation (not sure if this 
  - SDL interface is used (not sure if this important)
  - guest operating system uses the text mode
  - monitor console is activated with Ctrl+Alt+2
  - screendump command is executed in the monitor console

  I observe the following effects in this case:
  - contents of the guest screen is "dumped" over the monitoring console
  - produced ppm file has only a single top-most line (of characters) from the 

  It seems that the problem is caused in the vga_draw_text function in hw/vga.c.
  The problem is that the dpy_update function is called for each line of text 
  only the first of such calls produces the ppm output.

  Perhaps in the case when full_update is true there should only be a single
  dpy_update call for the whole screen.  I think that this should produce a 
  screen dump.  Not sure if that would help with the guest screen contents being
  draw over the monitor console.

  The code seems to be unchanged in the latest git version.

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