[Bug 1859254] [NEW] host window size does not change when guest video screen size changes while moving host window

* [Bug 1859254] [NEW] host window size does not change when guest video screen size changes while moving host window
@ 2020-01-11  0:36 Benjamin David Lunt
  2021-05-02 18:22 ` [Bug 1859254] " Thomas Huth
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Benjamin David Lunt @ 2020-01-11  0:36 UTC (permalink / raw)
  To: qemu-devel

Public bug reported:

When QEMU is emulating a legacy text mode, then switches to a VESA mode,
if you happen to be moving the host window while the switch is made, the
host window never changes size.  The emulated size does, but the host
window doesn't.

For example, at Legacy boot up, the screen mode is mode 03 at 80x25.
Then when the GUEST OS changes the screen to a VESA mode, say
1024x768x16, normally the host window will change to that size to
accommodate the new emulated screen size.

However, if you happen to be moving the host window at the time of the
screen mode change, the host window doesn't change in size to
accommodate the new screen size.

I am using:
  QEMU for Windows, version 4.1.0-11789
  Host: Windows 10 (latest updates)
  Emulating: Intel x64, Legacy BIOS
Command line:
"c:\program files\qemu\qemu-system-x86_64.exe" -m 256 -drive file=C:\fysos64.img,format=raw,if=ide,media=disk,index=0 -parallel file:para.txt -boot c -d guest_errors -vga std -smp cpus=4 -rtc base=localtime,clock=host,driftfix=slew -net none -monitor stdio

I tried different -vga settings:
   -vga std
   -vga cirrus
   -vga vmware
Each did the same thing.

[ Side note (possible error in documentation):
[  at: https://qemu.weilnetz.de/doc/qemu-doc.html#SVGA-graphic-modes-support
[  end of 2.16.2.1
[  (option -std-vga)
[    possibly should be
[  (option -vga std)

If you need an image to test with, I have been using
www.fysnet.net/temp/fysos64.zip (2meg zipped/10meg raw).  It starts in
Legacy BIOS/Hardware mode 3, then switches to VESA 1024x768x16 within a
few seconds, so be ready to move the HOST window when the mode changes.

I do not have a Linux box to test with, so unknown if this is only an
issue with the Windows version or not.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1859254

Title:
  host window size does not change when guest video screen size changes
  while moving host window

Status in QEMU:
  New

Bug description:
  When QEMU is emulating a legacy text mode, then switches to a VESA
  mode, if you happen to be moving the host window while the switch is
  made, the host window never changes size.  The emulated size does, but
  the host window doesn't.

  For example, at Legacy boot up, the screen mode is mode 03 at 80x25.
  Then when the GUEST OS changes the screen to a VESA mode, say
  1024x768x16, normally the host window will change to that size to
  accommodate the new emulated screen size.

  However, if you happen to be moving the host window at the time of the
  screen mode change, the host window doesn't change in size to
  accommodate the new screen size.

  I am using:
    QEMU for Windows, version 4.1.0-11789
    Host: Windows 10 (latest updates)
    Emulating: Intel x64, Legacy BIOS
  Command line:
  "c:\program files\qemu\qemu-system-x86_64.exe" -m 256 -drive file=C:\fysos64.img,format=raw,if=ide,media=disk,index=0 -parallel file:para.txt -boot c -d guest_errors -vga std -smp cpus=4 -rtc base=localtime,clock=host,driftfix=slew -net none -monitor stdio

  I tried different -vga settings:
     -vga std
     -vga cirrus
     -vga vmware
  Each did the same thing.

  [ Side note (possible error in documentation):
  [  at: https://qemu.weilnetz.de/doc/qemu-doc.html#SVGA-graphic-modes-support
  [  end of 2.16.2.1
  [  (option -std-vga)
  [    possibly should be
  [  (option -vga std)

  If you need an image to test with, I have been using
  www.fysnet.net/temp/fysos64.zip (2meg zipped/10meg raw).  It starts in
  Legacy BIOS/Hardware mode 3, then switches to VESA 1024x768x16 within
  a few seconds, so be ready to move the HOST window when the mode
  changes.

  I do not have a Linux box to test with, so unknown if this is only an
  issue with the Windows version or not.

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