[Bug 1574246] Re: Drunken keyboard in go32v2 programs

[Thomas Huth]

The QEMU project is currently considering to move its bug tracking to
another system. For this we need to know which bugs are still valid
and which could be closed already. Thus we are setting older bugs to
"Incomplete" now.

If you still think this bug report here is valid, then please switch
the state back to "New" within the next 60 days, otherwise this report
will be marked as "Expired". Or please mark it as "Fix Released" if
the problem has been solved with a newer version of QEMU already.

Thank you and sorry for the inconvenience.


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

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https://bugs.launchpad.net/bugs/1574246

Title:
  Drunken keyboard in go32v2 programs

Status in QEMU:
  Incomplete

Bug description:
  QEMU 2.5.0, SeaBIOS 1.9.1; I've been noticing this bug for quite a
  while, though.

  Steps to reproduce:

  # Create a VM image, install DOS in it (doesn't matter which) and launch it.
  # Launch a "bare DOS" DPMI host (not an operating system) in it; I tested 
with CWSDPMI and HDPMI32.
  # Run a go32v2 program which reads keyboard input (say, the Lua interpreter: 
<http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/distributions/1.1/repos/devel/lua.zip>;
 the Free Pascal IDE will also do; on the other hand, DOS/4GW programs seem 
unaffected).
  # Quickly type in something random (e.g. alternate between hitting "p" and 
"q"), then optionally move the cursor left and right.
  # Observe how some keystrokes are missed, and some are caught twice.

  The issue does NOT arise:
  * on bare metal DOS,
  * in VirtualBox,
  * in Bochs with stock Plex86 BIOS,
  * in Bochs with SeaBIOS,
  * in DOSEMU,
  * in DOSBox,
  * in QEMU when the DPMI host is Windows 3.11/9x
  so at this point I'm reasonably sure that it's the fault of either QEMU or 
SeaBIOS, and probably the former. The issue arises regardless of whether KVM is 
enabled.

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