[Qemu-devel] [Bug 1802465] [NEW] typing string via VNC is unreliable

[Zhaocong]

Public bug reported:

QEMU version is 3.0.0

# Description

The problem is that, when typing string through VNC, it can be
unreliable -- sometimes some key strokes get skipped, sometimes get
swapped, sometimes get repeated.  There's no problem when typing through
VNC on physical hardware.

# Steps to reproduce

1. Launch virtual machine by:

    qemu-kvm -display vnc=:1 -m 2048 opensuse-leap-15.qcow2

2. Connect to VNC by:

    vncviewer -Shared :5901

3. Simulate a series of key strokes by "vncdotool" [1]:

    vncdotool -s 127.0.0.1::5901 typefile strings_to_be_typed.txt

4. Usually after a few hundred keys are typed, something goes wrong.

I attached a screenshot that it mistypes " hello" to "h ello".

[1] https://github.com/sibson/vncdotool

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "qemu-vnc-mistype.png"
   
https://bugs.launchpad.net/bugs/1802465/+attachment/5210655/+files/qemu-vnc-mistype.png

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https://bugs.launchpad.net/bugs/1802465

Title:
  typing string via VNC is unreliable

Status in QEMU:
  New

Bug description:
  QEMU version is 3.0.0

  # Description

  The problem is that, when typing string through VNC, it can be
  unreliable -- sometimes some key strokes get skipped, sometimes get
  swapped, sometimes get repeated.  There's no problem when typing
  through VNC on physical hardware.

  # Steps to reproduce

  1. Launch virtual machine by:

      qemu-kvm -display vnc=:1 -m 2048 opensuse-leap-15.qcow2

  2. Connect to VNC by:

      vncviewer -Shared :5901

  3. Simulate a series of key strokes by "vncdotool" [1]:

      vncdotool -s 127.0.0.1::5901 typefile strings_to_be_typed.txt

  4. Usually after a few hundred keys are typed, something goes wrong.

  I attached a screenshot that it mistypes " hello" to "h ello".

  [1] https://github.com/sibson/vncdotool

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