other: 0.175
semantic: 0.129
socket: 0.121
device: 0.091
debug: 0.089
PID: 0.083
graphic: 0.059
vnc: 0.058
boot: 0.044
permissions: 0.043
performance: 0.031
network: 0.028
KVM: 0.026
files: 0.025
debug: 0.267
files: 0.124
device: 0.103
socket: 0.093
PID: 0.080
network: 0.073
performance: 0.070
other: 0.053
boot: 0.047
semantic: 0.030
vnc: 0.020
permissions: 0.019
graphic: 0.015
KVM: 0.006

Strange keyboard behaviour in Vim editor


I'm running MS-DOS 7.10 in a QEMU virtual machine, and there is a problem with the keyboard in the Vim editor.  The arrow keys jump over a line, as if you had typed the key twice.  PgUp and PgDn are likewise affected.  Other applications are not affected, unless you shell out from Vim.

The QEMU version is 5.0.0, and I'm using the "-k sv" option, but I've tried without it and it doesn't make a difference.

I don't get this keyboard behaviour in the exact same VM under VMware Player or Bochs.

-Albert.

Possible fix:
https://<email address hidden>/msg804823.html

The patch mentioned by Philippe has now been merged to the QEMU master branch (commit d1e45668d2128b064). Albert, could you maybe check the current git version to see whether this problem has been fixed now (using "-global i8042.kbd-throttle=on" to enable this new feature)?

Hi,

thanks for letting me know.

I do plan to test this and report back, but that may take some time, as I
would first have to compile and install a new version of QEMU.

-aw

On Thu, 27 May 2021 at 05:10, Thomas Huth <email address hidden>
wrote:

> The patch mentioned by Philippe has now been merged to the QEMU master
> branch (commit d1e45668d2128b064). Albert, could you maybe check the
> current git version to see whether this problem has been fixed now
> (using "-global i8042.kbd-throttle=on" to enable this new feature)?
>
> ** Changed in: qemu
>        Status: In Progress => Fix Committed
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1897568
>
> Title:
>   Strange keyboard behaviour in Vim editor
>
> Status in QEMU:
>   Fix Committed
>
> Bug description:
>
>   I'm running MS-DOS 7.10 in a QEMU virtual machine, and there is a
> problem with the keyboard in the Vim editor.  The arrow keys jump over a
> line, as if you had typed the key twice.  PgUp and PgDn are likewise
> affected.  Other applications are not affected, unless you shell out from
> Vim.
>
>   The QEMU version is 5.0.0, and I'm using the "-k sv" option, but I've
>   tried without it and it doesn't make a difference.
>
>   I don't get this keyboard behaviour in the exact same VM under VMware
>   Player or Bochs.
>
>   -Albert.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/qemu/+bug/1897568/+subscriptions
>


Can someone explain why the patch keeps the incorrect behaviour as the default? It’s silly.

Felix, if you want to discuss the default behaviour, please get in touch with the author of the patch, since he might not read this bug tracker here.
Anyway, the patch has been released with QEMU 6.1, so I'm closing this ticket here now.