Re: [Qemu-devel] Problem with QEMU on KVM

[Gerhard Wiesinger <lists@wiesinger.com>]

On Fri, 23 Apr 2010, Gerhard Wiesinger wrote:

> On Thu, 22 Apr 2010, Gerd Hoffmann wrote:
>
>>  Hi,
>> 
>>> Had also a look at ps2.c/ps2.h, pckbd.c: There were no changes which
>>> could explain such a behaviour. Also keyboard is very strange which
>>> switches to CAPS LOCK (shift state) very unmotivated.
>> 
>> Hmm.  Recent qemu tries hard to make sure vncviewer and guest 
>> capslock/numlock state are in sync.  It is a heuristic though and can fail 
>> in certain cases.  Try "-vnc $display,no-lock-key-sync", does that help?
>
> Tracked down the problem of the mouse that te mouse is in absolute mouse mode 
> (verified by logging, therefore coordinates are very high and absolute and 
> not relative):
> static void pointer_event(VncState *vs, int button_mask, int x, int y)
> {
> ...
>    if (vs->absolute) {
>        kbd_mouse_event(ds_get_width(vs->ds) > 1 ?
>                          x * 0x7FFF / (ds_get_width(vs->ds) - 1) : 0x4000,
>                        ds_get_height(vs->ds) > 1 ?
>                          y * 0x7FFF / (ds_get_height(vs->ds) - 1) : 0x4000,
>                        dz, buttons);
>    } else if (vnc_has_feature(vs, VNC_FEATURE_POINTER_TYPE_CHANGE)) {
>        x -= 0x7FFF;
>        y -= 0x7FFF;
> /////////////////////////////////////////////////////////////
> // We get here in (verified by core dump), but we should get into last
> // else
> /////////////////////////////////////////////////////////////
>        kbd_mouse_event(x, y, dz, buttons);
>    } else {
>        if (vs->last_x != -1)
>            kbd_mouse_event(x - vs->last_x,
>                            y - vs->last_y,
>                            dz, buttons);
>        vs->last_x = x;
>        vs->last_y = y;
>    }
>
> ...
> }
>
> Guess problems comes from the following commit (not yet verified):
> commit 37c34d9d5d87ea9d51760310c8863b82cb8c055a
> Author: Anthony Liguori <aliguori@us.ibm.com>
> Date:   Wed Mar 10 09:38:29 2010 -0600
>
>    input: make vnc use mouse mode notifiers
>
>    When we switch to absolute mode, we send out a notification (if the 
> client
>    supports it).  Today, we only send this notification when the client 
> sends us
>    a mouse event and we're in the wrong mode.
>
>    Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


Ok, verified:
git revert -n 37c34d9d5d87ea9d51760310c8863b82cb8c055a
=> works well.

Ciao,
Gerhard

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