Re: [Qemu-devel] Bug in SDL key event processing

[Anthony Liguori]

Tomas Carnecky wrote:
> Anthony Liguori wrote:
> > What's lost in your ranting is a concise description of the problem 
> > you've encountered.  What behavior are you seeing and what behavior 
> > do you expect to see?  What kind of physical keyboard do you have and 
> > what is your keyboard configured as in your host and in your guest?  
> > Are you using a '-k' option?
>
> When I press the 'Up' key, the xserver generates an event with keycode 
> 111 (tested with xev). SDL repacks the XEvent to a SDL_KeyboardEvent 
> with keycode=SDLK_UP and scancode=111.

No.  keysym.sym = SDLK_UP.  scancode=111 presumably.

> If I don't supply a keymap name (-k), QEMU uses the SDL scancode as 
> the index into the x_keycode_to_pc_keycode table, but that table 
> incorrectly translates it to 'Print'. If I use '-k en-us', the QEMU 
> sets up a correct SDL-keysym-to-scancode table and then all keys work.

What I assume is happening is that your host keyboard is not setup as 
en-us but your guest is confused with en-us.  That would cause the 
behavior you're seeing.

> You cannot use the SDL scancode under X11, because there's no 
> guarantee that it has any meaningful value. X11 clients have to 
> translate they keycode to a keysym using XKeycodeToKeysym() to get the 
> real value, which you can then for example compare with 'XK_Up'.

What keyboard do you have?  What is your host and guest locale?

Regards,

Anthony Liguoiri

> > I'd be willing to wager that whatever problem you are encountering is 
> > a configuration error on your part (unless you're using a 
> > infrequently tested translation table).
>
> I ran vanilla kvm-userspace.git. Sure, it's not the same as qemu, but 
> I doubt the kvm developers wrote that part of the code. I haven't 
> modified any existing code or keymap files, just added a few printf()s 
> to see what's going on.
>
>
> tom