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

[Tomas Carnecky <tom@dbservice.com>]

QEMU assumes that the xserver uses the xfree86 model. See files in 
/usr/share/X11/xkb/keycodes/, especially 'xfree86' and 'evdev'. The 
files translate from scancodes that the drivers generate into xserver 
keycodes. The xfree86 file has '<UP> = 98', meaning that if the xkb 
driver generates 98 it means the user pressed the UP key. When QEMU uses 
`98 - 97` as the index into the x_keycode_to_pc_keycode table, which 
yields the correct Up scancode. But the 'evdev' keycode file in the xkb 
directory has '<UP> = 111', meaning that the evdev driver generates 
keycode 111 for the UP key.

Again, you _can not_ assume that the X keycode (XKeyEvent.keycode or 
SDL_KeyboardEvent.scancode) has any particular meaning. If you run on 
pure X11, you have to translate it into a keysym (XKeycodeToKeysym()) 
and use that instead. If you run on SDL, you have to use keysym.sym.

Am I the only one who uses the evdev driver and runs QEMU? I can't 
believe that.

tom