On Sun, 1 Sep 2002, Ralf Hildebrandt wrote:
> On my new Satellite Pro 6100 laptop I have a problem with bouncing
> keys (only when using X11, Console or frambuffer are not affected).
>
> Whenever I use "xkbset bouncekeys 10", I get temporary relief, until I
> switch to the framebuffer console and back. Then the bouncing is back.
>
> This is with kernel-2.4.19, kernel-2.4.19-ac4 and 2.4.20-pre5 and
> XFree-4.2.0 (the experimental Debian packages by branden). I use "nv"
> as driver.
>
> Is there any way of disabling this bouncing permanently.
I've investigated this problem a few months ago. Basically,
it looks like a kernel bug. /dev/console is returning duplicate
key releases when you type fast enough. The text mode console seems
to have a filter that makes things usable, but XFree86, which is
reading the raw data from /dev/console doesn't and is not expecting
the kernel to be passing it junk.
I wrote a filter for XFree86 and I'm attaching the diff against
common/xf86Events.c, but it's a kludge. The problem is really in
the kernel.
Mark.
*** xf86Events.c.old Sun May 19 23:05:02 2002
--- xf86Events.c Sun May 19 23:06:30 2002
***************
*** 262,267 ****
--- 262,269 ----
* ifdefs further (hv).
*/
+ static unsigned char _down_state[256];
+
#ifdef __linux__
extern u_char SpecialServerMap[];
#endif
***************
*** 935,941 ****
}
else
{
! ENQUEUE(&kevent, keycode, (down ? KeyPress : KeyRelease), XE_KEYBOARD);
}
}
#endif /* !__EMX__ */
--- 937,947 ----
}
else
{
! if(_down_state[keycode] || down) {
! ENQUEUE(&kevent, keycode, (down ? KeyPress : KeyRelease), XE_KEYBOARD);
! }
!
! _down_state[keycode] = down;
}
}
#endif /* !__EMX__ */
