Re: Keys get stuck

Pavel Machek
2008-03-13T17:15:40Z

On Wed 2008-03-12 21:14:56, David Newall wrote:
> Jiri Kosina wrote:
> > Very probably this is due to broken way how X themselves implement
> > auto-repeat, instead of using kernel-provided auto-repeat functionality.
>
> It should be said that X implements auto-repeat out of necessity. While
> the kernel can report key down and up events, its further interpretation
> of those events is not appropriate. Many combinations of events are
> possible, such as keyboard plus mouse, and this precludes the kernel
> from providing a full interpretation. It would be wrong for it to even
> try. X is the proper place to implement auto-repeat for X.

No.

hw is proper place to implement autorepeat, and along with some
buffering, it has chance to work. Kernel is not real-time, and X are
definitely not real-time, while autorepeat is real-time operation.

It actually mostly works in ps/2 case. Buffer in hardware means that
pretty big interrupt delays can be tolerated without problems.

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