[gentoo-user] Xorg dropping keyboard events?

[gentoo-user] Xorg dropping keyboard events?

[Grant Edwards]

After recent updates Xorg on several of my machines have
started dropping keyboard events.  Sometimes it's a keydown
event -- in which case the keystroke is ignored.  Sometimes
it's a keyup event -- in which case the key repeats
indefinitely until another key is pressed.

It _seems_ to happen more when the CPU is busy, but I can't get
it to happen predictably.  It stated on all of my machines
within the last week or two.  They don't all get updated at the
same time, but it seems to have started on each one after a
recent udpate.

I haven't been able to find anything that seems relevent in
bugzilla.

Has anybody else seen this problem pop up recently?

-- 
Grant Edwards                   grante             Yow! I'd like some JUNK
                                  at               FOOD ... and then I want to
                               visi.com            be ALONE --

Re: [gentoo-user] Xorg dropping keyboard events?

[Helmut Jarausch]

On 29 Jun, Grant Edwards wrote:
> After recent updates Xorg on several of my machines have
> started dropping keyboard events.  Sometimes it's a keydown
> event -- in which case the keystroke is ignored.  Sometimes
> it's a keyup event -- in which case the key repeats
> indefinitely until another key is pressed.
> 
> It _seems_ to happen more when the CPU is busy, but I can't get
> it to happen predictably.  It stated on all of my machines
> within the last week or two.  They don't all get updated at the
> same time, but it seems to have started on each one after a
> recent udpate.
> 
> I haven't been able to find anything that seems relevent in
> bugzilla.
> 
> Has anybody else seen this problem pop up recently?
> 

Yes and No,

I had similar problems but completely deterministic.
When the keyboard is handled by hal it produces different keycodes then
before.

In my case the PgDn key now generates a code which was previously
generated by the key right to the right Windows key.
And in my .Xmodmap I had this code defined as Mode_switch which
made the key "dead" in my editor.
Try using xev to see which codes are generated by the keys which
cause you problems. Then look at all places where X11 key codes are 
redefined i.e. xmodmap is called.

Helmut.

-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany

[gentoo-user] Re: Xorg dropping keyboard events?

[Grant Edwards]

On 2009-06-30, Helmut Jarausch <jarausch@igpm.rwth-aachen.de> wrote:
> On 29 Jun, Grant Edwards wrote:

>> After recent updates Xorg on several of my machines have
>> started dropping keyboard events.  Sometimes it's a keydown
>> event -- in which case the keystroke is ignored.  Sometimes
>> it's a keyup event -- in which case the key repeats
>> indefinitely until another key is pressed.

[...]

>> Has anybody else seen this problem pop up recently?
>
> Yes and No,
>
> I had similar problems but completely deterministic. When the
> keyboard is handled by hal it produces different keycodes then
> before.
>
> In my case the PgDn key now generates a code which was
> previously generated by the key right to the right Windows
> key. And in my .Xmodmap I had this code defined as Mode_switch
> which made the key "dead" in my editor. Try using xev to see
> which codes are generated by the keys which cause you
> problems.

AFAICT, my problem happens with equal frequency for all keys.

> Then look at all places where X11 key codes are redefined i.e.
> xmodmap is called.

The problem isn't that a key produces the wrong result.  The
problem is that sometimes a key will be "missed" and sometimes
a key will "stick" until another key is pressed.  It only seems
to happen under heavy load (e.g. when compiling programs), and
it's now happening on multiple machines.

-- 
Grant Edwards                   grante             Yow! Make me look like
                                  at               LINDA RONSTADT again!!
                               visi.com