Re: PS2 mouse going nuts during cdparanoia session.

From: Jacek Kawa (
Date: Wed Jul 16 2003 - 21:03:24 EST

Mikael Pettersson wrote:

> >This is basically because the check for lost bytes wasn't present in
> >2.4. Now that it is there, it works well with real lost bytes, but will
> >fire also in case when the mouse interrupt was delayed for more than
> >half a second, or if indeed a mouse interrupt gets lost. The 2.5 kernel
> >by default programs the mouse to high speed reporting (up to 200 updates
> >per second). This may, possibly make the problem show up easier.
> This was interesting: 2.5 programs the mouse differently than 2.4.
> I've been having ps2 mouse problems with the 2.5 input layer,
> including having to move the mouse much further for a given
> cursor movement, and a general jerky/unstable feeling of the mouse.

Strange. Here I've got problems with my mouse being actually 'to fast'
(when working with X-Window; I had to slow it down about 2 times via
xset to be able to work 'normally'; Actually -since I could not find
any related bugreports or complains - I thought it was something with
how my version of X works with new layer)

> 2.4's pc_keyb.c has (disabled by default) init code which puts the
> mouse in 100 samples/s and 2:1 scaling, whereas 2.5 puts it into
> 200 samples/s and 1:1 scaling. So I hacked psmouse-base.c to mimic
> 2.4, and VOILA! now my mouse feels A LOT better.

And here it goes even faster than before.
Live is indeed full of suprises :)



Jacek Kawa  
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