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From: jnf <jnf@datakill.org>
To: "P. Christeas" <p_christ@hol.gr>
Cc: Jan De Luyck <lkml@kcore.org>, lkml <linux-kernel@vger.kernel.org>
Subject: Re: [2.6.6] Synaptics driver is 'jumpy'
Date: Sun, 16 May 2004 20:08:51 -0500 (EST)	[thread overview]
Message-ID: <Pine.BSO.4.58.0405162007260.20177@metawire.org> (raw)
In-Reply-To: <200405161427.44859.p_christ@hol.gr>

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I just wanted to add that I also have a synaptics mouse, running 2.6.6 and 
yesterday i was compiling 2 copies of xfree86, glibc and gcc at the same 
time getting loads into the 5.x range per uptime and havent experienced 
any problems; well other than my occasional problem of putting an extra 
finger on the mouse pad and then wondering whats wrong.



- -- 

It is only the great men who are truly obscene.  If they had not dared to 
be obscene, they could never have dared to be great.
                -- Havelock Ellis
 


On Sun, 16 May 2004, P. Christeas wrote:

> > Hello List,
> > 
> > Since installing 2.6.6 on my trusty laptop, I can't use the built-in 
> synaptics
> > touchpad anymore. The tracking is totally broken:
> > 
> > When you touch-drag on the touchpad, the mouse cursor will jump to where you
> > stopped your action approx. 1/1.5 seconds _after_ your move. This makes 
> using
> > the touchpad virtually impossible.
> > 
> > This problem is not present under 2.6.5, which I'm running right now.
> > Same .config.
> > 
> > Nothing seems to show up in the logs that could reflect any problem.
> > 
> > Any pointers?
> > 
> > Jan
> > 
> 
> Under normal load this shouldn't happen. It could only have to do with 
> interrupts from PS/2 port.
> However, this shows the actual problem with using Synaptics' absolute mode. I 
> vote against having this as the default setting.
> In the absolute mode, the CPU must process the absolute movements of the 
> finger in order to translate them to mouse movements. That means that, under 
> some system load, the mouse will not respond smoothly any more. I wouldn't 
> like to have increased priority or so just for the mouse.
> In the relative mode, the touchpad processor calculates the movements and 
> queues them as mouse events to the PS/2. This buffering provides smooth 
> movement even under heavy CPU usage. The downside is that in relative mode, 
> the touchpad has no adjustments (only default ones) and no extra features 
> (Z-axis, scroll zones). It may even not have the middle button (which I'm 
> missing most)
> Perhaps we should ask Synaptics for a better relative mode. AFAIK the PIC 
> processor inside the touchpad is not upgradeable, but future models could 
> offer better code..
> 
> Try running the touchpad in relative mode, with 'options psmouse proto=exps' 
> at /etc/modprobe.conf, which disables the Synaptics (i.e. absolute mode).
> 
> -
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> Please read the FAQ at  http://www.tux.org/lkml/
> 
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  parent reply	other threads:[~2004-05-17  1:08 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-05-16 11:27 P. Christeas
2004-05-16 13:28 ` Jan De Luyck
2004-05-16 15:02   ` Alexander Bruder
2004-05-16 17:55     ` aeriksson
2004-05-16 18:27       ` aeriksson
2004-05-17  1:08 ` jnf [this message]
  -- strict thread matches above, loose matches on Subject: below --
2004-05-16 10:22 Jan De Luyck
2004-05-16 17:18 ` Dmitry Torokhov
2004-05-16 19:06   ` Jan De Luyck
2004-05-16 19:29     ` Dmitry Torokhov
2004-05-17  6:32       ` Jan De Luyck
2004-05-17  6:42         ` Dmitry Torokhov
2004-05-17  7:04           ` Jan De Luyck
2004-05-17  8:45             ` Alexander Bruder

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