Re: [2.6.6] Synaptics driver is 'jumpy'

[jnf]

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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.



- -- 

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                -- 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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