Messages in this thread | | | Date | Sun, 16 May 2004 20:08:51 -0500 (EST) | From | jnf <> | Subject | Re: [2.6.6] Synaptics driver is 'jumpy' |
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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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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). > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2 (OpenBSD)
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