ubuntu-x-swat team mailing list archive

[Seth Forshee <seth.forshee@xxxxxxxxxxxxx>]

On Fri, Sep 30, 2011 at 02:06:03AM -0000, Andrew Skalski wrote:
> Hi Seth,
> 
> Thanks for your work on this.  I'm trying out 0.9 right now, and ran
> into a problem (Dell Precision M4600).  It was working fine for about 40
> minutes, until the driver (apparently) lost synchronization with the
> event data.  The mouse pointer began jittering slightly, without me
> touching the touchpad.  Putting my finger on the touchpad generated
> stray click events and wild movement of the pointer.
> 
> Doing an rmmod+modprobe restored it to proper behavior.  Nothing
> interesting was written to the kernel log.

That's strange. I kind of doubt it truly lost sync, as there's code
there to reject packets if (byte_0 & 0x8f) != 0x8f or bit 7 is set in
any subsequent byte of the packet. This just doesn't make sense -- the
pointer shouldn't move at all if you aren't touching the touchpad
because the hardware shouldn't be sending any data.

If you can get this to happen again, could you please write 1 to
/sys/module/psmouse/parameters/alps_dump_packets. Let it sit for a few
seconds, then run 'dmesg -c > dmesg-notouch.txt', then move your finger
around on the touchpad again and run 'dmesg -c > dmesg-touch.txt'. Give
me both of the files so I can take a look.

Thanks!

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-input-synaptics in Ubuntu.
https://bugs.launchpad.net/bugs/550625

Title:
  Alps touchpad is recognized but synaptics clients and scrolling do not
  work

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