Re: Touchpad loses sync with ACPI on.

On 8/2/07, Matthew Marshall <matthew@xxxxxxxxxxxxxxxxxxx> wrote:
I am having a problem with the touchpad and pointer stick on my HP compaq
nc6000 laptop. It only happens when using ACPI.

Both pointing devices work for a while, but eventually start to 'stick'. The
cursor won't move for about a second, and then it jerks all over the screen,
clicking.

This problem gradually increases in frequency, until eventually neither device
works at all. Even cat'ing the respective /dev/input/event* device doesn't
return anything, and I have to shut down or suspend the computer for
about 15 minutes before it will work again. (simply rebooting doesn't fix
it.) (Actually, it sometimes works if I press down REALLY hard... perhaps
that's due to some sensitivity threshold being automatically adjusted?)

Everything works perfectly if I boot with acpi=off.

(I also left Windows open all day once, and it didn't happen there either.)

I'm using kubuntu, and have tested it with kernel 2.6.20, 2.6.22.1, and
2.6.23-rc1.

When the problem happens, I get lines like this from dmesg:

psmouse.c: TouchPad at isa0060/serio4/input0 lost sync at byte 1

or sometimes like this:

psmouse.c: TouchPad at isa0060/serio4/input0 lost synchronization, throwing 4
bytes away.


From Google I have found a few other similar reports. For one person this
seems to happen under load. For me, it sometimes seems to happen right when
I start to compile or something, but it will also happen when I boot up the
computer and don't even touch it. (literally: I'll come back in a half an
hour and the TP doesn't work.)

Someone else seemed to have the problem from reading ACPI states. I have not
been able to find any correlation in this respect. I booted up without the
battery panel applet and without starting acpid, and it still started
hiccuping after 5 minutes.

There seems to be no correlation between how much I use it and how long it
lasts. Sometimes I can be using it constantly and it lasts an hour.
Sometimes I barely touch it and it lasts only 10 minutes.

I'm attaching the output of dmesg, lshw, lsmod and lspci.

So, what more can I do? Is there any more information I can provide? Are
there any patches I can try? I'm willing to help out any way I can.

Thanks for reading,
Matthew Marshall

P.S. I'm not subscribed, so please CC any replies.

P.P.S. Sometimes it seems to be able to read my mind... Just when I think "wow
it's lasting a long time!" it will freeze up within two seconds. I
understand that this might be hard for others to reproduce.

I had a total of three occurrences of a stuck touchpad on
my Dell D610 since upgrading to Fedora 7, with custom
kernels (FC6 was used up to 2.6.22-rc7-git2, never saw
the issue):

[root@sandman ~]# grep -i psmouse /var/log/messages.1
/var/log/messages /var/log/messages.1:Jul 25 22:53:12 sandman kernel:
psmouse.c: GlidePoint at isa0060/serio1/input0 lost synchronization,
throwing 3 bytes away.
/var/log/messages.1:Jul 25 22:53:13 sandman kernel: psmouse.c: resync
failed, issuing reconnect request
/var/log/messages.1:Jul 27 10:43:39 sandman kernel: psmouse.c:
GlidePoint at isa0060/serio1/input0 lost synchronization, throwing 3
bytes away.
/var/log/messages.1:Jul 27 10:43:40 sandman kernel: psmouse.c: resync
failed, issuing reconnect request
/var/log/messages:Jul 30 14:51:20 sandman kernel: psmouse.c:
GlidePoint at isa0060/serio1/input0 lost synchronization, throwing 3
bytes away.
/var/log/messages:Jul 30 14:51:21 sandman kernel: psmouse.c: resync
failed, issuing reconnect request

I always use the touchpad and never the stick, and
actually found out that when the touchpad stops working
with the cursor disappearing, it's a good workaround to
move the stick to get the cursor back (I assume moving
the stick is what actually causes the above messages).

--alessandro

"Did you get married but forgot to get divorced ?"

(Danny and Dusty, 'The Good Old Days')
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