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[Bug Watch Updater <194489@xxxxxxxxxxxxxxxxxx>]

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http://bugs.freedesktop.org/show_bug.cgi?id=19736.

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On 2009-01-25T11:28:36+00:00 Jostein Bø Fløystad wrote:

Using powertop to monitor cpu wakeups on a laptop on battery (my case:
thinkpad t400), the number of wakeups rises for the "PS/2
keyboard/mouse/touchpad" from less than five to around 400 hundred or
more (resulting in a rise in power consumption of 2-3 Watts in most
cases -- quite significant on a laptop) when the touchpad is used.

How to reproduce: Start powertop as root when the machine is idle and
wait for it to stablize it's measurements. Then move the pointer around
a lot, and wait for powertop to refresh its readings. The same effect is
not seen while typing.

The same issue has also been reported elsewhere:

Ubuntu bug report:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-synaptics/+bug/194489

Arch linux forum thread:
http://bbs.archlinux.org/viewtopic.php?pid=486690

As the same appears on different distributions and kernel versions, it
is likely to be caused by the driver, although I can't be sure.

My system specs:
Lenovo Thinkpad T400
Synaptics touchpad (part of an UltraNav)
Arch Linux x86_64
version 0.99.3 of xf86-input-synaptics

Reply at: https://bugs.launchpad.net/linux/+bug/194489/comments/17

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On 2009-01-25T11:33:18+00:00 Jostein Bø Fløystad wrote:

Created an attachment (id=22229)
Output from powerto -d with touchpad movement

Reply at: https://bugs.launchpad.net/linux/+bug/194489/comments/18

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On 2009-01-25T11:34:34+00:00 Jostein Bø Fløystad wrote:

Created an attachment (id=22230)
Output from powerto -d without touchpad movement

Reply at: https://bugs.launchpad.net/linux/+bug/194489/comments/19

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On 2009-02-01T14:56:19+00:00 Peter Hutterer wrote:

>From the original bugreport:

"powertop reports a huge amoun of wakeups from the touchpad. Notice that
this is independent of the synaptics driver being loaded or not. I get
the exact same results with an out of the box xorg.conf where the
touchpad is recognized as a plain mouse. The screenshot shows the
problem."

This is a kernel issue, not one of the X.Org synaptics driver ->
NOTOURBUG.

Reply at: https://bugs.launchpad.net/linux/+bug/194489/comments/20


** Changed in: xorg-driver-synaptics
       Status: Invalid => Won't Fix

** Changed in: xorg-driver-synaptics
   Importance: Unknown => Medium

-- 
ps2 synaptics touchpad causing huge amounts of wakeups
https://bugs.launchpad.net/bugs/194489
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