Samsung NC10 touchpad generates hundreds of interrupts per second

Bug #487347 reported by Jon Grossart on 2009-11-23
12
This bug affects 2 people
Affects Status Importance Assigned to Milestone
xserver-xorg-input-synaptics (Ubuntu)
Undecided
Unassigned

Bug Description

Binary package hint: xserver-xorg-input-synaptics

Ubuntu 9.10 fresh install (generally base configuration with no external hardware connected)
xserver-xorg-input-synaptics 1.1.2-1ubuntu7
Samsung NC10 11CA BIOS

When performing testing to reduce battery drain on my NC10 netbook, I've been tracking the CPU wake-ups. I was using gnome-power-statistics to track the CPU.

When the computer was idle, there would be around 40 wake-ups per second. While using the trackpad, there would be ~475 interrupts for the trackpad as well as ~150 additional interrupts per second generally increased (totalling around ~667/second). I even had one instance (not recorded unfortunately, where it was in the thousands). I compared this against other laptops running fresh 9.10 installation as well as desktops running it. Even using a USB mouse, they only generate tens or less of interrupts per second, not hundreds.

Since other laptops don't show this problem but the NC10 does, I'm guessing it's a cofiguration/setup issue.

I was looking at Bug #194489, and it seems to be perhaps related, but somewhat different. If I'm not using the touchpad, it doesn't generate spurious interrupts, but when I do use it, it seems to be way too high.

Jon Grossart (jon-grossart) wrote :
Jon Grossart (jon-grossart) wrote :
Jon Grossart (jon-grossart) wrote :
summary: - Samsung NC10 touchpad generates hundres of interrupts per minutes
+ Samsung NC10 touchpad generates hundres of interrupts per second
summary: - Samsung NC10 touchpad generates hundres of interrupts per second
+ Samsung NC10 touchpad generates hundreds of interrupts per second
description: updated
Robert Hooker (sarvatt) wrote :

Unfortunately that's normal behavior for touchpads that aren't wired via usb or ps2 internally (aka the majority of them that go through the EC). The only thing you can do really is lower the report rate via the psmouse module but don't be surprised if you still see ~300 wakeups/second at the lowest usable resolution.

Changed in xserver-xorg-input-synaptics (Ubuntu):
status: New → Invalid
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