[Bug 625914] [NEW] psmouse excessive wakeups touchpad

[Peter Silva]

Public bug reported:

Seeing unsatisfying battery usage, on an AMD nile platform notebook.

using powertop, I see that whenever the touchpad is used, there are
hundreds of wakeups per second.  to estimate worst case impact, I play
with the touchpad continuously for ten seconds to see a refresh.
disabling the touchpad and repeating using an ordinary mouse results in
a drop in power consumption of on the order of a 1 watt.  (went from
16.5 to 16.8 down to under 16)

with touchpad active:

 Detailed C-state information is not P-states (frequencies)
                                        1.71 Ghz     0.0%
                                        1300 Mhz     0.0%
                                         800 Mhz   100.0%


Wakeups-from-idle per second : 751.8    interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
  57.1% (440.4)   PS/2 keyboard/mouse/touchpad interrupt
  22.4% (172.9)   [ehci_hcd:usb1, ehci_hcd:usb2, ehci_hcd:usb3, ath9k] <interrup
   3.9% ( 30.3)D  chromium-browse
   4.1% ( 31.5)   [kernel scheduler] Load balancing tick
   2.7% ( 21.0)   USB device  1-5 : USB2.0-CRW (Generic)
   1.3% ( 10.0)   pulseaudio


result with mouse:

< Detailed C-state information is not P-states (frequencies)
                                        1.71 Ghz     0.0%
                                        1300 Mhz     0.0%
                                         800 Mhz   100.0%


Wakeups-from-idle per second : 324.4    interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
  41.1% (159.0)   [ehci_hcd:usb1, ehci_hcd:usb2, ehci_hcd:usb3, ath9k] <interrup
  10.1% ( 39.0)   USB device  4-1 : USB Optical Mouse (Logitech)
   8.4% ( 32.6)   [kernel scheduler] Load balancing tick
   8.2% ( 31.8)   [ohci_hcd:usb4, ohci_hcd:usb5, ohci_hcd:usb6, radeon] <interru
   6.4% ( 24.7)   chromium-browse
   6.3% ( 24.5)   USB device  1-5 : USB2.0-CRW (Generic)


This is using mouse extensively.  the touchpad seems to remain active for long periods when it should be idle.
noticed this patch: http://www.lesswatts.org/projects/powertop/known.php#appletouch
suspect something similar is necessary for psmouse driver.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

-- 
psmouse excessive wakeups touchpad
https://bugs.launchpad.net/bugs/625914
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