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[Slavius <slavomir.danas@xxxxxxxxx>]

Public bug reported:

Binary package hint: xserver-xorg-video-intel

running fresh installed and updated:
Description:	Ubuntu 9.10
Release:	9.10

package details:
xserver-xorg-video-intel:
  Installed: 2:2.9.0-1ubuntu2
  Candidate: 2:2.9.0-1ubuntu2
  Version table:
 *** 2:2.9.0-1ubuntu2 0
        500 http://archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status

hardware:
laptop HP ProBook 4510s

lspci:
00:00.0 Host bridge [0600]: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub [8086:2a40] (rev 07)
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07)
00:02.1 Display controller [0380]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a43] (rev 07)
00:1a.0 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 [8086:2937] (rev 03)
00:1a.1 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 [8086:2938] (rev 03)
00:1a.2 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 [8086:2939] (rev 03)
00:1a.7 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 [8086:293c] (rev 03)
00:1b.0 Audio device [0403]: Intel Corporation 82801I (ICH9 Family) HD Audio Controller [8086:293e] (rev 03)
00:1c.0 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 [8086:2940] (rev 03)
00:1c.1 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 [8086:2942] (rev 03)
00:1c.4 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 5 [8086:2948] (rev 03)
00:1c.5 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 6 [8086:294a] (rev 03)
00:1d.0 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 [8086:2934] (rev 03)
00:1d.1 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 [8086:2935] (rev 03)
00:1d.2 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 [8086:2936] (rev 03)
00:1d.7 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 [8086:293a] (rev 03)
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 Mobile PCI Bridge [8086:2448] (rev 93)
00:1f.0 ISA bridge [0601]: Intel Corporation ICH9M LPC Interface Controller [8086:2919] (rev 03)
00:1f.2 SATA controller [0106]: Intel Corporation ICH9M/M-E SATA AHCI Controller [8086:2929] (rev 03)
02:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g [14e4:4315] (rev 01)
44:00.0 Ethernet controller [0200]: Marvell Technology Group Ltd. Device [11ab:436c] (rev 10)


problem description:
i915 causes huge amount of wakeups and keeps my cpu in c0 state most of the time making the laptop battery die in less than 2 hours (in contrast to >5 hours in windows on the same machine) while running only gnome-terminal with powertop open on the desktop.  I've also disabled secondary core to prevent "Rescheduling interrupts - kernel IPI" appear in powertop. 

powertop 1.11:
Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        (75.8%)
C0                0.0ms ( 0.0%)
C1 mwait          0.0ms ( 0.0%)
C3 mwait          1.5ms (24.2%)


Wakeups-from-idle per second : 161.8    interval: 10.0s
Power usage (ACPI estimate): 19.0W (0.6 hours) (long term: 18.2W,/0.7h)

Top causes for wakeups:
  68.7% (528.1)       <interrupt> : i915@pci:0000:00:02.0 
  11.5% ( 88.5)     <kernel core> : hrtimer_start_range_ns (tick_sched_timer) 
  11.1% ( 85.6)       <interrupt> : PS/2 keyboard/mouse/touchpad 
   2.5% ( 19.6)       <interrupt> : uhci_hcd:usb4, eth2, HDA Intel 
   1.5% ( 11.7)              Xorg : hrtimer_start_range_ns (hrtimer_wakeup) 
   1.2% (  9.6)           firefox : hrtimer_start_range_ns (hrtimer_wakeup)
   0.8% (  6.0)     <kernel core> : add_timer (wl_timer)
   0.7% (  5.0)          gnome-do : hrtimer_start_range_ns (hrtimer_wakeup)
   0.6% (  4.9)         syndaemon : hrtimer_start_range_ns (hrtimer_wakeup)
   0.3% (  2.2)       <interrupt> : ahci
   0.2% (  1.5)              Xorg : hrtimer_start (it_real_fn)
   0.1% (  1.1)       gnome-panel : hrtimer_start_range_ns (hrtimer_wakeup)
   0.1% (  1.0)              ntpd : hrtimer_start_range_ns (it_real_fn)
   0.1% (  0.9)              Xorg : queue_delayed_work (delayed_work_timer_fn)
   0.1% (  0.7)     <kernel core> : hrtimer_start (tick_sched_timer)
   0.1% (  0.5)              init : neigh_periodic_timer (neigh_periodic_timer)

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

-- 
i915 causes huge amount of wakeups in powertop in karmic
https://bugs.launchpad.net/bugs/495596
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