I have a similar problem on my Acer Aspire 2920 with intel video card. The fan runs permanently. I don't have installed tracker but I have downgraded my intel driver to 2.4: https://wiki.edubuntu.org/ReinhardTartler/X/RevertingIntelDriverTo2.4 because I didn't have the problem with Intrepid Ibex. Nothing worked. The fan still runs permanently.

My harddisk gots a little bit too warm: 

$ sudo hddtemp /dev/sda
/dev/sda: WDC WD3200BEVT-22ZCT0: 56°C
$ sudo acpi -t
     Battery 0: Full, 100%
     Thermal 0: ok, 43.0 degrees C
     Thermal 1: ok, 45.0 degrees C

Top shows mainly xorg and firefox on the top:

 2993 root       20    0  329m  21m 9096 S    5  1.1   0:41.98 Xorg                                                             
 4024 christia  20   0  189m  69m  23m S    4  3.5   1:08.98 firefox                                                          
 4143 christia  20   0 34924  15m 9.8m S    3  0.8   0:03.11 gnome-terminal                                                   
 4703 root       20   0  2448 1196  912 R    1  0.1   0:00.61 top                                                              
 1759 root       15  -5     0    0    0 S    0  0.0   0:00.15 iwlagn                                                           
 3561 christia  20   0  7896 4712 2228 S    0  0.2   0:00.56 gconfd-2                                                         
 3796 christia  20   0  120m  33m  21m S    0  1.7   0:01.91 evolution                                                        

And powertop shows this:

  55,0% (423,3)       <interrupt> : PS/2 keyboard/mouse/touchpad 
  12,6% ( 96,8)      <Kernel IPI> : Rescheduling interrupts 
  10,6% ( 82,0)       <interrupt> : extra timer interrupt 
  10,1% ( 78,0)           firefox : futex_wait (hrtimer_wakeup) 
   2,2% ( 16,7)       <interrupt> : iwlagn 
   1,9% ( 14,4)              Xorg : schedule_hrtimeout_range (hrtimer_wakeup) 
   1,4% ( 11,0)           usplash : scan_async (ehci_watchdog) 
   1,4% ( 10,5)       <interrupt> : ata_piix 
   1,0% (  7,6)     <Kernel Kern> : hrtimer_start (tick_sched_timer)
   0,9% (  7,0)   USB Gerät  1-1 : USB2.0-CRW (Generic)
   0,8% (  6,0)       <interrupt> : ehci_hcd:usb1, uhci_hcd:usb3
   0,5% (  4,2)       <interrupt> : acpi
   0,3% (  2,4)              Xorg : hrtimer_start (it_real_fn)
   0,2% (  1,8)   gnome-screensav : schedule_hrtimeout_range (hrtimer_wakeup)
   0,1% (  1,0)    NetworkManager : tg3_open (tg3_timer)
   0,1% (  1,0)    <Kernel Modul> : queue_delayed_work (delayed_work_timer_fn)
   0,1% (  1,0)     <Kernel Kern> : neigh_table_init_no_netlink (neigh_periodic_timer)
   0,1% (  1,0)   hald-addon-stor : schedule_hrtimeout_range (hrtimer_wakeup)

This is the hardware of the Aspire 2920:

00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 03)
00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 (rev 03)
00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 2 (rev 03)
00:1c.2 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 3 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f3)
00:1f.0 ISA bridge: Intel Corporation 82801HEM (ICH8M) LPC Interface Controller (rev 03)
00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) IDE Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA AHCI Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 03)
02:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5787M Gigabit Ethernet PCI Express (rev 02)
04:00.0 Network controller: Intel Corporation PRO/Wireless 4965 AG or AGN [Kedron] Network Connection (rev 61)

Regards,
Christian