Same issue with LED for my inspiron 1525, but I am also having an issue whereby shutdown hangs - apparently in relation to the 3945 card. The shutdown continues if I turn off the wifi switch.

kern.log:

Nov  1 23:31:55 rincewind kernel: [ 3469.245405] iwl3945: Radio Frequency Kill Switch is On:
Nov  1 23:31:55 rincewind kernel: [ 3469.245411] Kill switch must be turned off for wireless networking to work.
Nov  1 23:31:59 rincewind kernel: [ 3473.860178] wlan0: No ProbeResp from current AP 00:18:4d:df:f8:08 - assume out of range
Nov  1 23:31:59 rincewind kernel: [ 3473.885188] iwl3945: Error sending REPLY_LEDS_CMD: iwl3945_enqueue_hcmd failed: -5
Nov  1 23:32:00 rincewind kernel: [ 3474.490106] iwl3945: WARNING: Requesting MAC access during RFKILL wakes up NIC
Nov  1 23:32:00 rincewind kernel: [ 3474.493213] iwl3945: MAC is in deep sleep!
Nov  1 23:32:00 rincewind kernel: [ 3474.540005] iwl3945: WARNING: Requesting MAC access during RFKILL wakes up NIC
Nov  1 23:32:00 rincewind kernel: [ 3474.543981] iwl3945: MAC is in deep sleep!
Nov  1 23:32:00 rincewind kernel: [ 3474.599863] iwl3945: WARNING: Requesting MAC access during RFKILL wakes up NIC
Nov  1 23:32:00 rincewind kernel: [ 3474.603852] iwl3945: MAC is in deep sleep!
Nov  1 23:32:00 rincewind kernel: [ 3474.763629] iwl3945: WARNING: Requesting MAC access during RFKILL wakes up NIC
Nov  1 23:32:00 rincewind kernel: [ 3474.780171] iwl3945 0000:0b:00.0: PCI INT A disabled

uname -a:

Linux rincewind 2.6.27-7-generic #1 SMP Thu Oct 30 04:12:22 UTC 2008 x86_64 GNU/Linux

lspci:

00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub (rev 0c)
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c)
00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c)
00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 (rev 02)
00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 02)
00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 02)
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 (rev 02)
00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 2 (rev 02)
00:1c.4 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 5 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f2)
00:1f.0 ISA bridge: Intel Corporation 82801HEM (ICH8M) LPC Interface Controller (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) IDE Controller (rev 02)
00:1f.2 SATA controller: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA AHCI Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 02)
02:09.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller (rev 05)
02:09.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 22)
02:09.2 System peripheral: Ricoh Co Ltd R5C843 MMC Host Controller (rev 12)
02:09.3 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 12)
02:09.4 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev ff)
09:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8040 PCI-E Fast Ethernet Controller (rev 12)
0b:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)