Wifi module (driver) does not successfully load. WLAN card not initialized and activated.

Issue

• The module fails to load. The dmesg output:

Intel(R) Wireless WiFi driver for Linux, in-tree:
Copyright(c) 2003-2013 Intel Corporation
iwlwifi 0000:25:00.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
iwlwifi 0000:25:00.0: setting latency timer to 64
  alloc irq_desc for 40 on node -1
  alloc kstat_irqs on node -1
iwlwifi 0000:25:00.0: irq 40 for MSI/MSI-X
iwlwifi 0000:25:00.0: firmware: requesting iwlwifi-6000g2a-6.ucode
ACPI: resource (null) [io  0x0428-0x042f] conflicts with ACPI region PMIO [io 0x400-0x47f]
ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
ACPI: resource (null) [io  0x0500-0x053f] conflicts with ACPI region GPIO [io 0x500-0x563]
ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
lpc_ich: Resource conflict(s) found affecting gpio_ich
sd 0:0:0:0: Attached scsi generic sg0 type 0
sr 1:0:0:0: Attached scsi generic sg1 type 5
iwlwifi 0000:25:00.0: loaded firmware version 18.168.6.1 op_mode iwldvm
mac80211: Unknown symbol unregister_inet6addr_notifier
mac80211: Unknown symbol register_inet6addr_notifier
iwlwifi 0000:25:00.0: failed to load module iwldvm (error 256), is dynamic loading enabled?