Intel works with periodic releases of the iwlwifi driver that are tested with a specific combination of components. They are called LinuxCore releases and are numbered sequentially, e.g. LinuxCore11 is the latest stable release as of May 2015. These releases can be seen as snapshots of the development trees (including upstream) that are tested thoroughly together with a specific version of the firmware and userspace components (i.e. hostap).
The components used in each release are specific stabilization versions of the following:
If you use a well maintained distribution, your device should be supported out of the box. If your device doesn't work at all (you can't even see it in the interface list), then it might mean that your kernel is too old or that you don't have the proper firmware. You can contact your distribution to have them fix this. In the meantime, you can use the backport tree to make your device work. Make sure to install the proper firmware as well. If your device works minimally (you can see it in the interface list), but you experience issues, please check the support section. You can also use the backport tree to check if the issue you are suffering from has been fixed in different releases. The backport tree is also an excellent tool to bisect regressions. Note that when you install the backport drivers, you disallow the usage of any WLAN device that is not supported by iwlmvm. To check if your device is supported by iwlmvm, please check here in the module column.
If you are building your own system and you know that the only WLAN device you'll have is from Intel, the backport tree is what you need. You'll be able to get a driver / firmware combo that has been validated together. As a rule of thumb, you should take the latest Core version available.
The fact that Intel published a backport tree for its WLAN drivers doesn't impact its commitment to upstream all the code to the mainline kernel. It simply allows users who can't choose their kernel to work with a more recent driver. The backport tree allows us to provide a combo of the driver / firmware that has been fully validated. For a simple reason of capacity, we cannot test as thoroughly all the kernel versions / firmwares / devices matrix. There is code in the backport tree that is not in the mainline kernel, but this is transient. Eventually, all the code in the backport tree will reach mainline unless it has dependencies (platform drivers etc…).
A Core release includes all the components described above. Here is the way to match all these components together. backport, iwlwifi, mac80211 and cfg80211 come from the backport-iwlwifi git repository. You'll find the relevant Core branches there (release/LinuxCoreX). For all the Core releases, the master branch hostap should be taken. The firmware can be found in iwlwifi's linux-firmware clone. Please don't open bugs on versions that are advertised as End of life. Here is the table to help you finding the right version of the different components:
|Core release||status||backport-iwlwifi||Firmware API number|
|Core5||End of life||LinuxCore5||-9.ucode 7260 3160 7265|
|Core7||End of life||LinuxCore7||-10.ucode 7260 3160 7265 7265D|
|Core9||End of life||LinuxCore9||-12.ucode 7260 3160 7265 7265D|
|Core10||End of life||LinuxCore10||-13.ucode 7260 3160 7265 7265D8260|
|Core11||End of life||LinuxCore11||-14.ucode 7260 3160 7265 7265D8260|
|Core12||End of life||LinuxCore12||-15.ucode 7260 3160 7265 7265D8260|
|Core13||End of life||LinuxCore13||-16.ucode 7260 3160 7265 7265D8260|
|Core14||Last version for 7260, 7265 and 3160||LinuxCore14||-17.ucode 7260 3160 7265 7265D8260|
|Core15||End of life||LinuxCore15||-18.ucode 7265D8260|
|Core16||End of life||LinuxCore16||-19.ucode 7265D8260|
|Core17||End of life||LinuxCore17||-20.ucode 7265D8260|
|Core18||End of life||LinuxCore18||-21.ucode 7265D826031688265|
|Core19||End of life||LinuxCore19||-22.ucode 7265D826031688265|
|Core24||End of life||LinuxCore24||-27.ucode 7265D826031688265|
|Core26||Last version for 3168 and 7265D||LinuxCore26||-29.ucode 7265D3168|
|Core30||End of life||LinuxCore30||-33.ucode 92609000|
|Core33||Last version for 8260 and 8265||core33||-36.ucode 82608265|
iwlwifi implements a few vendor commands that are available in this tree. We strongly suggest that you disable the vendor commands Kconfig option (CPTCFG_IWLMVM_VENDOR_CMDS). Enabling vendor commands without actually sending them can cause incompatibility with certain versions of the supplicant (due to a supplicant bug) or too aggressive Multicast frames filtering. Note that CPTCFG_IWLMVM_VENDOR_CMDS is enabled by default and needs to be explicitly disabled.
In order to install the driver, you'll need to download the sources:
git clone https://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/backport-iwlwifi.git -b release/LinuxCore28
Then, you can make the sources with vendor commands disabled:
make defconfig-iwlwifi-public sed -i 's/CPTCFG_IWLMVM_VENDOR_CMDS=y/# CPTCFG_IWLMVM_VENDOR_CMDS is not set/' .config make -j4
Now it is time to install the modules you built
sudo make install
Now you can reboot.
The support model for Core releases is the same as for the mainline kernel described in the support section. We will try to assist for any pure WLAN bug, but please take into account that platform integration isn't trivial: it can cause random issues. We also don't commit to work on all the platforms.