How does the linux kernel choose which firmware version to load?

I installed the latest firmware for my network card N-7260 from . I am using Ubuntu 14.04 with kernel version 3.14.01 from the kernel's team ppa. Here is a list of firmware I have in /lib/firmware:

$ ls /lib/firmware/*iwl*7260* /lib/firmware/iwlwifi-7260-8.ucode /lib/firmware/org.iwlwifi-7260-7.ucode /lib/firmware/iwlwifi-7260-9.ucode /lib/firmware/org.iwlwifi-7260-8.ucode 

Right now it seems that version 9 does not load. If I remove version 8, I see on boot the following message:

sudo dmesg | grep iwl [sudo] password for ozubu: [ 6.121743] iwlwifi 0000:02:00.0: irq 62 for MSI/MSI-X [ 6.133208] iwlwifi 0000:02:00.0: Direct firmware load failed with error -2 [ 6.133211] iwlwifi 0000:02:00.0: Falling back to user helper [ 6.311794] iwlwifi 0000:02:00.0: Direct firmware load failed with error -2 [ 6.311799] iwlwifi 0000:02:00.0: Falling back to user helper [ 6.324940] iwlwifi 0000:02:00.0: request for firmware file 'iwlwifi-7260-7.ucode' failed. [ 6.324950] iwlwifi 0000:02:00.0: no suitable firmware found! 

So, my question is:

How do I tell linux it should load iwlwifi-7260-9.ucode ?

update

Oddly enough, the firmware version loaded now is 8, at least according to dmesg:

$ sudo dmesg | grep iwl [sudo] password for ozubu: [ 18.970651] iwlwifi 0000:02:00.0: irq 62 for MSI/MSI-X [ 19.012648] iwlwifi 0000:02:00.0: loaded firmware version 22.24.8.0 op_mode iwlmvm [ 19.315472] iwlwifi 0000:02:00.0: Detected Intel(R) Wireless N 7260, REV=0x144 [ 19.315899] iwlwifi 0000:02:00.0: L1 Disabled; Enabling L0S [ 19.316118] iwlwifi 0000:02:00.0: L1 Disabled; Enabling L0S [ 19.523132] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs' [ 23.100268] iwlwifi 0000:02:00.0: L1 Disabled; Enabling L0S [ 23.100484] iwlwifi 0000:02:00.0: L1 Disabled; Enabling L0S 

3 Answers

The firmware version that is requested is written into the driver code. As you can see, the particular version if iwlwifi that you are using requests -7 firmware. It can't find it and ends in an error. You can see this in modinfo iwlwifi:

$ modinfo iwlwifi filename: /lib/modules/3.13.0-24-generic/kernel/drivers/net/wireless/iwlwifi/iwlwifi.ko license: GPL author: Copyright(c) 2003-2013 Intel Corporation <> version: in-tree: description: Intel(R) Wireless WiFi driver for Linux <snip> firmware: iwlwifi-7260-7.ucode 

What does yours report? Have you tried re-naming the -9 firmware as -7, after backing up, of course?

I actually believe that, for 7260 devices, modinfo suggests -7 but the driver actually uses -8. I am unaware of any driver version that calls for -9. Perhaps kernel version 3.15-xx.

I think it depends on your kernel:

• 3.10+ uses firmware -7
• 3.13+ uses firmware -8
• 3.14.9+ uses firmware -9
• 3.17+ uses firmware -10

Source:

Ubuntu 14.04 is 3.13 so loads 22.24.8.0.

Ubuntu 14.10 is 3.16 so loads 25.228.9.0.

I can connect with both, though the first was flaky for me... speedtest.net scores were 2-3Mbps down versus 25Mbps down with the second. YMMV.

Same here... but with stock kernel

$ uname -a Linux prato 3.13.0-30-generic #55-Ubuntu SMP Fri Jul 4 21:40:53 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux $ modinfo iwlwifi | grep 7260 firmware: iwlwifi-7260-7.ucode 

But will only load if I download and install 7260-8 from

Maybe somebody forgot to change something in the driver info. My installation had -7 and -9, oddly enough.

Luckily it works with the -8, even with monitor mode.

Hope it helps!