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I have an Intel wireless card driven by iwlwifi, and I can see the following message in dmesg:

iwlwifi 0000:03:00.0: loaded firmware version build 42301

But how do I know which firmware is loaded?

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The answer is build 42301. But I do not think that is your real question? –  Nils Jul 19 '12 at 12:21
I suspect it may not load a firmware every time the system boots up, but only reports what firmware version is running on the ethernet card. –  fduff Jul 19 '12 at 12:53

2 Answers 2

up vote 3 down vote accepted

The iwlwifi driver loads the microcode file for your wifi adapter at startup. If you want to know which one of the /usr/lib/firmware/.ucode* files is loaded you can use something like this script


./ucode.py /usr/lib/firmware/*.ucode

and compare the output to your dmesg message.

I had to make some minor adjustments to that script... remove the comma on line 28, print formatting (lines 28, 34, 42, 46, 47) and also on line 42:

-  print ("ver %u.%u.%u.%u%s") % (major, minor, api, serial, readable)
+  print ("ver %u.%u.%u.%u%s" % (major, minor, api, serial, readable))
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modinfo iwlwifi

and will see 'firmware:' section, or even just directly:

modinfo -F firmware iwlwifi

This is show you all firmware's which use the such module.

Also you can try to review line before this, it may contain info like 'firmware: requesting ...'

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modinfo -F firmware iwlwifi lists all possible firmwares (in the case of iwlwifi around 20) –  Martin Vegter Apr 13 '14 at 14:20

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