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In Linux, you can try this:

grep 'at EC' /proc/asound/cards

Sample output:

ThinkPad Console Audio Control at EC reg 0x30, fw 7WHT19WW-3.6

7WHT19WW is the version in different notation, use search engine to find out regular version - in this case it's a 1.06 for x200 tablet

Alternatively, if dmidecode is available, run the following command (as root) to find the currently flashed BIOS version:

dmidecode -s bios-version

On a T400 running the latest BIOS this would give 7UET94WW (3.24 ) as result.