I think it changes quite rarely:

- Once it changed in Linux 4.7, in commit [1] (April 2016),
- Then it changed in Linux 5.1, in commit [2] (February 2019).

The Debian maintainer has a patch [3] that updates the SONAME version
when ABI changes.

There has been an attempt [4] to send that patch upstream, but
apparently upstream is not interested in that.

However, if ABI breaks once in three years, maybe it’s not that
difficult to maintain a patch?

[1]: 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ac5a181d065d74fb
[2]: 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ae2917093fb60bdc
[3]: 
https://salsa.debian.org/kernel-team/linux/blob/master/debian/patches/bugfix/all/cpupower-bump-soname-version.patch
[4]: https://patchwork.kernel.org/patch/9168711/

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https://bugs.launchpad.net/bugs/1215411

Title:
  libcpupower.so is not installed from linux-tools

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