- /proc/cpuinfo shows only the basic cpu clock speed since kernel 4.13
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=
51204e0639c49ada02fd823782ad673b6326d748
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=
f8475cef90082bf0902ddab106112de130d90395