[Bug 2138120] Re: x86: tsc: Fix TSC clock source being disabled when SNC is enabled causing fall back to less precise HPET

This bug is awaiting verification that the linux-azure-fde/6.8.0-1051.58
kernel in -proposed solves the problem. Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-noble-linux-azure-fde' to 'verification-done-
noble-linux-azure-fde'. If the problem still exists, change the tag
'verification-needed-noble-linux-azure-fde' to 'verification-failed-
noble-linux-azure-fde'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-noble-linux-azure-fde-v2 verification-needed-noble-linux-azure-fde

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https://bugs.launchpad.net/bugs/2138120

Title:
x86: tsc: Fix TSC clock source being disabled when SNC is enabled
causing fall back to less precise HPET

Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Noble:
Fix Released

Bug description:
[ Impact ]

* Performance degradation can occur after the first power cycle due
to using the less precise HPET instead of TSC.

[ Fix ]

* Clean cherry pick of :
b4bac27 x86/tsc: Use topology_max_packages() to get package number

[ Test Plan ]

* Compiled

[ Where problems could occur ]

* TSC regression.

[ Other Info ]

* This is a public version of: https://bugs.launchpad.net/bugs/2115101

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