thermal throttling on xps13: unchecked MSR access error
From: Linus Torvalds
Date: Tue Dec 13 2022 - 19:39:09 EST
Hmm.
I don't think I've seen this before on my trusty old x86 laptop (XPS
13 9380 - it's a few years old)
unchecked MSR access error: WRMSR to 0x1b1
(tried to write 0x0000000004000aa8)
at rIP: 0xffffffff8b8559fe (throttle_active_work+0xbe/0x1b0)
I'm blaming one of
930d06bf071a ("thermal: intel: Protect clearing of thermal status bits")
6fe1e64b6026 ("thermal: intel: Prevent accidental clearing of HFI status")
with no real reason apart from being the last commit to touch that
function, but also when it started happening.
The first kernel I see this for is 6.1.0-03225-g764822972d64, but
honestly, it's possible that it has happened before too, and the real
issue is that the machine just happened to be hot and throttling at
bootup and/or I just didn't notice.
The CPU in this thing is a
Intel(R) Core(TM) i7-8565U CPU @ 1.80GHz
which hopefully makes somebody go "Ahh, yes, I missed that case".
I don't *think* the MSR access checking has changed, but maybe it did,
and I'm barking up the wrong tree.
Anybody?
Linus