SRU: https://lists.ubuntu.com/archives/kernel-team/2021-July/122353.html
(impish, oem-5.13)

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https://bugs.launchpad.net/bugs/1933617

Title:
  [ADL-S] Broken PMU hardware detected, using software events only.

Status in HWE Next:
  In Progress
Status in linux package in Ubuntu:
  In Progress
Status in linux-oem-5.13 package in Ubuntu:
  Invalid
Status in linux source package in Focal:
  Won't Fix
Status in linux-oem-5.13 source package in Focal:
  In Progress

Bug description:
  [Summary]
  Broken PMU hardware detected, using software events on

  log
  04 16:04:26 u-Inspiron kernel: Broken PMU hardware detected, using software 
events only.
  04 16:04:26 u-Inspiron kernel: Failed to access perfctr msr (MSR 18e is 
ffffffffffffffff)
  04 16:04:26 u-Inspiron kernel: rcu: Hierarchical SRCU implementation.
  04 16:04:26 u-Inspiron kernel: NMI watchdog: Perf NMI watchdog permanently 
disabled
  04 16:04:26 u-Inspiron kernel: smp: Bringing up secondary CPUs ...
  04 16:04:26 u-Inspiron kernel: x86: Booting SMP configuration:

  [Reproduce Steps]
  1. Boot to Ubuntu with 5.13 kernel
  2. Intel PMU driver report Broken HW detected
  3. journalctl -k

  [Results]
  Expected: PMU hardware works normally
  Actual: PMU borken hardware detected

  --
  Upstream bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=213443

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