diff options
| author | Woody Suwalski <wsuwalski@gmail.com> | 2022-02-09 16:05:09 -0500 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-02-16 18:17:16 +0100 |
| commit | bfe55a1f7fd6bfede16078bf04c6250fbca11588 (patch) | |
| tree | 545cb8633f3d7d852e52af9fb6c0e00babe7f56b /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | 754e0b0e35608ed5206d6a67a791563c631cec07 (diff) | |
ACPI: processor: idle: fix lockup regression on 32-bit ThinkPad T40
Add and ACPI idle power level limit for 32-bit ThinkPad T40.
There is a regression on T40 introduced by commit d6b88ce2, starting
with kernel 5.16:
commit d6b88ce2eb9d2698eb24451eb92c0a1649b17bb1
Author: Richard Gong <richard.gong@amd.com>
Date: Wed Sep 22 08:31:16 2021 -0500
ACPI: processor idle: Allow playing dead in C3 state
The above patch is trying to enter C3 state during init, what is causing
a T40 system freeze. I have not found a similar issue on any other of my
32-bit machines.
The fix is to add another exception to the processor_power_dmi_table[] list.
As a result the dmesg shows as expected:
[2.155398] ACPI: IBM ThinkPad T40 detected - limiting to C2 max_cstate. Override with "processor.max_cstate=9"
[2.155404] ACPI: processor limited to max C-state 2
The fix is trivial and affects only vintage T40 systems.
Fixes: d6b88ce2eb9d ("CPI: processor idle: Allow playing dead in C3 state")
Signed-off-by: Woody Suwalski <wsuwalski@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Cc: 5.16+ <stable@vger.kernel.org> # 5.16+
[ rjw: New subject ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions