https://bugzilla.kernel.org/show_bug.cgi?id=218652
Bug ID: 218652
Summary: acpitz sensors regression on Linux 6.7+ on Framework
16
Product: ACPI
Version: 2.5
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P3
Component: Power-Thermal
Assignee: acpi_power-ther...@kernel-bugs.osdl.org
Reporter: qsm...@gmail.com
Regression: No
After upgrading from 6.1.78 to 6.8.1, I discovered that the `acpitz-*` sensors
had gone missing. I believe that was caused by this commit:
https://github.com/torvalds/linux/commit/f04256a8f7de2c13619b636cec1109e596804229
because the kernel is now logging at boot:
```
ACPI: thermal: [Firmware Bug]: Invalid critical threshold (-274000)
ACPI: thermal: [Firmware Bug]: No valid trip points!
ACPI: thermal: [Firmware Bug]: Invalid critical threshold (-274000)
ACPI: thermal: [Firmware Bug]: No valid trip points!
ACPI: thermal: [Firmware Bug]: Invalid critical threshold (-274000)
ACPI: thermal: [Firmware Bug]: No valid trip points!
ACPI: thermal: [Firmware Bug]: Invalid critical threshold (-274000)
ACPI: thermal: [Firmware Bug]: No valid trip points!
```
If I’m reading the laptop's DSDT correctly, the `_HOT` threshold is reported as
0x1218 (463.2 degrees) and the `_CRT` threshold is 0x12E0 (483.2 degrees). The
old code would always create the thermal zones, but after that commit the
kernel ignores any threshold above 448 degrees as implausibly high, and if
there were no valid thresholds it ignores the whole thermal zone.
Even if there are no plausible thresholds, the thermal zone should still be
created so the sensor values can be read.
I reported this in the Framework forum at
https://community.frame.work/t/firmware-bug-acpi-table-error-causes-missing-sensors-on-linux-6-7/47767,
but Mario Limonciello from AMD asked me to file an upstream bug since the
commit message says "No intentional functional impact."
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