https://bugzilla.kernel.org/show_bug.cgi?id=150841
Bug ID: 150841
Summary: sysfs is broken due to LoadTable("OEM"...)
Product: ACPI
Version: 2.5
Kernel Version: All
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: ACPICA-Core
Assignee: [email protected]
Reporter: [email protected]
Regression: No
We are running into an issue in Linux with using dynamic tables and I was
hoping you could help or shed some light on the issue.
We are creating dynamic OEMx tables based on OS capabilities from _OSC method
for CPU power management.
During boot time, we patch and install these OEMx tables based on certain setup
questions so that they are in ACPI memory and linked in with RSDT/XSDT.
In the ASL, we will load them using LoadTable:
LoadTable("OEM1", "INTEL", "CPU EIST",,,) // Dynamically load the
CPUEIST table
However, in Linux, it is generating a blank OEM12 file at the location:
/sys/firmware/acpi/tables/dynamic/OEM12
If we use an acpidump tool to dump ACPI tables, we will get an error:
/sys/firmware/acpi/tables/dynamic/OEM12 Could not get ACPI table at index 36,
AE_BAD_HEADERTool's
/sys/firmware/acpi/tables/OEM1 is present and functionality wise, it is working
as expected.
Any ideas why this table is generated with no data? Is this an issue with
Linux by chance or is there a different way to program our ASL to avoid this?
We have protections around the LoadTable calls to avoid loading them multiple
times.
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