Issue #121 has been updated by Patrick Rudolph.
I compared the vendor ACPI code for T520 and T530:
- The T520 is missing _CST entries, thus the C-states are reported in FADT. I
couldn't find a firmware dump that has a FADT.
- The T530 has _CST, but the latencies are higher: For C3 148usec, vs
Issue #121 has been updated by Patrick Rudolph.
Does limiting the max C-state in MSR MSR_PKG_CST_CONFIG_CONTROL also work
around the issue?
What setting is being used on vendor firmware for MSR
MSR_PKG_CST_CONFIG_CONTROL?
Currently the code doesn't check if the processor supports C6/C3 sleep
Issue #121 has been updated by Anastasios Koutian.
File defconfig added
The issue is resolved for me after doing the following:
a) Change motherboards from FRU 04W2049 (dGPU + iGPU) to FRU 04W2045 (iGPU).
b) Update coreboot to 4.21 with EDK II (defconfig is attached).
System has been stable
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