johnfanv2
commented
1 year ago It failed because it expected the ID of the embedded controller to be 0x8227, but it read 0x5576. This model HACN BIOS firmware also does not seems to supported by the Windows tools LegionFanControl. It is one of the rare cases.
Maybe this model uses another chip. If you want to try to find the addresses in this chip, I could guide you through. It roughly works like that. Either, it can be easy, because you will find the embedded controller will use the same program/memory layout. Or, it is more complicated because it is completely different.
Disassembling ACPI tables
# Install requiered tools
sudo apt install acpica-tools# Create folder for all the new files
mkdir acpi_re
cd acpi_re
# List ACPI tables and copy them
ls /sys/firmware/acpi/tables/
sudo cp --no-preserve=mode /sys/firmware/acpi/tables/*SDT* .
# Disassemble tables to output DSDT.dsl
iasl -e SSDT* -d DSDTThen upload files.
Find Mapped Memory Address of Embedded Controller
Find the part for the embedded controller. It will contain something like this.
Device (EC0)
Name (_HID, EisaId ("PNP0C09") /* Embedded Controller Device */) // _HID: Hardware ID
Name (_UID, One) // _UID: Unique IDThen find the regions used by the embedded controller. There are lots of other regions, but only these are interesting that are within the scope/braces of the embedded controller.
You will find something similar to this:
OperationRegion (ERAM, EmbeddedControl, Zero, 0xFF)
OperationRegion (ECMS, SystemIO, 0x72, 0x02)
OperationRegion (ERAX, SystemMemory, 0xFE00D400, 0xFF)
- mapped into memory at 0xFE00D400
- region with most of the fields defined
OperationRegion (ECB2, SystemMemory, 0xFF00D520, 0xFF)
- mapped into memory at 0xFF00D520
- region with most of the fields definedThis will show that registers/memory of the embedded controller is mapped to (CPU) memory address space. Note that these regions described in the ACPI tables above are only the registers/memory used directly in ACPI.
Often, much more registers/memory of the embedded controller are mapped to (CPU). Usually, these are before or after the regions mentioned in the ACPI tables.
Observing what Changes to Associate Memory Addresses With Functions
Now we can read the memory mapped regions. Then we change something, e.g.
- increase fan speed by increasing CPU load
- increase temperature by increasing CPU load
- change power mode by pressing Fn + Q, which should also change fan curves in hardware
...
cobaltbee
olilag
Hello, thanks for the great project, I couldn't believe my eyes when I saw the post on r/LenovoLegion, and I hope mods will sticky your thread soon for more visibilty.
I have a Legion S7-15ACH6 - Type 82K8 aka 2021 Slim 7 that unfortunately has problems loading the module. I have tried the 'forceloadmodule' option mentioned in another thread here, but no luck. Let me know if you need any further details from me, glad to provide whatever you need.
Info about the system:
Top of 'dmesg'