2.5 KiB
Fixing USB: Manual
Finding the ACPI table
So unlike the previous SSDT creations, we're not going to be working with the DSDT, instead we're gonna be looking through the entire ACPI dump and trying to find the bad table.
So to get these tables:
- Run DEBUG version of OpenCore with
SysReportenables - or running acpidump.exe in Windows
- note that the files dumped will need to be renamed from
.datto.aml
- note that the files dumped will need to be renamed from
Once you've done that, you should have a full folder similar to the below:
As you can see, we've got a bunch of ACPI tables that we need to decompile first. To make things a bit simpler, we only need to decompile the SSDTs. The rest of the tables are unneeded.
To run a mass decompile:
/path/to/iasl/ /path/to/SSDT-1 /path/to/SSDT-2 ...
And so on... Don't worry about any compiler warning's, we won't be recompiling most of those files.
Once done, you should get something like the following:
Now comes the fun part: Finding our bad SSDT
As per Intel's engineering sample SSDTs, the OEM table ID will generally start with xh_ with some string after it(in Intel's example, they use "xh_nccrb"):
So we'll want to search for xh_ inside the DefinitionBlock of the SSDTs, luckily they will only be in the SSDTs so makes searching far shorter.
For our example, we'll be using an Asus ROG MAXIMUS XII EXTREME as our example. For a quick search, we've found our SSDT with xh_ is SSDT-6! Specifically "xh_cmsd4"
Edits to the SSDT
Now comes the fun part, writing our own custom SSDT. For this we'll first want to grab a modified copy of Intel's engineering SSDT:
Now once you open it up, you should get the following:
Compiling the SSDT
With the SSDT done, you're now ready to compile the SSDT!
Wrapping up
Once you're done making your SSDT, either head to the next page to finish the rest of the SSDTs or head here if you're ready to warp up: