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https://github.com/tylernguyen/x1c6-hackintosh.git
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68 lines
2.6 KiB
Text
68 lines
2.6 KiB
Text
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/*
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* On many modern hackintoshed thinkpads there are ofthen accesses to the 16-bit EC-field `HWAC`, which are mostly
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* not handled by battery-patches (f.e. those currated by @daliansky). Those accesses are (mostly) located in the _OWAK()
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* and/or _L17-ACPI-methods of the original DSDT.
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*
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* The ACPI-method OWAK() gets called by _WAK() on wake and crashes there on access of the HWAC-field, leaving the
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* machine in an undefined/unknown hw-state as the regular ACPI-wakeup-method, which re-setups the hardware after S3-sleep,
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* can't run to its end.
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*
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* Especially this bug is often not clearly visible as the kernel-ringbuffer (msgbuf) is, by default, only 4kb in size and flooded on wake
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* with many messages. This can be mitigated (up to 16kb) via `msgbuf`-boot-arg or patched by `DebugEnhancer.kext` by @acidanthera.
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* You can check the size of your msgbuf with `sysctl -a kern.msgbuf`.
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*
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* This SSDT is a simple solution for that problem and should be stable accross different Thinkpad models which suffer from this problem
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* as it fixes all accesses to the EC.HWAC-field at once.
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*
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* It repleaces all reads to HWAC with a call to XWAC(), returning a newly stitched 16-bit-field out of the
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* two overlayed 8-bit-fields `WAC0` & `WAC1`.
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*
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*
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* Background:
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* `Later releases of AppleACPIPlatform are unable to correctly access fields within the EC (embedded controller).
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* [...] DSDT must be changed to comply with the limitations of Apple's AppleACPIPlatform.
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*
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* In particular, any fields in the EC larger than 8-bit, must be changed to be accessed 8-bits at one time.
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* This includes 16, 32, 64, and larger fields.`
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* - @Rehabman, https://www.tonymacx86.com/threads/guide-how-to-patch-dsdt-for-working-battery-status.116102/
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*
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* Depends on /patches/OpenCore Patches/ HWAC.plist
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*/
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DefinitionBlock ("", "SSDT", 2, "tyler", "_HWAC", 0x00001000)
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{
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External (_SB.PCI0.LPCB.EC, DeviceObj)
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External (_SB.PCI0.LPCB.EC.HWAC, FieldUnitObj)
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Scope (\_SB.PCI0.LPCB.EC)
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{
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//
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// EC region overlay.
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//
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OperationRegion (ERAM, EmbeddedControl, 0x00, 0x0100)
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Field (ERAM, ByteAcc, NoLock, Preserve)
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{
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Offset (0x36),
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WAC0, 8, WAC1, 8,
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}
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// Method used for replacing reads to HWAC in _L17() & OWAK().
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Method (XWAC, 0, NotSerialized)
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{
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If (_OSI ("Darwin"))
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{
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Local0 = (WAC1 << 0x08)
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Local0 |= WAC0
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Return (Local0)
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}
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Else
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{
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Return (HWAC)
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}
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}
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}
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}
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// EOF
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