ondemand 'regression' after firmware upgrade on MBA
From: Daniel Wagner
Date: Thu Oct 11 2012 - 05:15:20 EST
Hi,
I updated the firmware of Macbook Air Mid 2012 model to
version 2.5. The changelog from Apple
http://support.apple.com/kb/DL1592
"This update fixes an issue where Turbo Boost does not
activate when using Boot Camp"
indicates that they changed stuff on the ACPI tables.
Now I have noticed that after updating the firmware the CPU
frequency stays at 800 MHz even when compiling the kernel.
I tried to debug what's going on. Here is my current results
and I am kind of stuck how to proceed from here. Any ideas to
go on from here?
cheers,
daniel
And here the results:
(complete logs and tables are here: http://www.monom.org/misc/acpi/ )
- When I change the governor to 'conservative' the CPU will
be run eventually on max speed.
- With lowering the threshold from 95 to 70, I see again clock
speed changes
echo 70 > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold
- The ACPI tables seem to have changed. Unfortunately, I have
only retrieved the new one. I have an old dmesg
output (3.6.0-rc6+) compared with new dmesg output (3.6.0-rc7+):
Old:
ACPI: RSDP 000000008ad8e014 00024 (v02 APPLE )
ACPI: XSDT 000000008ad8e1c0 000B4 (v01 APPLE Apple00 00000000 01000013)
ACPI: FACP 000000008ad8c000 000F4 (v04 APPLE Apple00 00000000 Loki 0000005F)
ACPI: DSDT 000000008ad82000 04708 (v01 APPLE MacBookA 00050001 INTL 20100915)
ACPI: FACS 000000008ad1c000 00040
ACPI: HPET 000000008ad8b000 00038 (v01 APPLE Apple00 00000001 Loki 0000005F)
ACPI: APIC 000000008ad8a000 000BC (v02 APPLE Apple00 00000001 Loki 0000005F)
ACPI: SBST 000000008ad88000 00030 (v01 APPLE Apple00 00000001 Loki 0000005F)
ACPI: ECDT 000000008ad87000 00053 (v01 APPLE Apple00 00000001 Loki 0000005F)
ACPI: SSDT 000000008ad7f000 001EE (v01 APPLE SataAhci 00001000 INTL 20100915)
ACPI: SSDT 000000008ad7e000 00024 (v01 APPLE SmcDppt 00001000 INTL 20100915)
ACPI: SSDT 000000008ad78000 00D74 (v01 APPLE UsbSdPpt 00001000 INTL 20100915)
ACPI: SSDT 000000008ad77000 00159 (v02 APPLE IGHda 00001000 INTL 20100915)
ACPI: SSDT 000000008ad75000 00032 (v01 APPLE SsdtS3 00001000 INTL 20100915)
ACPI: SSDT 000000008ad73000 015EB (v02 APPLE SsdtIGPU 00001000 INTL 20100915)
ACPI: SSDT 000000008ad72000 00F0D (v01 APPLE PcieTbt 00001000 INTL 20100915)
ACPI: SSDT 000000008ad6f000 006DB (v01 PmRef Cpu0Ist 00003000 INTL 20100915)
ACPI: SSDT 000000008ad6e000 00B3D (v01 PmRef CpuPm 00003000 INTL 20100915)
ACPI: SSDT 000000008ad6d000 00315 (v01 PmRef Cpu0Tst 00003000 INTL 20100915)
ACPI: SSDT 000000008ad6c000 0037A (v01 PmRef ApTst 00003000 INTL 20100915)
ACPI: DMAR 000000008ad6b000 000B8 (v01 APPLE IVB 00000001 AAPL 00000001)
ACPI: MCFG 000000008ad89000 0003C (v01 APPLE Apple00 00000001 Loki 0000005F)
New:
ACPI: RSDP 000000008ad8e014 00024 (v02 APPLE )
ACPI: XSDT 000000008ad8e1c0 000B4 (v01 APPLE Apple00 00000000 01000013)
ACPI: FACP 000000008ad8c000 000F4 (v04 APPLE Apple00 00000000 Loki 0000005F)
ACPI: DSDT 000000008ad82000 04708 (v01 APPLE MacBookA 00050001 INTL 20100915)
ACPI: FACS 000000008ad1c000 00040
ACPI: HPET 000000008ad8b000 00038 (v01 APPLE Apple00 00000001 Loki 0000005F)
ACPI: APIC 000000008ad8a000 000BC (v02 APPLE Apple00 00000001 Loki 0000005F)
ACPI: SBST 000000008ad88000 00030 (v01 APPLE Apple00 00000001 Loki 0000005F)
ACPI: ECDT 000000008ad87000 00053 (v01 APPLE Apple00 00000001 Loki 0000005F)
ACPI: SSDT 000000008ad7f000 001EE (v01 APPLE SataAhci 00001000 INTL 20100915)
ACPI: SSDT 000000008ad7e000 00024 (v01 APPLE SmcDppt 00001000 INTL 20100915)
ACPI: SSDT 000000008ad78000 00D74 (v01 APPLE UsbSdPpt 00001000 INTL 20100915)
ACPI: SSDT 000000008ad77000 00159 (v02 APPLE IGHda 00001000 INTL 20100915)
ACPI: SSDT 000000008ad75000 00032 (v01 APPLE SsdtS3 00001000 INTL 20100915)
ACPI: SSDT 000000008ad73000 015EB (v02 APPLE SsdtIGPU 00001000 INTL 20100915)
ACPI: SSDT 000000008ad72000 00F0D (v01 APPLE PcieTbt 00001000 INTL 20100915)
ACPI: SSDT 000000008ad6f000 00615 (v01 PmRef Cpu0Ist 00003000 INTL 20100915)
ACPI: SSDT 000000008ad6e000 00B3D (v01 PmRef CpuPm 00003000 INTL 20100915)
ACPI: SSDT 000000008ad6d000 00315 (v01 PmRef Cpu0Tst 00003000 INTL 20100915)
ACPI: SSDT 000000008ad6c000 0037A (v01 PmRef ApTst 00003000 INTL 20100915)
ACPI: DMAR 000000008ad6b000 00088 (v01 APPLE IVB 00000001 AAPL 00000001)
ACPI: MCFG 000000008ad89000 0003C (v01 APPLE Apple00 00000001 Loki 0000005F)
The first PmRef has changed in size. The rest looks pretty the same. So here
is the disassembly of this table.
/*
* Intel ACPI Component Architecture
* AML Disassembler version 20100528
*
* Disassembly of SSDT8.dat, Wed Oct 10 15:24:22 2012
*
*
* Original Table Header:
* Signature "SSDT"
* Length 0x00000615 (1557)
* Revision 0x01
* Checksum 0xC0
* OEM ID "PmRef"
* OEM Table ID "Cpu0Ist"
* OEM Revision 0x00003000 (12288)
* Compiler ID "INTL"
* Compiler Version 0x20100915 (537921813)
*/
DefinitionBlock ("SSDT8.aml", "SSDT", 1, "PmRef", "Cpu0Ist", 0x00003000)
{
External (PDC0)
External (TCNT, IntObj)
External (CPLT, IntObj)
External (\_PR_.CPU0, DeviceObj)
Scope (\_PR.CPU0)
{
Method (_PPC, 0, NotSerialized)
{
Return (CPLT)
}
Name (_PCT, Package (0x02)
{
ResourceTemplate ()
{
Register (FFixedHW,
0x10, // Bit Width
0x00, // Bit Offset
0x0000000000000199, // Address
,)
},
ResourceTemplate ()
{
Register (FFixedHW,
0x10, // Bit Width
0x00, // Bit Offset
0x0000000000000198, // Address
,)
}
})
Name (_PSS, Package (0x0E)
{
Package (0x06)
{
0x000007D1,
0x00004268,
0x0000000A,
0x0000000A,
0x00002000,
0x00002000
},
Package (0x06)
{
0x000007D0,
0x00004268,
0x0000000A,
0x0000000A,
0x00001400,
0x00001400
},
Package (0x06)
{
0x0000076C,
0x00003E5E,
0x0000000A,
0x0000000A,
0x00001300,
0x00001300
},
Package (0x06)
{
0x00000708,
0x00003A69,
0x0000000A,
0x0000000A,
0x00001200,
0x00001200
},
Package (0x06)
{
0x000006A4,
0x00003688,
0x0000000A,
0x0000000A,
0x00001100,
0x00001100
},
Package (0x06)
{
0x00000640,
0x000032BA,
0x0000000A,
0x0000000A,
0x00001000,
0x00001000
},
Package (0x06)
{
0x000005DC,
0x00002F01,
0x0000000A,
0x0000000A,
0x00000F00,
0x00000F00
},
Package (0x06)
{
0x00000578,
0x00002B5E,
0x0000000A,
0x0000000A,
0x00000E00,
0x00000E00
},
Package (0x06)
{
0x00000514,
0x000027CB,
0x0000000A,
0x0000000A,
0x00000D00,
0x00000D00
},
Package (0x06)
{
0x000004B0,
0x0000244C,
0x0000000A,
0x0000000A,
0x00000C00,
0x00000C00
},
Package (0x06)
{
0x0000044C,
0x000020E1,
0x0000000A,
0x0000000A,
0x00000B00,
0x00000B00
},
Package (0x06)
{
0x000003E8,
0x00001D88,
0x0000000A,
0x0000000A,
0x00000A00,
0x00000A00
},
Package (0x06)
{
0x00000384,
0x00001A43,
0x0000000A,
0x0000000A,
0x00000900,
0x00000900
},
Package (0x06)
{
0x00000320,
0x00001710,
0x0000000A,
0x0000000A,
0x00000800,
0x00000800
}
})
Name (APSS, Package (0x19)
{
Package (0x06)
{
0x00000C80,
0x00004268,
0x0000000A,
0x0000000A,
0x00002000,
0x00002000
},
Package (0x06)
{
0x00000C1C,
0x00004268,
0x0000000A,
0x0000000A,
0x00001F00,
0x00001F00
},
Package (0x06)
{
0x00000BB8,
0x00004268,
0x0000000A,
0x0000000A,
0x00001E00,
0x00001E00
},
Package (0x06)
{
0x00000B54,
0x00004268,
0x0000000A,
0x0000000A,
0x00001D00,
0x00001D00
},
Package (0x06)
{
0x00000AF0,
0x00004268,
0x0000000A,
0x0000000A,
0x00001C00,
0x00001C00
},
Package (0x06)
{
0x00000A8C,
0x00004268,
0x0000000A,
0x0000000A,
0x00001B00,
0x00001B00
},
Package (0x06)
{
0x00000A28,
0x00004268,
0x0000000A,
0x0000000A,
0x00001A00,
0x00001A00
},
Package (0x06)
{
0x000009C4,
0x00004268,
0x0000000A,
0x0000000A,
0x00001900,
0x00001900
},
Package (0x06)
{
0x00000960,
0x00004268,
0x0000000A,
0x0000000A,
0x00001800,
0x00001800
},
Package (0x06)
{
0x000008FC,
0x00004268,
0x0000000A,
0x0000000A,
0x00001700,
0x00001700
},
Package (0x06)
{
0x00000898,
0x00004268,
0x0000000A,
0x0000000A,
0x00001600,
0x00001600
},
Package (0x06)
{
0x00000834,
0x00004268,
0x0000000A,
0x0000000A,
0x00001500,
0x00001500
},
Package (0x06)
{
0x000007D0,
0x00004268,
0x0000000A,
0x0000000A,
0x00001400,
0x00001400
},
Package (0x06)
{
0x0000076C,
0x00003E5E,
0x0000000A,
0x0000000A,
0x00001300,
0x00001300
},
Package (0x06)
{
0x00000708,
0x00003A69,
0x0000000A,
0x0000000A,
0x00001200,
0x00001200
},
Package (0x06)
{
0x000006A4,
0x00003688,
0x0000000A,
0x0000000A,
0x00001100,
0x00001100
},
Package (0x06)
{
0x00000640,
0x000032BA,
0x0000000A,
0x0000000A,
0x00001000,
0x00001000
},
Package (0x06)
{
0x000005DC,
0x00002F01,
0x0000000A,
0x0000000A,
0x00000F00,
0x00000F00
},
Package (0x06)
{
0x00000578,
0x00002B5E,
0x0000000A,
0x0000000A,
0x00000E00,
0x00000E00
},
Package (0x06)
{
0x00000514,
0x000027CB,
0x0000000A,
0x0000000A,
0x00000D00,
0x00000D00
},
Package (0x06)
{
0x000004B0,
0x0000244C,
0x0000000A,
0x0000000A,
0x00000C00,
0x00000C00
},
Package (0x06)
{
0x0000044C,
0x000020E1,
0x0000000A,
0x0000000A,
0x00000B00,
0x00000B00
},
Package (0x06)
{
0x000003E8,
0x00001D88,
0x0000000A,
0x0000000A,
0x00000A00,
0x00000A00
},
Package (0x06)
{
0x00000384,
0x00001A43,
0x0000000A,
0x0000000A,
0x00000900,
0x00000900
},
Package (0x06)
{
0x00000320,
0x00001710,
0x0000000A,
0x0000000A,
0x00000800,
0x00000800
}
})
Name (APSN, 0x0C)
Name (APLF, 0x00)
Name (PSDF, 0x00)
Method (_PSD, 0, NotSerialized)
{
If (LNot (PSDF))
{
Store (TCNT, Index (DerefOf (Index (HPSD, 0x00)), 0x04))
Store (TCNT, Index (DerefOf (Index (SPSD, 0x00)), 0x04))
Store (Ones, PSDF)
}
If (And (PDC0, 0x0800))
{
Return (HPSD)
}
Return (SPSD)
}
Name (HPSD, Package (0x01)
{
Package (0x05)
{
0x05,
0x00,
0x00,
0xFE,
0x80
}
})
Name (SPSD, Package (0x01)
{
Package (0x05)
{
0x05,
0x00,
0x00,
0xFC,
0x80
}
})
}
}
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/