Date:	Wed, 9 Dec 2015 22:26:50 +0000
From:	Peter Saunderson <peteasa@...il.com>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Guenter Roeck <linux@...ck-us.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: Re: Erratic fan speed and little control kernel 4.2

Hi Pali,

By the way I can now confirm that after several hours of use with the 
"good" kernel that the processor fan flares up.. once.. then goes back 
to normal speed.  So it is entirely possible that the kernel change that 
causes the Erratic fan behaviour has deep roots and that this commit is 
not necessarily the one that introduced the problem but more like the 
one that makes the problem very obvious!

Looking forward to working with you guys to fix this!

Peter.

On 04/12/15 16:50, Peter Saunderson wrote:
> Hi Pali,
>
> Yes I can compile the kernel, yes I can debug this if you can suggest 
> possible fixes or kprintf that you would like added to get more 
> information.
>
> Sorry I missed the dmi info...
>
> # dmidecode 2.12
> SMBIOS 2.6 present.
> 45 structures occupying 1673 bytes.
> Table at 0x000FCB40.
>
> Handle 0x0000, DMI type 0, 24 bytes
> BIOS Information
>     Vendor: Dell Inc.
>     Version: A07
>     Release Date: 11/13/2010
>     Address: 0xE0000
>     Runtime Size: 128 kB
>     ROM Size: 8192 kB
>     Characteristics:
>         PCI is supported
>         PNP is supported
>         BIOS is upgradeable
>         BIOS shadowing is allowed
>         ESCD support is available
>         Boot from CD is supported
>         Selectable boot is supported
>         BIOS ROM is socketed
>         EDD is supported
>         5.25"/1.2 MB floppy services are supported (int 13h)
>         3.5"/720 kB floppy services are supported (int 13h)
>         3.5"/2.88 MB floppy services are supported (int 13h)
>         Print screen service is supported (int 5h)
>         8042 keyboard services are supported (int 9h)
>         Serial services are supported (int 14h)
>         Printer services are supported (int 17h)
>         CGA/mono video services are supported (int 10h)
>         ACPI is supported
>         USB legacy is supported
>         LS-120 boot is supported
>         ATAPI Zip drive boot is supported
>         BIOS boot specification is supported
>         Targeted content distribution is supported
>     BIOS Revision: 8.15
>
> Handle 0x0001, DMI type 1, 27 bytes
> System Information
>     Manufacturer: Dell Inc.
>     Product Name: Inspiron 580
>     Version: Not Specified
>     Serial Number: GGBZZ4J
>     UUID: 4C4C4544-0047-4210-805A-C7C04F5A344A
>     Wake-up Type: Power Switch
>     SKU Number:
>     Family:
>
> Handle 0x0002, DMI type 2, 15 bytes
> Base Board Information
>     Manufacturer: Dell Inc.
>     Product Name: 0C2KJT
>     Version: A00
>     Serial Number: ..CN736040AD07D9.
>     Asset Tag:
>     Features:
>         Board is a hosting board
>         Board is replaceable
>     Location In Chassis:
>     Chassis Handle: 0x0003
>     Type: Motherboard
>     Contained Object Handles: 0
>
> Handle 0x0003, DMI type 3, 21 bytes
> Chassis Information
>     Manufacturer: Dell Inc.
>     Type: Desktop
>     Lock: Not Present
>     Version: Not Specified
>     Serial Number: GGBZZ4J
>     Asset Tag: Not Specified
>     Boot-up State: Safe
>     Power Supply State: Safe
>     Thermal State: Safe
>     Security Status: None
>     OEM Information: 0x00000000
>     Height: Unspecified
>     Number Of Power Cords: 1
>     Contained Elements: 0
>
> Handle 0x0004, DMI type 4, 42 bytes
> Processor Information
>     Socket Designation: CPU 1
>     Type: Central Processor
>     Family: Other
>     Manufacturer: Intel
>     ID: E5 06 01 00 FF FB EB BF
>     Version: Intel(R) Core(TM) i5 CPU         760  @ 2.80GHz
>     Voltage: Unknown
>     External Clock: 133 MHz
>     Max Speed: 2800 MHz
>     Current Speed: 2800 MHz
>     Status: Populated, Enabled
>     Upgrade: Other
>     L1 Cache Handle: 0x0005
>     L2 Cache Handle: 0x0006
>     L3 Cache Handle: 0x0007
>     Serial Number: To Be Filled By O.E.M.
>     Asset Tag: To Be Filled By O.E.M.
>     Part Number: To Be Filled By O.E.M.
>     Core Count: 4
>     Core Enabled: 4
>     Thread Count: 4
>     Characteristics:
>         64-bit capable
>
> Handle 0x0005, DMI type 7, 19 bytes
> Cache Information
>     Socket Designation: L1-Cache
>     Configuration: Enabled, Not Socketed, Level 1
>     Operational Mode: Write Through
>     Location: Internal
>     Installed Size: 256 kB
>     Maximum Size: 256 kB
>     Supported SRAM Types:
>         Other
>     Installed SRAM Type: Other
>     Speed: Unknown
>     Error Correction Type: Parity
>     System Type: Instruction
>     Associativity: 4-way Set-associative
>
> Handle 0x0006, DMI type 7, 19 bytes
> Cache Information
>     Socket Designation: L2-Cache
>     Configuration: Enabled, Not Socketed, Level 2
>     Operational Mode: Write Through
>     Location: Internal
>     Installed Size: 1024 kB
>     Maximum Size: 1024 kB
>     Supported SRAM Types:
>         Other
>     Installed SRAM Type: Other
>     Speed: Unknown
>     Error Correction Type: Single-bit ECC
>     System Type: Unified
>     Associativity: 8-way Set-associative
>
> Handle 0x0007, DMI type 7, 19 bytes
> Cache Information
>     Socket Designation: L3-Cache
>     Configuration: Enabled, Not Socketed, Level 3
>     Operational Mode: Write Back
>     Location: Internal
>     Installed Size: 8192 kB
>     Maximum Size: 8192 kB
>     Supported SRAM Types:
>         Other
>     Installed SRAM Type: Other
>     Speed: Unknown
>     Error Correction Type: Single-bit ECC
>     System Type: Unified
>     Associativity: 16-way Set-associative
>
> Handle 0x0008, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: SATA-1
>     Internal Connector Type: SAS/SATA Plug Receptacle
>     External Reference Designator: SATA-1
>     External Connector Type: SAS/SATA Plug Receptacle
>     Port Type: SATA
>
> Handle 0x0009, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: SATA-2
>     Internal Connector Type: SAS/SATA Plug Receptacle
>     External Reference Designator: SATA-2
>     External Connector Type: SAS/SATA Plug Receptacle
>     Port Type: SATA
>
> Handle 0x000A, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: SATA-3
>     Internal Connector Type: SAS/SATA Plug Receptacle
>     External Reference Designator: SATA-3
>     External Connector Type: SAS/SATA Plug Receptacle
>     Port Type: SATA
>
> Handle 0x000B, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: SATA-4
>     Internal Connector Type: SAS/SATA Plug Receptacle
>     External Reference Designator: SATA-4
>     External Connector Type: SAS/SATA Plug Receptacle
>     Port Type: SATA
>
> Handle 0x000C, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: USB0
>     External Connector Type: Other
>     Port Type: USB
>
> Handle 0x000D, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: USB1
>     External Connector Type: Other
>     Port Type: USB
>
> Handle 0x000E, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: USB2
>     External Connector Type: Other
>     Port Type: USB
>
> Handle 0x000F, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: USB3
>     External Connector Type: Other
>     Port Type: USB
>
> Handle 0x0010, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: USB4
>     External Connector Type: Other
>     Port Type: USB
>
> Handle 0x0011, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: USB5
>     External Connector Type: Other
>     Port Type: USB
>
> Handle 0x0012, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: USB6
>     External Connector Type: Other
>     Port Type: USB
>
> Handle 0x0013, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: USB7
>     External Connector Type: Other
>     Port Type: USB
>
> Handle 0x0014, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: AUDIO
>     External Connector Type: None
>     Port Type: Audio Port
>
> Handle 0x0015, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: ETHERNET
>     External Connector Type: RJ-45
>     Port Type: Network Port
>
> Handle 0x0016, DMI type 9, 17 bytes
> System Slot Information
>     Designation: PCI1
>     Type: 32-bit PCI
>     Current Usage: Available
>     Length: Short
>     ID: 1
>     Characteristics:
>         3.3 V is provided
>         Opening is shared
>         PME signal is supported
>
> Handle 0x0017, DMI type 9, 17 bytes
> System Slot Information
>     Designation: PCIE1
>     Type: x1 PCI Express
>     Current Usage: Available
>     Length: Short
>     ID: 2
>     Characteristics:
>         3.3 V is provided
>         Opening is shared
>         PME signal is supported
>
> Handle 0x0018, DMI type 9, 17 bytes
> System Slot Information
>     Designation: PCIE2
>     Type: x1 PCI Express
>     Current Usage: Available
>     Length: Short
>     ID: 3
>     Characteristics:
>         3.3 V is provided
>         Opening is shared
>         PME signal is supported
>
> Handle 0x0019, DMI type 9, 17 bytes
> System Slot Information
>     Designation: PCIE3
>     Type: x16 PCI Express
>     Current Usage: In Use
>     Length: Long
>     ID: 4
>     Characteristics:
>         3.3 V is provided
>         Opening is shared
>         PME signal is supported
>
> Handle 0x001A, DMI type 11, 5 bytes
> OEM Strings
>     String 1: www.dell.com
>
> Handle 0x001B, DMI type 13, 22 bytes
> BIOS Language Information
>     Language Description Format: Long
>     Installable Languages: 1
>         en|US|iso8859-1
>     Currently Installed Language: en|US|iso8859-1
>
> Handle 0x001C, DMI type 16, 15 bytes
> Physical Memory Array
>     Location: System Board Or Motherboard
>     Use: System Memory
>     Error Correction Type: None
>     Maximum Capacity: 16 GB
>     Error Information Handle: Not Provided
>     Number Of Devices: 4
>
> Handle 0x001D, DMI type 19, 15 bytes
> Memory Array Mapped Address
>     Starting Address: 0x00000000000
>     Ending Address: 0x001FFFFFFFF
>     Range Size: 8 GB
>     Physical Array Handle: 0x001C
>     Partition Width: 4
>
> Handle 0x001E, DMI type 17, 28 bytes
> Memory Device
>     Array Handle: 0x001C
>     Error Information Handle: Not Provided
>     Total Width: Unknown
>     Data Width: 64 bits
>     Size: 2048 MB
>     Form Factor: DIMM
>     Set: None
>     Locator: DIMM1
>     Bank Locator: Not Specified
>     Type: Other
>     Type Detail: Synchronous
>     Speed: 1333 MHz
>     Manufacturer: Samsung
>     Serial Number: 960C658C
>     Asset Tag: 000211
>     Part Number: M378B5773CH0-CH9
>     Rank: 1
>
> Handle 0x001F, DMI type 20, 19 bytes
> Memory Device Mapped Address
>     Starting Address: 0x00000000000
>     Ending Address: 0x0007FFFFFFF
>     Range Size: 2 GB
>     Physical Device Handle: 0x001E
>     Memory Array Mapped Address Handle: 0x001D
>     Partition Row Position: 1
>     Interleaved Data Depth: 1
>
> Handle 0x0020, DMI type 17, 28 bytes
> Memory Device
>     Array Handle: 0x001C
>     Error Information Handle: Not Provided
>     Total Width: Unknown
>     Data Width: 64 bits
>     Size: 2048 MB
>     Form Factor: DIMM
>     Set: None
>     Locator: DIMM2
>     Bank Locator: Not Specified
>     Type: Other
>     Type Detail: Synchronous
>     Speed: 1333 MHz
>     Manufacturer: Samsung
>     Serial Number: 960C6590
>     Asset Tag: 000211
>     Part Number: M378B5773CH0-CH9
>     Rank: 1
>
> Handle 0x0021, DMI type 20, 19 bytes
> Memory Device Mapped Address
>     Starting Address: 0x00100000000
>     Ending Address: 0x0017FFFFFFF
>     Range Size: 2 GB
>     Physical Device Handle: 0x0020
>     Memory Array Mapped Address Handle: 0x001D
>     Partition Row Position: 1
>     Interleaved Data Depth: 1
>
> Handle 0x0022, DMI type 17, 28 bytes
> Memory Device
>     Array Handle: 0x001C
>     Error Information Handle: Not Provided
>     Total Width: Unknown
>     Data Width: 64 bits
>     Size: 2048 MB
>     Form Factor: DIMM
>     Set: None
>     Locator: DIMM3
>     Bank Locator: Not Specified
>     Type: Other
>     Type Detail: Synchronous
>     Speed: 1333 MHz
>     Manufacturer: Samsung
>     Serial Number: 960C658D
>     Asset Tag: 000211
>     Part Number: M378B5773CH0-CH9
>     Rank: 1
>
> Handle 0x0023, DMI type 20, 19 bytes
> Memory Device Mapped Address
>     Starting Address: 0x00080000000
>     Ending Address: 0x000FFFFFFFF
>     Range Size: 2 GB
>     Physical Device Handle: 0x0022
>     Memory Array Mapped Address Handle: 0x001D
>     Partition Row Position: 1
>     Interleaved Data Depth: 1
>
> Handle 0x0024, DMI type 17, 28 bytes
> Memory Device
>     Array Handle: 0x001C
>     Error Information Handle: Not Provided
>     Total Width: Unknown
>     Data Width: 64 bits
>     Size: 2048 MB
>     Form Factor: DIMM
>     Set: None
>     Locator: DIMM4
>     Bank Locator: Not Specified
>     Type: Other
>     Type Detail: Synchronous
>     Speed: 1333 MHz
>     Manufacturer: Samsung
>     Serial Number: 960C6589
>     Asset Tag: 000211
>     Part Number: M378B5773CH0-CH9
>     Rank: 1
>
> Handle 0x0025, DMI type 20, 19 bytes
> Memory Device Mapped Address
>     Starting Address: 0x00180000000
>     Ending Address: 0x001FFFFFFFF
>     Range Size: 2 GB
>     Physical Device Handle: 0x0024
>     Memory Array Mapped Address Handle: 0x001D
>     Partition Row Position: 1
>     Interleaved Data Depth: 1
>
> Handle 0x0026, DMI type 32, 20 bytes
> System Boot Information
>     Status: No errors detected
>
> Handle 0x0027, DMI type 41, 11 bytes
> Onboard Device
>     Reference Designation: To Be Filled By O.E.M.
>     Type: Video
>     Status: Enabled
>     Type Instance: 0
>
> Handle 0x0028, DMI type 41, 11 bytes
> Onboard Device
>     Reference Designation: To Be Filled By O.E.M.
>     Type: SCSI Controller
>     Status: Disabled
>     Type Instance: 0
>
> Handle 0x0029, DMI type 129, 8 bytes
> OEM-specific Type
>     Header and Data:
>         81 08 29 00 01 01 02 01
>     Strings:
>         Intel_ASF
>         Intel_ASF_001
>
> Handle 0x002A, DMI type 208, 26 bytes
> OEM-specific Type
>     Header and Data:
>         D0 1A 2A 00 02 01 FE 00 38 04 00 00 00 00 00 00
>         00 00 00 00 00 00 00 00 00 00
>
> Handle 0x002B, DMI type 131, 64 bytes
> OEM-specific Type
>     Header and Data:
>         83 40 2B 00 37 00 00 00 00 00 00 00 00 00 00 00
>         F8 00 08 3B FF FF FF FF 00 00 00 00 00 00 06 00
>         B8 04 1F 00 00 00 00 00 C8 00 FF FF 00 00 00 00
>         00 00 00 00 32 00 00 00 76 50 72 6F 00 00 00 00
>
> Handle 0x002C, DMI type 127, 4 bytes
> End Of Table
>
>
>
>
> On 04/12/15 09:18, Pali Rohár wrote:
>> Hi Peter!
>>
>> On Thursday 03 December 2015 20:26:51 Peter Saunderson wrote:
>>> Erratic fan speed and little control kernel 4.2
>>>
>>> After upgrading to kernel 4.2 my CPU fan started speeding and slowing
>>> without good reason even when the PC is idle.
>>>
>>> To stop erratic fan speed - reboot sometimes works.
>>>
>>> This bug has been bisected to commit
>>> f989e55452c74b4f7b22c889b8ec9f1192aaeec4
>> There is very similar (or same) problem on desktop Dell Studio XPS 8100.
>> See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121
>>
>> In your long email is missing one important information: DMI information
>> about your machine. Can you run dmidecode and send output?
>>
>> You were able to bisect problematic commit, are you able to do some
>> additional test and debug root of this issue?
>>
>> In my opinion problem is in some SMM call, but without commenting code
>> which calling it, step by step and testing is not possible to decide...
>>
>

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