Re: 2.6.31-rc2: thinkpad boots with backlight low

From: Tobias Diedrich
Date: Wed Jul 15 2009 - 18:59:46 EST

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Tobias Diedrich wrote:
> Henrique de Moraes Holschuh wrote:
> > There is one thing that comes to mind: display power management.
> >
> > Is anything, by chance, setting the backlight devices to low power mode
> > on machine restart? The backlight drivers would try to set brightness
> > to 0 when it cannot turn the display off for real...
>
> Whatever registers /sys/class/backlight/thinkpad_screen/ seems to be
> responsible.
> After boot this has 0 for brightness and actual_brightness, 7 for
> max_brightness.
> Adjusting the backlight brightness with thinkpad keys does not
> affect this at all, it always stays at 0.
> If I manually change it to 7 and reboot (or poweroff, for
> that matter), then backlight brightness is apparently changed to
> that value (instead of minimum).
>
> grepping shows it's actually thinkpad_acpi registering
> thinkpad_screen. (Well, that was kind of to be expected)
> And /proc/acpi/ibm/brightness also doesn't seem to reflect the real
> current value...
>
> What irritates me is that a compiled in thinkpad_acpi does not show
> up as a module in /sys/modules and so I can't look at the
> module parameters. (brightness_mode looks interesting)

Ok, after compiling it as a module and trying a few variations, it
seems that on my X41 Tablet only brightness_mode=2 works, that is
TPACPI_BRGHT_MODE_UCMS_STEP.

This is contrasted by thinkpad_acpi.c which states:
|if (acpi_evalf(ec_handle, NULL, "HBRV", "qd"))
| /* T40-T43, R50-R52, R50e, R51e, X31-X41 */
| brightness_mode = TPACPI_BRGHT_MODE_ECNVRAM;
|else
| /* all other IBM ThinkPads */
| brightness_mode = TPACPI_BRGHT_MODE_UCMS_STEP;

So TPACPI_BRGHT_MODE_ECNVRAM looks broken somehow?
I assume that the autodetection finds the HBRV acpi function and
selects the former, resulting in a not working backlight control.

FWIW here is the dmi info on my model:

# dmidecode 2.9
SMBIOS 2.33 present.
59 structures occupying 1911 bytes.
Table at 0x000E0010.

Handle 0x0000, DMI type 0, 20 bytes
BIOS Information
Vendor: IBM
Version: 75ET60WW (2.06 )
Release Date: 12/19/2006
Address: 0xDC000
Runtime Size: 144 kB
ROM Size: 1024 kB
Characteristics:
PCI is supported
PC Card (PCMCIA) is supported
PNP is supported
APM is supported
BIOS is upgradeable
BIOS shadowing is allowed
ESCD support is available
Boot from CD is supported
Selectable boot is supported
EDD is supported
3.5"/720 KB 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
BIOS boot specification is supported

Handle 0x0001, DMI type 1, 25 bytes
System Information
Manufacturer: IBM
Product Name: 1866CTO
Version: ThinkPad X41 Tablet
Serial Number: LVH5852
UUID: AEDCB235-6567-8ADE-CC6E-DAC3BC6EDAC2
Wake-up Type: Power Switch

Handle 0x0002, DMI type 2, 8 bytes
Base Board Information
Manufacturer: IBM
Product Name: 1866CTO
Version: Not Available
Serial Number: 3425458GFA4

Handle 0x0003, DMI type 3, 17 bytes
Chassis Information
Manufacturer: IBM
Type: Notebook
Lock: Not Present
Version: Not Available
Serial Number: Not Available
Asset Tag: No Asset Information
Boot-up State: Unknown
Power Supply State: Unknown
Thermal State: Unknown
Security Status: Unknown
OEM Information: 0x00000000

Handle 0x0004, DMI type 126, 17 bytes
Inactive

Handle 0x0005, DMI type 126, 17 bytes
Inactive

Handle 0x0006, DMI type 4, 35 bytes
Processor Information
Socket Designation: None
Type: Central Processor
Family: Pentium M
Manufacturer: GenuineIntel
ID: D8 06 00 00 FF FB E9 AF
Signature: Type 0, Family 6, Model 13, Stepping 8
Flags:
FPU (Floating-point unit on-chip)
VME (Virtual mode extension)
DE (Debugging extension)
PSE (Page size extension)
TSC (Time stamp counter)
MSR (Model specific registers)
PAE (Physical address extension)
MCE (Machine check exception)
CX8 (CMPXCHG8 instruction supported)
APIC (On-chip APIC hardware supported)
SEP (Fast system call)
MTRR (Memory type range registers)
PGE (Page global enable)
MCA (Machine check architecture)
CMOV (Conditional move instruction supported)
PAT (Page attribute table)
CLFSH (CLFLUSH instruction supported)
DS (Debug store)
ACPI (ACPI supported)
MMX (MMX technology supported)
FXSR (Fast floating-point save and restore)
SSE (Streaming SIMD extensions)
SSE2 (Streaming SIMD extensions 2)
SS (Self-snoop)
TM (Thermal monitor supported)
PBE (Pending break enabled)
Version: Intel(R) Pentium(R) M processor
Voltage: 1.1 V
External Clock: 400 MHz
Max Speed: 1500 MHz
Current Speed: 1500 MHz
Status: Populated, Enabled
Upgrade: None
L1 Cache Handle: 0x000A
L2 Cache Handle: 0x000B
L3 Cache Handle: Not Provided
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified

Handle 0x0007, DMI type 5, 20 bytes
Memory Controller Information
Error Detecting Method: None
Error Correcting Capabilities:
None
Supported Interleave: One-way Interleave
Current Interleave: One-way Interleave
Maximum Memory Module Size: 1024 MB
Maximum Total Memory Size: 2048 MB
Supported Speeds:
Other
Supported Memory Types:
DIMM
SDRAM
Memory Module Voltage: 2.9 V
Associated Memory Slots: 2
0x0008
0x0009
Enabled Error Correcting Capabilities:
Unknown

Handle 0x0008, DMI type 6, 12 bytes
Memory Module Information
Socket Designation: DIMM Slot 1
Bank Connections: 0 3
Current Speed: Unknown
Type: DIMM SDRAM
Installed Size: 512 MB (Double-bank Connection)
Enabled Size: 512 MB (Double-bank Connection)
Error Status: OK

Handle 0x0009, DMI type 6, 12 bytes
Memory Module Information
Socket Designation: DIMM Slot 2
Bank Connections: 4 7
Current Speed: Unknown
Type: DIMM SDRAM
Installed Size: 1024 MB (Double-bank Connection)
Enabled Size: 1024 MB (Double-bank Connection)
Error Status: OK

Handle 0x000A, DMI type 7, 19 bytes
Cache Information
Socket Designation: Internal L1 Cache
Configuration: Enabled, Socketed, Level 1
Operational Mode: Write Back
Location: Internal
Installed Size: 32 KB
Maximum Size: 32 KB
Supported SRAM Types:
Synchronous
Installed SRAM Type: Synchronous
Speed: Unknown
Error Correction Type: Single-bit ECC
System Type: Data
Associativity: 8-way Set-associative

Handle 0x000B, DMI type 7, 19 bytes
Cache Information
Socket Designation: Internal L2 Cache
Configuration: Enabled, Socketed, Level 2
Operational Mode: Write Back
Location: Internal
Installed Size: 2048 KB
Maximum Size: 2048 KB
Supported SRAM Types:
Burst
Installed SRAM Type: Burst
Speed: Unknown
Error Correction Type: Multi-bit ECC
System Type: Unified
Associativity: 8-way Set-associative

Handle 0x000C, DMI type 126, 9 bytes
Inactive

Handle 0x000D, DMI type 8, 9 bytes
Port Connector Information
Internal Reference Designator: Not Available
Internal Connector Type: None
External Reference Designator: Infrared
External Connector Type: Infrared
Port Type: Other

Handle 0x000E, DMI type 8, 9 bytes
Port Connector Information
Internal Reference Designator: Not Available
Internal Connector Type: None
External Reference Designator: Parallel
External Connector Type: DB-25 female
Port Type: Parallel Port ECP/EPP

Handle 0x000F, DMI type 8, 9 bytes
Port Connector Information
Internal Reference Designator: Not Available
Internal Connector Type: None
External Reference Designator: External Monitor
External Connector Type: DB-15 female
Port Type: Video Port

Handle 0x0010, DMI type 126, 9 bytes
Inactive

Handle 0x0011, DMI type 126, 9 bytes
Inactive

Handle 0x0012, DMI type 126, 9 bytes
Inactive

Handle 0x0013, DMI type 126, 9 bytes
Inactive

Handle 0x0014, DMI type 8, 9 bytes
Port Connector Information
Internal Reference Designator: Not Available
Internal Connector Type: None
External Reference Designator: Microphone Jack
External Connector Type: Mini Jack (headphones)
Port Type: Audio Port

Handle 0x0015, DMI type 8, 9 bytes
Port Connector Information
Internal Reference Designator: Not Available
Internal Connector Type: None
External Reference Designator: Headphone Jack
External Connector Type: Mini Jack (headphones)
Port Type: Audio Port

Handle 0x0016, DMI type 8, 9 bytes
Port Connector Information
Internal Reference Designator: Not Available
Internal Connector Type: None
External Reference Designator: Modem
External Connector Type: RJ-11
Port Type: Modem Port

Handle 0x0017, DMI type 8, 9 bytes
Port Connector Information
Internal Reference Designator: Not Available
Internal Connector Type: None
External Reference Designator: Ethernet
External Connector Type: RJ-45
Port Type: Network Port

Handle 0x0018, DMI type 8, 9 bytes
Port Connector Information
Internal Reference Designator: Not Available
Internal Connector Type: None
External Reference Designator: USB 1
External Connector Type: Access Bus (USB)
Port Type: USB

Handle 0x0019, DMI type 8, 9 bytes
Port Connector Information
Internal Reference Designator: Not Available
Internal Connector Type: None
External Reference Designator: USB 2
External Connector Type: Access Bus (USB)
Port Type: USB

Handle 0x001A, DMI type 126, 9 bytes
Inactive

Handle 0x001B, DMI type 126, 9 bytes
Inactive

Handle 0x001C, DMI type 126, 9 bytes
Inactive

Handle 0x001D, DMI type 126, 9 bytes
Inactive

Handle 0x001E, DMI type 9, 13 bytes
System Slot Information
Designation: CardBus Slot 1
Type: 32-bit PC Card (PCMCIA)
Current Usage: Available
Length: Other
ID: Adapter 0, Socket 0
Characteristics:
5.0 V is provided
3.3 V is provided
PC Card-16 is supported
Cardbus is supported
Zoom Video is supported
Modem ring resume is supported
PME signal is supported
Hot-plug devices are supported

Handle 0x001F, DMI type 126, 13 bytes
Inactive

Handle 0x0020, DMI type 126, 13 bytes
Inactive

Handle 0x0021, DMI type 9, 13 bytes
System Slot Information
Designation: SD Slot
Type: 32-bit Other
Current Usage: Available
Length: Other
Characteristics:
5.0 V is provided
3.3 V is provided
PME signal is supported
Hot-plug devices are supported

Handle 0x0022, DMI type 9, 13 bytes
System Slot Information
Designation: Mini-PCI Slot 1
Type: 32-bit PCI
Current Usage: Available
Length: Other
ID: 1
Characteristics:
5.0 V is provided
3.3 V is provided
PME signal is supported
SMBus signal is supported

Handle 0x0023, DMI type 126, 13 bytes
Inactive

Handle 0x0024, DMI type 10, 6 bytes
On Board Device Information
Type: Other
Status: Enabled
Description: IBM Embedded Security hardware

Handle 0x0025, DMI type 11, 5 bytes
OEM Strings
String 1: IBM ThinkPad Embedded Controller -[75HT20WW-1.02 ]-

Handle 0x0026, DMI type 13, 22 bytes
BIOS Language Information
Installable Languages: 1
enUS
Currently Installed Language: enUS

Handle 0x0027, DMI type 15, 25 bytes
System Event Log
Area Length: 0 bytes
Header Start Offset: 0x0000
Header Length: 16 bytes
Data Start Offset: 0x0010
Access Method: General-purpose non-volatile data functions
Access Address: 0x0000
Status: Invalid, Full
Change Token: 0x00000059
Header Format: Type 1
Supported Log Type Descriptors: 1
Descriptor 1: POST error
Data Format 1: POST results bitmap

Handle 0x0028, DMI type 16, 15 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: None
Maximum Capacity: 1 GB
Error Information Handle: Not Provided
Number Of Devices: 2

Handle 0x0029, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0028
Error Information Handle: No Error
Total Width: 64 bits
Data Width: 64 bits
Size: 512 MB
Form Factor: SODIMM
Set: None
Locator: DIMM 1
Bank Locator: Bank 0/1
Type: DDR
Type Detail: Synchronous
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified

Handle 0x002A, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0028
Error Information Handle: No Error
Total Width: 64 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: SODIMM
Set: None
Locator: DIMM 2
Bank Locator: Bank 2/3
Type: DDR
Type Detail: Synchronous
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified

Handle 0x002B, DMI type 18, 23 bytes
32-bit Memory Error Information
Type: OK
Granularity: Unknown
Operation: Unknown
Vendor Syndrome: Unknown
Memory Array Address: Unknown
Device Address: Unknown
Resolution: Unknown

Handle 0x002C, DMI type 19, 15 bytes
Memory Array Mapped Address
Starting Address: 0x00000000000
Ending Address: 0x0005FFFFFFF
Range Size: 1536 MB
Physical Array Handle: 0x0028
Partition Width: 0

Handle 0x002D, DMI type 20, 19 bytes
Memory Device Mapped Address
Starting Address: 0x00000000000
Ending Address: 0x0001FFFFFFF
Range Size: 512 MB
Physical Device Handle: 0x0029
Memory Array Mapped Address Handle: 0x002C
Partition Row Position: 1

Handle 0x002E, DMI type 20, 19 bytes
Memory Device Mapped Address
Starting Address: 0x00020000000
Ending Address: 0x0005FFFFFFF
Range Size: 1 GB
Physical Device Handle: 0x002A
Memory Array Mapped Address Handle: 0x002C
Partition Row Position: 1

Handle 0x002F, DMI type 21, 7 bytes
Built-in Pointing Device
Type: Track Point
Interface: PS/2
Buttons: 3

Handle 0x0030, DMI type 126, 7 bytes
Inactive

Handle 0x0031, DMI type 24, 5 bytes
Hardware Security
Power-On Password Status: Disabled
Keyboard Password Status: Disabled
Administrator Password Status: Disabled
Front Panel Reset Status: Unknown

Handle 0x0032, DMI type 32, 11 bytes
System Boot Information
Status: No errors detected

Handle 0x0033, DMI type 131, 17 bytes
OEM-specific Type
Header and Data:
83 11 33 00 01 02 03 FF FF 1F 00 00 00 00 00 02
00
Strings:
BOOTINF 20h
BOOTDEV 21h
KEYPTRS 23h

Handle 0x0034, DMI type 132, 7 bytes
OEM-specific Type
Header and Data:
84 07 34 00 01 D8 36

Handle 0x0035, DMI type 133, 5 bytes
OEM-specific Type
Header and Data:
85 05 35 00 01
Strings:
KHOIHGIUCCHHII

Handle 0x0036, DMI type 126, 13 bytes
Inactive

Handle 0x0037, DMI type 135, 13 bytes
OEM-specific Type
Header and Data:
87 0D 37 00 54 50 07 00 01 01 00 00 00

Handle 0x0038, DMI type 135, 18 bytes
OEM-specific Type
Header and Data:
87 12 38 00 54 50 07 01 01 9E 00 00 00 00 00 00
00 00

Handle 0x0039, DMI type 136, 6 bytes
OEM-specific Type
Header and Data:
88 06 39 00 5A 5A

Handle 0x003A, DMI type 127, 4 bytes
End Of Table

--
Tobias PGP: http://9ac7e0bc.uguu.de
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Next message: Dan Williams: "Why do we probe option roms at 2K boundaries?"
Previous message: john stultz: "Re: Clock incorrect on 2.6.31-rc2"
In reply to: Tobias Diedrich: "Re: 2.6.31-rc2: thinkpad boots with backlight low"
Next in thread: Henrique de Moraes Holschuh: "Re: 2.6.31-rc2: thinkpad boots with backlight low"
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