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Date: Thu, 16 Jul 2009 00:59:36 +0200 From: Tobias Diedrich <ranma+kernel@...edrich.de> To: Henrique de Moraes Holschuh <hmh@....eng.br>, Pavel Machek <pavel@....cz>, kernel list <linux-kernel@...r.kernel.org>, ibm-acpi@....eng.br, ibm-acpi-devel@...ts.sourceforge.net Subject: Re: 2.6.31-rc2: thinkpad boots with backlight low 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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