Re: Re: Fw: [Bugme-new] [Bug 4468] New: Upgrade to 2.6.11.6 results in no longer being able to turn the lcd backlight off.

[klug <klug@blarg.org>]

I have tried to test the patch listed below, however, my attempts to 
pass arguments to the /sys/module/backlight files hasn't been 
successful. Could anyone provide some info on the proper usage? I will 
test to see if this works in my case. Perhaps this patch in some manner 
changes things making the command that previously worked ineffective?

<adaplas@hotpop.com>
[PATCH] backlight: Add Backlight/LCD device basic support
	
From: Andrew Zabolotny
	
Here's a patch that adds basic support for controlling backlight lamps 
and lcd	panels.  The drivers can be controlled via sysfs, which makes it 
easy to use both from scripts and programs.
	
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

I am not aware of the proper way to test and see if this would allow me 
to control the backlight in this case. Perhaps this patch makes the 
command that previouly worked ineffective? I will test this if anyone 
could shed some light on how to use it.

klug wrote:
> I don't think this made it to the list. sorry if this is a repeat.
> 
> I tested 2.6.10 and had the same problem. So it seems this version is 
> where the change/problem first appeared. All the tested kernels, 
> including the working and non-working, use the same Toshiba ACPI Extras 
> version, 0.18. I only guess that the new entry (after using the command 
> that previously turned the lcd backlight off) in the non-working 
> 2.6.11->2.6.12-rc2 kernel logs (video bus notify) is something to 
> investigate. I also enabled the CONFIG_ACPI_DEBUG option and retested 
> the kernels with no luck.
> 
> klug wrote:
> 
>> I tested 2.6.12-rc2 with the same results. I get the entry "[kernel] 
>> video bus notify" in the kernel log
>> and the backlight does not turn off.
>>
>> Andrew Morton wrote:
>>
>>> Can you test 2.6.12-rc2 please?
>>>
>>>
>>> Begin forwarded message:
>>>
>>> Date: Sun, 10 Apr 2005 17:25:49 -0700
>>> From: bugme-daemon@osdl.org
>>> To: bugme-new@lists.osdl.org
>>> Subject: [Bugme-new] [Bug 4468] New: Upgrade to 2.6.11.6 results in 
>>> no longer being able to turn the lcd backlight off.
>>>
>>>
>>> http://bugme.osdl.org/show_bug.cgi?id=4468
>>>
>>>           Summary: Upgrade to 2.6.11.6 results in no longer being 
>>> able to
>>>                    turn the lcd backlight off.
>>>    Kernel Version: 2.6.11.6
>>>            Status: NEW
>>>          Severity: normal
>>>             Owner: acpi_other@kernel-bugs.osdl.org
>>>         Submitter: klug@blarg.org
>>>
>>>
>>> Distribution:
>>>
>>> Gentoo 2005.0
>>>
>>> Hardware Environment:
>>>
>>> Toshiba Satellite 5005-S507
>>>
>>> lspci -vvv
>>>
>>> 0000:00:00.0 Host bridge: Intel Corporation 82815 815 Chipset Host 
>>> Bridge and
>>> Memory Controller Hub (rev 04)
>>>     Subsystem: Toshiba America Info Systems: Unknown device 0001
>>>     Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- 
>>> ParErr- Stepping-
>>> SERR- FastB2B-
>>>     Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- 
>>> <TAbort-
>>> <MAbort+ >SERR- <PERR-
>>>     Latency: 0
>>>     Region 0: Memory at f8000000 (32-bit, prefetchable)
>>>     Capabilities: [88] #09 [e104]
>>>     Capabilities: [a0] AGP version 2.0
>>>         Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 
>>> 64bit- FW- AGP3-
>>> Rate=x1,x2,x4
>>>         Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP+ GART64- 64bit- FW- Rate=x4
>>>
>>> 0000:00:01.0 PCI bridge: Intel Corporation 82815 815 Chipset AGP 
>>> Bridge (rev 04)
>>> (prog-if 00 [Normal decode])
>>>     Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- 
>>> ParErr- Stepping-
>>> SERR- FastB2B-
>>>     Status: Cap- 66Mhz+ UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- 
>>> <TAbort-
>>> <MAbort- >SERR- <PERR-
>>>     Latency: 64
>>>     Bus: primary=00, secondary=01, subordinate=01, sec-latency=64
>>>     I/O behind bridge: 0000f000-00000fff
>>>     Memory behind bridge: fd000000-fdffffff
>>>     Prefetchable memory behind bridge: eff00000-f7ffffff
>>>     BridgeCtl: Parity- SERR- NoISA- VGA+ MAbort- >Reset- FastB2B-
>>>
>>> 0000:00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 05) 
>>> (prog-if 00
>>> [Normal decode])
>>>     Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- 
>>> ParErr- Stepping-
>>> SERR- FastB2B-
>>>     Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- 
>>> <TAbort-
>>> <MAbort- >SERR- <PERR-
>>>     Latency: 0
>>>     Bus: primary=00, secondary=02, subordinate=04, sec-latency=64
>>>     I/O behind bridge: 0000d000-0000dfff
>>>     Memory behind bridge: fce00000-fcefffff
>>>     Prefetchable memory behind bridge: fff00000-000fffff
>>>     BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
>>>
>>> 0000:00:1f.0 ISA bridge: Intel Corporation 82801BA ISA Bridge (LPC) 
>>> (rev 05)
>>>     Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- 
>>> ParErr- Stepping-
>>> SERR- FastB2B-
>>>     Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
>>> <TAbort-
>>> <MAbort- >SERR- <PERR-
>>>     Latency: 0
>>>
>>> 0000:00:1f.1 IDE interface: Intel Corporation 82801BA IDE U100 (rev 
>>> 05) (prog-if
>>> 80 [Master])
>>>     Subsystem: Toshiba America Info Systems: Unknown device 0001
>>>     Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- 
>>> ParErr- Stepping-
>>> SERR- FastB2B-
>>>     Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
>>> <TAbort-
>>> <MAbort- >SERR- <PERR-
>>>     Latency: 0
>>>     Region 4: I/O ports at cff0 [size=16]
>>>
>>> 0000:00:1f.2 USB Controller: Intel Corporation 82801BA/BAM USB (Hub 
>>> #1) (rev 05)
>>> (prog-if 00 [UHCI])
>>>     Subsystem: Toshiba America Info Systems: Unknown device 0001
>>>     Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- 
>>> ParErr- Stepping-
>>> SERR- FastB2B-
>>>     Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
>>> <TAbort-
>>> <MAbort- >SERR- <PERR-
>>>     Latency: 0
>>>     Interrupt: pin D routed to IRQ 11
>>>     Region 4: I/O ports at cf80 [size=32]
>>>
>>> 0000:00:1f.4 USB Controller: Intel Corporation 82801BA/BAM USB (Hub 
>>> #2) (rev 05)
>>> (prog-if 00 [UHCI])
>>>     Subsystem: Toshiba America Info Systems: Unknown device 0001
>>>     Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- 
>>> ParErr- Stepping-
>>> SERR- FastB2B-
>>>     Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
>>> <TAbort-
>>> <MAbort- >SERR- <PERR-
>>>     Latency: 0
>>>     Interrupt: pin C routed to IRQ 10
>>>     Region 4: I/O ports at 1000 [size=32]
>>>
>>> 0000:00:1f.5 Multimedia audio controller: Intel Corporation 
>>> 82801BA/BAM AC'97
>>> Audio (rev 05)
>>>     Subsystem: Toshiba America Info Systems: Unknown device 0002
>>>     Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- 
>>> ParErr- Stepping-
>>> SERR- FastB2B-
>>>     Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
>>> <TAbort-
>>> <MAbort- >SERR- <PERR-
>>>     Latency: 0
>>>     Interrupt: pin B routed to IRQ 10
>>>     Region 0: I/O ports at 1400
>>>     Region 1: I/O ports at 1040 [size=64]
>>>
>>> 0000:00:1f.6 Modem: Intel Corporation 82801BA/BAM AC'97 Modem (rev 
>>> 05) (prog-if
>>> 00 [Generic])
>>>     Subsystem: Toshiba America Info Systems: Unknown device 0001
>>>     Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- 
>>> ParErr- Stepping-
>>> SERR- FastB2B-
>>>     Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
>>> <TAbort-
>>> <MAbort- >SERR- <PERR-
>>>     Interrupt: pin B routed to IRQ 255
>>>     Region 0: I/O ports at 1800 [disabled]
>>>     Region 1: I/O ports at 1080 [disabled] [size=128]
>>>
>>> 0000:01:00.0 VGA compatible controller: nVidia Corporation NV17 
>>> [GeForce4 440
>>> Go] (rev a3) (prog-if 00 [VGA])
>>>     Subsystem: Toshiba America Info Systems: Unknown device 0001
>>>     Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- 
>>> ParErr- Stepping-
>>> SERR- FastB2B-
>>>     Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
>>> <TAbort-
>>> <MAbort- >SERR- <PERR-
>>>     Latency: 64 (1250ns min, 250ns max)
>>>     Interrupt: pin A routed to IRQ 5
>>>     Region 0: Memory at fd000000 (32-bit, non-prefetchable)
>>>     Region 1: Memory at f0000000 (32-bit, prefetchable) [size=128M]
>>>     Region 2: Memory at eff80000 (32-bit, prefetchable) [size=512K]
>>>     Capabilities: [60] Power Management version 2
>>>         Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA 
>>> PME(D0-,D1-,D2-,D3hot-,D3cold-)
>>>         Status: D0 PME-Enable- DSel=0 DScale=0 PME-
>>>     Capabilities: [44] AGP version 2.0
>>>         Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA- ITACoh- GART64- HTrans- 
>>> 64bit- FW+ AGP3-
>>> Rate=x1,x2,x4
>>>         Command: RQ=32 ArqSz=0 Cal=0 SBA- AGP+ GART64- 64bit- FW- 
>>> Rate=x4
>>>
>>> 0000:02:07.0 FireWire (IEEE 1394): Texas Instruments TSB43AB22/A 
>>> IEEE-1394a-2000
>>> Controller (PHY/Link) (prog-if 10 [OHCI])
>>>     Subsystem: Toshiba America Info Systems: Unknown device 0001
>>>     Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- 
>>> ParErr- Stepping-
>>> SERR- FastB2B-
>>>     Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- 
>>> <TAbort-
>>> <MAbort- >SERR- <PERR-
>>>     Interrupt: pin A routed to IRQ 255
>>>     Region 0: Memory at 20000000 (32-bit, non-prefetchable) [disabled]
>>>     Region 1: Memory at 20004000 (32-bit, non-prefetchable) 
>>> [disabled] [size=16K]
>>>     Capabilities: [44] Power Management version 2
>>>         Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=55mA 
>>> PME(D0+,D1+,D2+,D3hot+,D3cold+)
>>>         Status: D3 PME-Enable- DSel=0 DScale=0 PME-
>>>
>>> 0000:02:08.0 Ethernet controller: Intel Corporation 
>>> 82801BA/BAM/CA/CAM Ethernet
>>> Controller (rev 03)
>>>     Subsystem: Toshiba America Info Systems PRO/100 VE Network 
>>> Connection
>>>     Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- 
>>> ParErr- Stepping-
>>> SERR- FastB2B-
>>>     Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
>>> <TAbort-
>>> <MAbort- >SERR- <PERR-
>>>     Latency: 64 (2000ns min, 14000ns max), cache line size 08
>>>     Interrupt: pin A routed to IRQ 10
>>>     Region 0: Memory at fceff000 (32-bit, non-prefetchable)
>>>     Region 1: I/O ports at df40 [size=64]
>>>     Capabilities: [dc] Power Management version 2
>>>         Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA 
>>> PME(D0+,D1+,D2+,D3hot+,D3cold+)
>>>         Status: D0 PME-Enable- DSel=0 DScale=2 PME-
>>>
>>> 0000:02:0b.0 CardBus bridge: Toshiba America Info Systems ToPIC100 
>>> PCI to
>>> Cardbus Bridge with ZV Support (rev 32)
>>>     Subsystem: Toshiba America Info Systems: Unknown device 0001
>>>     Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- 
>>> ParErr- Stepping-
>>> SERR- FastB2B-
>>>     Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=slow >TAbort- 
>>> <TAbort-
>>> <MAbort- >SERR- <PERR-
>>>     Interrupt: pin A routed to IRQ 255
>>>     Region 0: Memory at 20001000 (32-bit, non-prefetchable) [disabled]
>>>     Bus: primary=02, secondary=03, subordinate=06, sec-latency=0
>>>     Memory window 0: 00000000-00000000 [disabled]
>>>     Memory window 1: 00000000-00000000 [disabled]
>>>     I/O window 0: 00000000-00000003 [disabled]
>>>     I/O window 1: 00000000-00000003 [disabled]
>>>     BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset- 16bInt- 
>>> PostWrite-
>>>     16-bit legacy interface ports at 0001
>>>
>>> 0000:02:0b.1 CardBus bridge: Toshiba America Info Systems ToPIC100 
>>> PCI to
>>> Cardbus Bridge with ZV Support (rev 32)
>>>     Subsystem: Toshiba America Info Systems: Unknown device 0001
>>>     Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- 
>>> ParErr- Stepping-
>>> SERR- FastB2B-
>>>     Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=slow >TAbort- 
>>> <TAbort-
>>> <MAbort- >SERR- <PERR-
>>>     Interrupt: pin B routed to IRQ 255
>>>     Region 0: Memory at 20002000 (32-bit, non-prefetchable) [disabled]
>>>     Bus: primary=02, secondary=07, subordinate=0a, sec-latency=0
>>>     Memory window 0: 00000000-00000000 [disabled]
>>>     Memory window 1: 00000000-00000000 [disabled]
>>>     I/O window 0: 00000000-00000003 [disabled]
>>>     I/O window 1: 00000000-00000003 [disabled]
>>>     BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset- 16bInt- 
>>> PostWrite-
>>>     16-bit legacy interface ports at 0001
>>>
>>> 0000:02:0c.0 System peripheral: Toshiba America Info Systems TC6371AF 
>>> SmartMedia
>>> Controller (rev 03)
>>>     Subsystem: Toshiba America Info Systems: Unknown device 0001
>>>     Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- 
>>> ParErr- Stepping-
>>> SERR- FastB2B-
>>>     Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=slow >TAbort- 
>>> <TAbort-
>>> <MAbort- >SERR- <PERR-
>>>     Interrupt: pin B routed to IRQ 255
>>>     Region 0: Memory at 20000800 (32-bit, non-prefetchable) [disabled]
>>>     Capabilities: [80] Power Management version 2
>>>         Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA 
>>> PME(D0+,D1+,D2+,D3hot+,D3cold+)
>>>         Status: D3 PME-Enable- DSel=0 DScale=0 PME-
>>>
>>> 0000:02:0d.0 System peripheral: Toshiba America Info Systems SD TypA 
>>> Controller
>>> (rev 03)
>>>     Subsystem: Toshiba America Info Systems: Unknown device 0001
>>>     Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- 
>>> ParErr- Stepping-
>>> SERR- FastB2B-
>>>     Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- 
>>> <TAbort-
>>> <MAbort- >SERR- <PERR-
>>>     Interrupt: pin A routed to IRQ 255
>>>     Region 0: Memory at 20000a00 (32-bit, non-prefetchable) [disabled]
>>>     Capabilities: [80] Power Management version 2
>>>         Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA 
>>> PME(D0+,D1+,D2+,D3hot+,D3cold+)
>>>         Status: D3 PME-Enable- DSel=0 DScale=0 PME-
>>>
>>> /proc/cpuinfo
>>>
>>> processor    : 0
>>> vendor_id    : GenuineIntel
>>> cpu family    : 6
>>> model        : 8
>>> model name    : Pentium III (Coppermine)
>>> stepping    : 10
>>> cpu MHz        : 1096.759
>>> cache size    : 256 KB
>>> fdiv_bug    : no
>>> hlt_bug        : no
>>> f00f_bug    : no
>>> coma_bug    : no
>>> fpu        : yes
>>> fpu_exception    : yes
>>> cpuid level    : 2
>>> wp        : yes
>>> flags        : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca 
>>> cmov pat pse36 mmx
>>> fxsr sse
>>> bogomips    : 2170.88
>>>
>>> /proc/ioports
>>>
>>> 0000-001f : dma1
>>> 0020-0021 : pic1
>>> 0040-0043 : timer0
>>> 0050-0053 : timer1
>>> 0060-006f : keyboard
>>> 0080-008f : dma page reg
>>> 00a0-00a1 : pic2
>>> 00c0-00df : dma2
>>> 00f0-00ff : fpu
>>> 0170-0177 : ide1
>>> 01f0-01f7 : ide0
>>> 0376-0376 : ide1
>>> 03c0-03df : vesafb
>>> 03f6-03f6 : ide0
>>> 0cf8-0cff : PCI conf1
>>> 1000-101f : 0000:00:1f.4
>>>  1000-101f : uhci_hcd
>>> 1040-107f : 0000:00:1f.5
>>>  1040-107f : Intel 82801BA-ICH2
>>> 1080-10ff : 0000:00:1f.6
>>> 1400-14ff : 0000:00:1f.5
>>>  1400-14ff : Intel 82801BA-ICH2
>>> 1800-18ff : 0000:00:1f.6
>>> cf80-cf9f : 0000:00:1f.2
>>>  cf80-cf9f : uhci_hcd
>>> cff0-cfff : 0000:00:1f.1
>>>  cff0-cff7 : ide0
>>>  cff8-cfff : ide1
>>> df40-df7f : 0000:02:08.0
>>>  df40-df7f : eepro100
>>> e000-e07f : motherboard
>>> e080-e0ff : motherboard
>>> e400-e47f : motherboard
>>> e480-e4ff : motherboard
>>> e800-e87f : motherboard
>>> e880-e8ff : motherboard
>>> ec00-ec7f : motherboard
>>> ec80-ecff : motherboard
>>> ee00-ee7f : 0000:00:1f.0
>>>  ee00-ee7f : motherboard
>>>    ee00-ee03 : PM1a_EVT_BLK
>>>    ee04-ee05 : PM1a_CNT_BLK
>>>    ee08-ee0b : PM_TMR
>>>    ee10-ee15 : ACPI CPU throttle
>>>    ee20-ee20 : PM2_CNT_BLK
>>>    ee28-ee2b : GPE0_BLK
>>> ee80-ee8f : motherboard
>>> ee90-ee9f : motherboard
>>> eeac-eeac : motherboard
>>> eec0-eeff : 0000:00:1f.0
>>>  eec0-eeff : motherboard
>>>
>>> /proc/iomem
>>>
>>> 00000000-0009fbff : System RAM
>>> 0009fc00-0009ffff : reserved
>>> 000a0000-000bffff : Video RAM area
>>> 000c0000-000cffff : Video ROM
>>> 000e0000-000eedff : reserved
>>> 000eee00-000eefff : ACPI Non-volatile Storage
>>> 000f0000-000fffff : System ROM
>>> 00100000-1ffeffff : System RAM
>>>  00100000-0033ac75 : Kernel code
>>>  0033ac76-00411d5f : Kernel data
>>> 1fff0000-1fffffff : ACPI Tables
>>> 20000000-200007ff : 0000:02:07.0
>>> 20000800-2000081f : 0000:02:0c.0
>>> 20000a00-20000bff : 0000:02:0d.0
>>> 20001000-20001fff : 0000:02:0b.0
>>> 20002000-20002fff : 0000:02:0b.1
>>> 20004000-20007fff : 0000:02:07.0
>>> eff00000-f7ffffff : PCI Bus #01
>>>  eff80000-efffffff : 0000:01:00.0
>>>  f0000000-f7ffffff : 0000:01:00.0
>>>    f0000000-f1ffffff : vesafb
>>> f8000000-fbffffff : 0000:00:00.0
>>> fceff000-fcefffff : 0000:02:08.0
>>>  fceff000-fcefffff : eepro100
>>> fd000000-fdffffff : PCI Bus #01
>>>  fd000000-fdffffff : 0000:01:00.0
>>> feea0000-feebffff : reserved
>>> ffb80000-ffbfffff : reserved
>>> fff80000-ffffffff : reserved
>>>
>>> no modules, and no scsi
>>>
>>> Software Environment:
>>>
>>> note: I am using UNPATCHED kernel sources directly from kernel.org, 
>>> not patched
>>> sources from gentoo's portage tree.
>>> gcc version 3.3.5 (Gentoo Linux 3.3.5-r1, ssp-3.3.2-3, pie-8.7.7.1)
>>>
>>> Problem Description:
>>>
>>> Previous to my 2.6.11.6 upgrade I was running 2.6.9. With all 
>>> unpatched 2.6
>>> kernel versions up to and including 2.6.9, I could turn the lcd 
>>> backlight off by
>>> running "echo lcd_out:0 > /proc/acpi/toshiba/video" as root. I 
>>> upgraded directly
>>> from 2.6.9 to 2.6.11.6. With the upgrade I am no longer able to turn 
>>> the lcd
>>> backlight off. There is no effect after running "echo lcd_out:0 >
>>> /proc/acpi/toshiba/video" and the /proc/acpi/toshiba/video lcd_out 
>>> option
>>> remains unchanged as 1. I recompiled the 2.6.11.6 kernel with the new 
>>> option
>>> CONFIG_BACKLIGHT_LCD_SUPPORT=y. Enabling this option did not allow 
>>> the command
>>> (echo lcd_out:0 > /proc/acpi/toshiba/video) to turn the lcd backlight 
>>> off, or
>>> change the lcd_out option to 0. However, I do get the following entry 
>>> in my
>>> kernel logs after running the command while running 2.6.11.6, 
>>> "[kernel] video
>>> bus notify". Previous to the upgrade, there was no entry in my kernel 
>>> logs after
>>> running the command.
>>> Steps to reproduce:
>>>
>>> build 2.6.11.6 with
>>>
>>> CONFIG_TOSHIBA=y
>>>
>>> CONFIG_ACPI=y
>>> CONFIG_ACPI_BOOT=y
>>> CONFIG_ACPI_INTERPRETER=y
>>> # CONFIG_ACPI_SLEEP is not set
>>> CONFIG_ACPI_AC=y
>>> CONFIG_ACPI_BATTERY=y
>>> CONFIG_ACPI_BUTTON=y
>>> CONFIG_ACPI_VIDEO=y
>>> CONFIG_ACPI_FAN=y
>>> CONFIG_ACPI_PROCESSOR=y
>>> CONFIG_ACPI_THERMAL=y
>>> # CONFIG_ACPI_ASUS is not set
>>> # CONFIG_ACPI_IBM is not set
>>> CONFIG_ACPI_TOSHIBA=y
>>> CONFIG_ACPI_BLACKLIST_YEAR=0
>>> # CONFIG_ACPI_DEBUG is not set
>>> CONFIG_ACPI_BUS=y
>>> CONFIG_ACPI_EC=y
>>> CONFIG_ACPI_POWER=y
>>> CONFIG_ACPI_PCI=y
>>> CONFIG_ACPI_SYSTEM=y
>>> # CONFIG_X86_PM_TIMER is not set
>>> # CONFIG_ACPI_CONTAINER is not set
>>>
>>> note: enabling the CONFIG_BACKLIGHT_LCD_SUPPORT option does not 
>>> change anything.
>>>
>>> and run, echo lcd_out:0 > /proc/acpi/toshiba/video
>>>
>>> ------- You are receiving this mail because: -------
>>> You are on the CC list for the bug, or are watching someone who is.
>>>
>>>  
>>>
>>
>>
> 


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