shutting down individual devices

Hi

I would like to shut down a few devices individually. The devices I try to shut down are:

The modem
The sound system

I think I can save about 2 W in this way, as lspci -vvx reports an AuxCurrent of 375 mA - I think this is at 3,3 V on my Acer TM233 laptop, so that would be about 1 W each, giving me about 30 minutes extra of battery life.

I do this by echo -n 3 >/sys/devices/pci*/*/power/state and then I verified that the state was changed to 3.

But lspci -vvx (reproduced below) says that the devices are still in D0. Is this an error? Do I need to shut down drivers before I shut down the drivers in this way, or would the kernel do that automatically for me?

kernel 2.6.7

best regards
keld

lspci -vvx:

00:00.0 Host bridge: Intel Corp. 82845G/GL [Brookdale-G] Chipset Host Bridge (rev 03)
Subsystem: Unknown device 17c0:2056
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 e0000000 (32-bit, prefetchable) [size=256M]
        Capabilities: [e4] #09 [1105]

00: 86 80 60 25 06 01 90 20 03 00 00 06 00 00 00 00 10: 08 00 00 e0 00 00 00 00 00 00 00 00 00 00 00 00 20: 00 00 00 00 00 00 00 00 00 00 00 00 c0 17 56 20 30: 00 00 00 00 e4 00 00 00 00 00 00 00 00 00 00 00

00:02.0 VGA compatible controller: Intel Corp. 82845G/GL [Brookdale-G] Chipset Integrated Graphics Device (rev 03) (prog-if 00 [VGA])
Subsystem: Unknown device 17c0:2056
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
        Interrupt: pin A routed to IRQ 10
        Region 0: Memory at d8000000 (32-bit, prefetchable) [size=128M]
        Region 1: Memory at d0000000 (32-bit, non-prefetchable)

[size=512K]
Capabilities: [d0] Power Management version 1
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
00: 86 80 62 25 07 00 90 00 03 00 00 03 00 00 00 00 10: 08 00 00 d8 00 00 00 d0 00 00 00 00 00 00 00 00 20: 00 00 00 00 00 00 00 00 00 00 00 00 c0 17 56 20 30: 00 00 00 00 d0 00 00 00 00 00 00 00 0a 01 00 00

00:1d.0 USB Controller: Intel Corp. 82801DB USB (Hub #1) (rev 02) (prog-if 00 [UHCI])
Subsystem: Unknown device 17c0:4002
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 A routed to IRQ 10
Region 4: I/O ports at 1800 [size=32]
00: 86 80 c2 24 05 00 80 02 02 00 03 0c 00 00 80 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 01 18 00 00 00 00 00 00 00 00 00 00 c0 17 02 40
30: 00 00 00 00 00 00 00 00 00 00 00 00 0a 01 00 00

00:1d.1 USB Controller: Intel Corp. 82801DB USB (Hub #2) (rev 02) (prog-if 00 [UHCI])
Subsystem: Unknown device 17c0:4002
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 11
Region 4: I/O ports at 1820 [size=32]
00: 86 80 c4 24 05 00 80 02 02 00 03 0c 00 00 00 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 21 18 00 00 00 00 00 00 00 00 00 00 c0 17 02 40
30: 00 00 00 00 00 00 00 00 00 00 00 00 0b 02 00 00

00:1d.2 USB Controller: Intel Corp. 82801DB USB (Hub #3) (rev 02) (prog-if 00 [UHCI])
Subsystem: Unknown device 17c0:4002
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 11
Region 4: I/O ports at 1840 [size=32]
00: 86 80 c7 24 05 00 80 02 02 00 03 0c 00 00 00 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 41 18 00 00 00 00 00 00 00 00 00 00 c0 17 02 40
30: 00 00 00 00 00 00 00 00 00 00 00 00 0b 03 00 00

00:1d.7 USB Controller: Intel Corp. 82801DB USB2 (rev 02) (prog-if 20 [EHCI])
Subsystem: Unknown device 17c0:1071
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 0: Memory at d0080000 (32-bit, non-prefetchable)
[size=1K]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA
PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [58] #0a [2080]
00: 86 80 cd 24 06 01 90 02 02 20 03 0c 00 00 00 00
10: 00 00 08 d0 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 c0 17 71 10
30: 00 00 00 00 50 00 00 00 00 00 00 00 0b 04 00 00

00:1e.0 PCI bridge: Intel Corp. 82801BA/CA/DB/EB PCI Bridge (rev 82) (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=02, sec-latency=32
        I/O behind bridge: 00003000-00003fff
        Memory behind bridge: d0100000-d01fffff
        BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-

00: 86 80 4e 24 07 01 80 80 82 00 04 06 00 00 01 00 10: 00 00 00 00 00 00 00 00 00 02 02 20 30 30 80 22 20: 10 d0 10 d0 f0 ff 00 00 00 00 00 00 00 00 00 00 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 04 00

00:1f.0 ISA bridge: Intel Corp. 82801DB LPC Interface Controller (rev
02)
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
00: 86 80 c0 24 0f 00 80 02 02 00 01 06 00 00 80 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00:1f.1 IDE interface: Intel Corp. 82801DB Ultra ATA Storage Controller (rev 02) (prog-if 8a [Master SecP PriP])
Subsystem: Unknown device 17c0:4002
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 A routed to IRQ 11
Region 0: I/O ports at <ignored>
Region 1: I/O ports at <ignored>
Region 2: I/O ports at <ignored>
Region 3: I/O ports at <ignored>
Region 4: I/O ports at 1860 [size=16]
Region 5: Memory at 10000000 (32-bit, non-prefetchable)
[size=1K]
00: 86 80 cb 24 07 00 80 02 02 8a 01 01 00 00 00 00
10: f1 01 00 00 f5 03 00 00 71 01 00 00 75 03 00 00
20: 61 18 00 00 00 00 00 10 00 00 00 00 c0 17 02 40
30: 00 00 00 00 00 00 00 00 00 00 00 00 ff 01 00 00

00:1f.3 SMBus: Intel Corp. 82801DB/DBM SMBus Controller (rev 02)
Subsystem: Unknown device 17c0:4002
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 10
Region 4: I/O ports at 1880 [size=32]
00: 86 80 c3 24 01 00 80 02 02 00 05 0c 00 00 00 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 81 18 00 00 00 00 00 00 00 00 00 00 c0 17 02 40
30: 00 00 00 00 00 00 00 00 00 00 00 00 0b 02 00 00

00:1f.5 Multimedia audio controller: Intel Corp. 82801DB AC'97 Audio Controller (rev 02)
Subsystem: Unknown device 17c0:2005
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 1c00 [size=256]
        Region 1: I/O ports at 18c0 [size=64]
        Region 2: Memory at d0080c00 (32-bit, non-prefetchable)
[size=512]
        Region 3: Memory at d0080800 (32-bit, non-prefetchable)

[size=256]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA
PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
00: 86 80 c5 24 07 00 90 02 02 00 01 04 00 00 00 00 10: 01 1c 00 00 c1 18 00 00 00 0c 08 d0 00 08 08 d0 20: 00 00 00 00 00 00 00 00 00 00 00 00 c0 17 05 20 30: 00 00 00 00 50 00 00 00 00 00 00 00 0b 02 00 00

00:1f.6 Modem: Intel Corp. 82801DB AC'97 Modem Controller (rev 02) (prog-if 00 [Generic])
Subsystem: Unknown device 17c0:1069
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 10
Region 0: I/O ports at 2400 [size=256]
Region 1: I/O ports at 2000 [size=128]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA
PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
00: 86 80 c6 24 01 00 90 02 02 00 03 07 00 00 00 00
10: 01 24 00 00 01 20 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 c0 17 69 10
30: 00 00 00 00 50 00 00 00 00 00 00 00 0b 02 00 00

02:05.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
Subsystem: Unknown device 17c0:1053
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: 32 (8000ns min, 16000ns max)
        Interrupt: pin A routed to IRQ 11
        Region 0: I/O ports at 3000 [size=256]
        Region 1: Memory at d0100000 (32-bit, non-prefetchable)

[size=256]
Expansion ROM at <unassigned> [disabled] [size=64K]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA
PME(D0-,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
00: ec 10 39 81 07 01 90 02 10 00 00 02 00 20 00 00 10: 01 30 00 00 00 00 10 d0 00 00 00 00 00 00 00 00 20: 00 00 00 00 00 00 00 00 00 00 00 00 c0 17 53 10 30: 00 00 00 00 50 00 00 00 00 00 00 00 0b 01 20 40

02:09.0 CardBus bridge: O2 Micro, Inc. OZ6912 Cardbus Controller
Subsystem: Unknown device 17c0:3102
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-

        Latency: 168
        Interrupt: pin A routed to IRQ 10
        Region 0: Memory at 10001000 (32-bit, non-prefetchable)
[size=4K]
        Bus: primary=02, secondary=03, subordinate=06, sec-latency=176
        Memory window 0: 10400000-107ff000 (prefetchable)
        Memory window 1: 10800000-10bff000
        I/O window 0: 00004000-000040ff
        I/O window 1: 00004400-000044ff
        BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset- 16bInt+

PostWrite+
16-bit legacy interface ports at 0001
00: 17 12 72 69 87 00 10 04 00 00 07 06 00 a8 02 00 10: 00 10 00 10 a0 00 00 02 02 03 06 b0 00 00 40 10 20: 00 f0 7f 10 00 00 80 10 00 f0 bf 10 01 40 00 00 30: fd 40 00 00 01 44 00 00 fd 44 00 00 00 01 80 05 40: c0 17 02 31 01 00 00 00 00 00 00 00 00 00 00 00 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

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I tried to shut down other devices and it worked (eth0).

So I think the reason why nothing seemed to work for me with the devices shown below, is that no actions are defined in the DSDT for these devices on the machine.

My idea is then if I can write my own DSDT for this, compile it and load it, and then hope for the hardware to work for me. Is that possible?

            Device (AC97)
            {
                Name (_ADR, 0x001F0006)
                Name (_PRW, Package (0x02)
                {
                    0x05,
                    0x03
                })
            }

            Device (AC05)
            {
                Name (_ADR, 0x00090000)
            }

Could I throw in some methods to power down the sound device, ala what is done for the USB? here is an entry for one of the USB interfaces. Or could I damage the hardware by trying out a new DSDT?

            Device (USB1)
            {
                Name (_ADR, 0x001D0000)
                OperationRegion (USBO, PCI_Config, 0xC4, 0x04)
                Field (USBO, DWordAcc, Lock, Preserve)
                {
                    RSEN,   2
                }
 
                Name (_PRW, Package (0x02)
                {
                    0x03,
                    0x00
                })
                Method (_PSW, 1, NotSerialized)
                {
                    If (Arg0)
                    {
                        Store (0x03, RSEN)
                    }
                    Else
                    {
                        Store (0x00, RSEN)
                    }
                }
 
                Method (_S3D, 0, NotSerialized)
                {
                    Return (0x02)
                }
 
                Method (_S4D, 0, NotSerialized)
                {
                    Return (0x02)
                }
            }

Best regards
keld

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