Public bug reported:
A lot of people have been reporting that the oneiric kernels have been
sucking up power (which they were, early on), but a closer look shows
that the kernel regressions are mainly all fixed - however, the brcmsmac
wireless driver appears to be a main culprit left, sucking up to ~3W of
power.
As far as I can tell, the use of the brcmsmac wireless driver co-incided
with the use of the introduction of the kernel bug that was making
battery life poor for many oneiric users, and I suspect that this is one
of the major contributors to that problem. Perhaps the brcmsmac should
be rolled back until power management is available, or a push on this
driver could possibly enable this feature. Either one would be a good
way to extend battery life for laptop users.
I am using: Ubuntu 3.0.0-12.19-generic 3.0.4 (Oneiric, with up to date
packages)
The important line from lspci is:
03:00.0 Network controller [0280]: Broadcom Corporation BCM43224 802.11a/b/g/n
[14e4:4353] (rev 01)
Subsystem: Apple Computer Inc. Device [106b:0093]
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 256 bytes
Interrupt: pin A routed to IRQ 17
Region 0: Memory at c1b00000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=2 PME-
Capabilities: [58] Vendor Specific Information: Len=78 <?>
Capabilities: [48] MSI: Enable- Count=1/1 Maskable- 64bit+
Address: 0000000000000000 Data: 0000
Capabilities: [d0] Express (v1) Endpoint, MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <4us, L1
unlimited
ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
DevCtl: Report errors: Correctable- Non-Fatal- Fatal-
Unsupported-
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 128 bytes
DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr+
TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency
L0 <4us, L1 <64us
ClockPM+ Surprise- LLActRep+ BwNot-
LnkCtl: ASPM L1 Enabled; RCB 64 bytes Disabled- Retrain-
CommClk+
ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+
DLActive+ BWMgmt- ABWMgmt-
Capabilities: [100 v1] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt-
RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt-
RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UESvrt: DLP+ SDES- TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt-
RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
CESta: RxErr+ BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
AERCap: First Error Pointer: 14, GenCap+ CGenEn- ChkCap+ ChkEn-
Capabilities: [13c v1] Virtual Channel
Caps: LPEVC=0 RefClk=100ns PATEntryBits=1
Arb: Fixed- WRR32- WRR64- WRR128-
Ctrl: ArbSelect=Fixed
Status: InProgress-
VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
Status: NegoPending- InProgress-
Capabilities: [160 v1] Device Serial Number 83-c3-dd-ff-ff-b5-10-9a
Capabilities: [16c v1] Power Budgeting <?>
Kernel driver in use: brcmsmac
Kernel modules: wl, bcma, brcmsmac
>From powertop:
The battery reports a discharge rate of 16.6 W
Summary: 0.0 wakeups/second, 0.0 GPU ops/second and 0.0 VFS ops/sec
Power est. Usage Events/s Category Description
2.61 W 100.0% Device Radio device: brcmsmac
2.35 W 60.0% Device Display backlight
759 mW 29.5 ms/s 0.0 Process /usr/sbin/macfanctld
727 mW 20.5% Device Audio codec alsa:hwC0D0:
mbp55 (Cirrus Logic)
564 mW 40.7 pkts/s Device Network interface: wlan0
(brcmsmac)
469 mW 18.3 ms/s 0.0 Process /usr/bin/knotify4
279 mW 10.9 ms/s 0.0 Process
/usr/lib/firefox-7.0.1/firefox
260 mW 10.1 ms/s 0.0 Process powertop
and, of course some output from iwconfig:
wlan0 IEEE 802.11abgn ESSID:"XXXXXXXXXX"
Mode:Managed Frequency:2.462 GHz Access Point: 00:22:B0:B2:6A:80
Bit Rate=54 Mb/s Tx-Power=19 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=47/70 Signal level=-63 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:15 Invalid misc:2221 Missed beacon:0
And finally:
"sudo iwconfig wlan0 power on" gives:
Error for wireless request "Set Power Management" (8B2C) :
SET failed on device wlan0 ; Operation not supported.
What I expected:
Ubuntu would not use a wireless driver on laptops that eats 3W of power and
can't be set to use less power.
What happened:
My batteries are being drained by a wireless card that is constantly hot (I can
feel it through the case) for which no option to enable power management exists.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
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https://bugs.launchpad.net/bugs/867869
Title:
brcmsmac wireless driver does not have power management enabled and is
eating batteries
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