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    Subjectintel hda regression: 2.6.33-rc{1,2}: hd-audio0 eats 25% CPU (according to top)
    $SUBJ

    $ git describe
    v2.6.33-rc2

    No matter if I actually play any sounds that process consumes 23-24% CPU
    Don't know if it's related to above: even if there is no any sound activity
    I can hear crackling in headphones.

    $ lspci -vvv

    00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 03)
    Subsystem: Hewlett-Packard Company Device 30c9
    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: 64 bytes
    Interrupt: pin A routed to IRQ 27
    Region 0: Memory at e0644000 (64-bit, non-prefetchable) [size=16K]
    Capabilities: [50] Power Management version 2
    Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
    Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
    Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Address: 00000000fee0300c Data: 4191
    Capabilities: [70] Express (v1) Root Complex Integrated Endpoint, MSI 00
    DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited
    ExtTag- 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 unknown, Width x0, ASPM unknown, Latency L0 <64ns, L1 <1us
    ClockPM- Surprise- LLActRep- BwNot-
    LnkCtl: ASPM Disabled; Disabled- Retrain- CommClk-
    ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
    LnkSta: Speed unknown, Width x0, TrErr- Train- SlotClk- DLActive- BWMgmt- ABWMgmt-
    Capabilities: [100] Virtual Channel <?>
    Capabilities: [130] Root Complex Link <?>
    Kernel driver in use: HDA Intel
    Kernel modules: snd-hda-intel

    $ powertop

    Cn Avg residency P-states (frequencies)
    C0 (cpu running) (25.1%) 1200 Mhz 4.7%
    C1 0.0ms ( 0.0%) 1067 Mhz 0.2%
    C2 0.3ms (74.9%) 933 Mhz 0.2%
    800 Mhz 94.9%


    Wakeups-from-idle per second : 2931.9 interval: 10.0s
    no ACPI power usage estimate available

    Top causes for wakeups:
    80.6% (6766.8) <interrupt> : HDA Intel
    10.5% (885.6) <kernel IPI> : Rescheduling interrupts
    6.4% (541.3) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
    ...

    Thanks!

    --

    Sergei[unhandled content-type:application/octet-stream]
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