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    SubjectRe: 2.6.23-rc1 regression: hwmon/w83627ehf: wrong fan speed
    Jean Delvare wrote:
    > I just tried 2.6.23-rc2 on a system where I use the w83627ehf hardware
    > monitoring driver, and was not able to reproduce the problem you
    > described. Fan speeds are reported properly for me. Which I kind of
    > expected, as I tested all my w83627ehf patches on this system before
    > submitting them.

    Thanks that you are still after it. I was busy with other stuff the
    whole week, hence no git bisect result from me yet.

    > Please try using sensors instead of ksensors, and confirm that the
    > behavior is the same. I'd like to rule out a problem in ksensors
    > itself. sensors will also report the fan divs, this is a useful
    > information given the problem you have.

    # sensors
    w83627ehf-isa-0290
    Adapter: ISA adapter
    VCore: +0.95 V (min = +0.00 V, max = +1.74 V)
    in1: +12.30 V (min = +1.64 V, max = +3.22 V) ALARM
    AVCC: +3.28 V (min = +1.89 V, max = +1.94 V) ALARM
    3VCC: +3.26 V (min = +0.18 V, max = +0.72 V) ALARM
    in4: +1.58 V (min = +0.57 V, max = +0.90 V) ALARM
    in5: +1.70 V (min = +0.41 V, max = +1.19 V) ALARM
    in6: +3.43 V (min = +0.31 V, max = +3.05 V) ALARM
    VSB: +3.25 V (min = +0.37 V, max = +3.01 V) ALARM
    VBAT: +3.18 V (min = +3.94 V, max = +0.74 V) ALARM
    in9: +1.88 V (min = +0.79 V, max = +1.40 V) ALARM
    Case Fan: 0 RPM (min = 753 RPM, div = 128) ALARM
    CPU Fan: 88 RPM (min = 659 RPM, div = 64) ALARM
    Aux Fan: 0 RPM (min = 10546 RPM, div = 128) ALARM
    fan5: 0 RPM (min = 753 RPM, div = 128) ALARM
    Sys Temp: +44 C (high = -5 C, hyst = -34 C) ALARM
    CPU Temp: +38.0 C (high = +80.0 C, hyst = +75.0 C)
    AUX Temp: +43.5 C (high = +80.0 C, hyst = +75.0 C)

    coretemp-isa-0000
    Adapter: ISA adapter

    coretemp-isa-0001
    Adapter: ISA adapter

    (The aux fan and fan5 are not connected.)

    > Your original post suggests that the fan speed is supposed to change
    > depending on the system load? Or temperature? Please describe the
    > mechanism used to achieve this. Could it be that this mechanism isn't
    > working properly, and the reported (low) speeds are actually true?

    The motherboard controls the CPU fan and I believe also the case fan,
    probably based on temperatures. (The manual is buried somewhere and
    MSI's download site is down right in this moment.)

    The low speeds or the dividers incorrect. I'll reboot in a minute into
    2.6.22(-rc5) and post the "sensors" output.

    > What fan inputs are used by your CPU and system fans? "sensors
    > -c /dev/null" will tell.

    ...
    fan1: 484 RPM (min = 12053 RPM, div = 16) ALARM
    fan2: 89 RPM (min = 659 RPM, div = 64) ALARM
    fan3: 0 RPM (min = 10546 RPM, div = 128) ALARM
    fan5: 0 RPM (min = 1506 RPM, div = 128) ALARM
    ...

    Hmm, interesting. When I now re-run sensors I get
    ...
    Case Fan: 484 RPM (min = 12053 RPM, div = 16) ALARM
    CPU Fan: 89 RPM (min = 659 RPM, div = 64) ALARM
    Aux Fan: 0 RPM (min = 10546 RPM, div = 128) ALARM
    fan5: 0 RPM (min = 1506 RPM, div = 128) ALARM
    ...

    (I'm still in 2.6.23-rc2. Ksensors picked the 484 RPM of the case fan
    up too, and that's most certainly the correct speed. Just the CPU fan's
    speed is still wrong; or rather its divider should be 16 rather than 64.)

    > Other than that, I can only ask for the same things Mark already
    > suggested: compile with HWMON debugging and provide the logs (this will
    > show what fan div the driver is trying to select), and try bisecting
    > using git to find out which patch exactly caused the problem.

    How comes the divider of one of the fans changed from one minute to the
    other?

    FWIW, the ``chip "w83627ehf-*"´´ section in Gentoo's /etc/sensors.conf
    provides only labels for fan{1,2,3}. It is titled
    # Winbond W83627EHF configuration originally contributed by Leon Moonen
    # This is for an Asus P5P800, voltages for A8V-E SE.

    Should I hardwire correct dividers or pulse per rev in sensors.conf or
    is the driver supposed to work the correct dividers out --- like it did
    before 2.6.23-rc?
    --
    Stefan Richter
    -=====-=-=== =--- -=-==
    http://arcgraph.de/sr/
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