[lkml]   [2007]   [Jun]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH] b44: power down PHY when interface down
    On Saturday 30 June 2007 13:47:35 Török Edvin wrote:
    > When the interface is down (or driver removed), the BroadCom 44xx card remains
    > powered on, and both its MAC and PHY is using up power.
    > This patch makes the driver issue a MAC_CTRL_PHY_PDOWN when the interface
    > is halted, and does a partial chip reset turns off the activity LEDs too.
    > Applies to 2.6.22-rc6, or current git head.
    > Tested on a Broadcom BCM4401-B0 card, it saves ~0.5W (measured using powertop).

    Hm, I was going to measure the real power advantage with a
    PCI-extender card. But my B44B0 card doesn't seem to work in
    that extender card. It works perfectly fine sticked directly into
    the motherboard, though, and other cards like a BCM4318 work in
    the extender, too.
    Not sure what this is.
    The extender has an application note about nonworking cards in the
    extender and a too big resistor on the board IDSEL pin being the
    cause of this.
    Maybe I can try with another machine tomorrow.

    Greetings Michael.
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2007-06-30 23:57    [W:0.019 / U:2.916 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site