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    SubjectRe: Suspend/hibernate wireless regression with 2.6.33 kernel
    On Mon, 22 Mar 2010 12:25:17 +0000
    Chris Vine <chris@cvine.freeserve.co.uk> wrote:
    > On Wed, 17 Mar 2010 01:51:13 +0000
    > Chris Vine <chris@cvine.freeserve.co.uk> wrote:
    > > Hi,
    > >
    > > I have a Lenovo S12 (Ideapad) netbook with a BCM4312 802.11b/g
    > > [14e4:4315] wireless device. Although this works using the PIO
    > > option in kernel 2.6.33/2.6.33.1 (not with DMA) using the in-kernel
    > > b43 driver, and also works with the broadcom proprietary wl driver,
    > > it breaks after a suspend or hibernate. Attempts to bring up the
    > > wlan0 interface with 'ifconfig wlan0 up' after suspension or
    > > hibernation results in the following message (although nothing is
    > > revealed by dmesg):
    > >
    > > SIOCSIFFLAGS: Unknown error 132
    > >
    > > More worryingly, when suspending or hibernating, acpi sometimes
    > > but not always appears to write to the CMOS. On two occasions I
    > > have observed that although a reboot into 2.6.33 would work (until
    > > there is another suspension or hibernation), wireless becomes
    > > permanently switched off when rebooting into 2.6.32 or earlier -
    > > when reading from the BIOS, kernel 2.6.32 and below appears to
    > > think that the radio has been disabled even though the BIOS set-up
    > > screen disagrees. When this occurs, I have to restore all defaults
    > > in the BIOS to get wireless to come on again in kernel 2.6.32 and
    > > less.
    >
    > [snip]
    >
    > This regression between 2.6.32 and 2.6.33 is still present in
    > 2.6.34-rc2, with an added twist. In 2.6.34-rc2, on resuming from
    > suspension or hibernation, my rfkill button is completely disabled -
    > that is, I cannot switch wireless on, but I also cannot switch
    > bluetooth off.

    I have found the proximate cause of this. From version 2.6.33, at boot
    time the acer-wmi module gets loaded. As this is a Lenovo netbook
    and not an Acer laptop, and probably uses a different chipset, that is
    not a good thing to do.

    If I blacklist acer-wmi, then suspension and hibernation appears to
    work normally.

    Chris




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