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    SubjectRe: Linux 2.6.33.8
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    On Thu, 2011-03-31 at 20:22 +0200, Carsten Emde wrote:
    > Greg,
    >
    > > I'm announcing the release of the 2.6.33.8 kernel.
    > >
    > > This is primarily for the use of those people who are stuck using the
    > > .33-rt kernel. Anyone else who really wants to use the .33 kernel tree
    > > is welcome to use this one as well.
    > Thanks a lot for your work. It's highly appreciated.
    >
    > While preparing 2.6.33.8/9 plus PREEMPT_RT patches for quality
    > assurance in our farm, I found that the "halt" command no longer
    > powers down the pretest machine (i7/Gulftown); this misbehavior occurs
    > with and without the PREEMPT_RT patches.
    >
    > 2.6.33.7:
    > # halt
    > sd 0:0:0:0: [sda] Synchronizing SCSI cache
    > sd 0:0:0:0: [sda] Stopping disk
    > sd 2:0:0:0: [sdb] Synchronizing SCSI cache
    > sd 2:0:0:0: [sdb] Stopping disk
    > The machine is powered down.
    >
    > 2.6.33.8:
    > sd 0:0:0:0: [sda] Synchronizing SCSI cache
    > sd 0:0:0:0: [sda] Stopping disk
    > sd 2:0:0:0: [sdb] Synchronizing SCSI cache
    > sd 2:0:0:0: [sdb] Stopping disk
    > ACPI: Preparing to enter system sleep state S5
    > Disabling non-boot CPUs ...
    > The machine is NOT powered down. Can be powered down only by pulling
    > the power plug or holding the on/off button for 5 seconds.

    (FWIW, my x3550 M3 (E5620) and Q6600 power down fine with 2.6.33.9-rt30)

    > Bisecting from 2.6.33.7 to 2.6.33.8 revealed:
    > 74a6e0fd8fc216cfa5edcde4bd356a8972cbc74c is the first bad commit
    > commit 74a6e0fd8fc216cfa5edcde4bd356a8972cbc74c
    > Author: H. Peter Anvin <hpa@linux.intel.com>
    > Date: Fri Dec 10 23:57:04 2010 -0500
    >
    > x86, hotplug: Use mwait to offline a processor, fix the legacy case
    >
    > upstream ea53069231f9317062910d6e772cca4ce93de8c8
    > x86, hotplug: Use mwait to offline a processor, fix the legacy case

    The question would appear to be does mainline beyond this point exhibit
    the same symptom?

    -Mike




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