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    SubjectRe: Long timeout when booting >= 2.6.38
    On Wed, 4 May 2011, Christian Hoffmann wrote:

    > In fact, switching to acpi_pm doesn't seem to work:
    >
    > $ dmesg | grep clock
    >
    > [ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-2.6.39-rc5-ch-broken+
    > root=/dev/mapper/vg-root ro quiet splash vt.handoff=7 clocksource=acpi_pm
    > [ 0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-2.6.39-rc5-ch-broken+
    > root=/dev/mapper/vg-root ro quiet splash vt.handoff=7 clocksource=acpi_pm
    > [ 0.000000] hpet clockevent registered
    > [ 1.413835] Switching to clocksource hpet
    > [ 1.420762] Override clocksource acpi_pm is not HRT compatible. Cannot
    > switch while in HRT/NOHZ mode

    Huch. There is something badly wrong. Can you provide the output of

    cat /sys/devices/system/clocksource/clocksource0/available_clocksource

    please ?

    > [ 147.940143] Refined TSC clocksource calibration: 2809.409 MHz.
    > [ 147.940147] Switching to clocksource tsc

    I just looked at the two boot logs you provided. So the main
    difference is that TSC gets installed way later.

    Can you please boot the "working" kernel with clocksource=hpet on the
    commandline and verify whether the boot hang appears there as well?

    Thanks,

    tglx


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