[Bugme-new] [Bug 18552] New: fans running at full-speed after resume from suspend

bugzilla-daemon at bugzilla.kernel.org bugzilla-daemon at bugzilla.kernel.org
Wed Sep 15 01:51:50 PDT 2010


           Summary: fans running at full-speed after resume from suspend
           Product: ACPI
           Version: 2.5
    Kernel Version:
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Power-Fan
        AssignedTo: acpi_power-fan at kernel-bugs.osdl.org
        ReportedBy: jon+bugzilla.kernel.org at alcopop.org
        Regression: Yes


With (at least), my CPU fan runs at full speed after resuming from
suspend and can not be convinced to climb back down.

I first noticed this occur with the Debian patched kernel 2.6.32 (debian
version -21).  The problem did not occur with 2.6.31 (debian version -2). I
then reproduced it with a pristine

My machine is a desktop PC with an Intel DG35EC motherboard, quad core 2 duo
CPU, sblive PCI sound card, ATI graphics card of some sort (quite old).

I initially reported this upstream at http://bugs.debian.org/596741

Next time I sit down to investigate this I will try bisecting between 2.6.31
and 2.6.32, but any other suggestions for diagnosis gladly welcome.

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