[Bugme-new] [Bug 11331] New: Fan speed setting reset after suspend to disk/ram on Thinkpad X31

bugme-daemon at bugzilla.kernel.org bugme-daemon at bugzilla.kernel.org
Thu Aug 14 06:45:44 PDT 2008


http://bugzilla.kernel.org/show_bug.cgi?id=11331

           Summary: Fan speed setting reset after suspend to disk/ram on
                    Thinkpad X31
           Product: ACPI
           Version: 2.5
     KernelVersion: 2.6.26-1
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Power-Sleep-Wake
        AssignedTo: acpi_power-sleep-wake at kernel-bugs.osdl.org
        ReportedBy: richih.mailinglist at gmail.com


Distribution: Debian unstable
Hardware Environment: Thinkpad X31
Software Environment: Debian unstable
Problem Description:
After waking the system from suspend to disk/ram, the fan speed is reset to the
default value. As I understand things, the value should be cached and re-set to
what I last set it to.

Steps to reproduce:

# echo "options thinkpad_acpi fan_control=1" >> /etc/modprobe.d/options
# shutdown -r now

# echo level 7 >! /proc/acpi/ibm/fan #fan will spin on fastest level, you will
hear this
# cat /proc/acpi/ibm/fan
status:         enabled
speed:          4107
level:          7
commands:       level <level> (<level> is 0-7, auto, disengaged, full-speed)
commands:       enable, disable
commands:       watchdog <timeout> (<timeout> is 0 (off), 1-120 (seconds))
commands:       speed <speed> (<speed> is 0-65535)
# s2ram || s2disk
press Fn-F4 or power button to wake system

# cat /proc/acpi/ibm/fan
status:         enabled
speed:          0
level:          auto
commands:       level <level> (<level> is 0-7, auto, disengaged, full-speed)
commands:       enable, disable
commands:       watchdog <timeout> (<timeout> is 0 (off), 1-120 (seconds))
commands:       speed <speed> (<speed> is 0-65535)


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