This problem disappeared for me sometime while I was running Intrepid. Now that I've done the upgrade to jaunty, it's back.
I upgraded via the "do-release-upgrade" method. The precise message is: Apr 26 10:34:46 arwen kernel: [54142.600473] ACPI: Unable to turn cooling device [ffff88022f81abc0] 'on' It occurs every 6 seconds, just like everyone else is seeing. In my boot messages, I see: Apr 25 19:32:41 arwen kernel: [ 1.615740] thermal LNXTHERM:01: registered as thermal_zone0 Apr 25 19:32:41 arwen kernel: [ 1.615984] ACPI: Unable to turn cooling device [ffff88022f81abc0] 'on' Apr 25 19:32:41 arwen kernel: [ 1.616017] ACPI: Thermal Zone [THRM] (51 C) acpitool -t gives: [arwen:jcostom](10:36 AM) /home/jcostom$ acpitool -t Thermal zone 1 : passive, 55 C Trip points : ------------- critical (S5): 60 C passive: 50 C: tc1=4 tc2=3 tsp=60 devices=CPU0 active[0]: 50 C: devices= FAN lm-sensors is also both present and started. -- ACPI: Unable to turn cooling... https://bugs.launchpad.net/bugs/63550 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs