They are exactly the same on the installations where mbpfan works (different usb stick, same machine).

The above permissions have not changed from earlier kernels when mbpfan worked. Mbpfan is a small daemon designed to control mac fan speed and solve heat problems.Īfter a recent upgrade to 5.8.1 kernal, from 5.7.12, mbpfan does not work,Īug 20 17:19:56 ehost kernel: applesmc: send_byte(0x03, 0x0300) fail:Ġx00 Aug 20 17:19:56 ehost kernel: applesmc: FS! : write data failĮhost mbpfan: Could not set fan speed: Input/output error Aug 20ġ7:21:56 ehost kernel: applesmc: send_byte(0x40, 0x0300) fail: 0x00Īug 20 17:21:56 ehost kernel: applesmc: F0Tg: write data failįS! fail is saying, can't change fan to 'manual,' and F0Tg is the first fan where itįrom looking in /sys/devices/platform/applesmc.768 one can see that even root can only write to fan1_manual, fan1_min, andįan1_output, for example. I'm using the current version of mbpfan (mbpfan-git-2.2.1.r4.g52d8973-1-x86_64) from Arch User Repository, running Arch linux on a MacBookPro 6,1 mid-2010 (on external usb, actually).

Linux mac fan control