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It seems that something in the kernel that affects mbpfan has changed between

Permissions should not be an issue, as I understand that one writes to "fan1_output," which is rw, to set the desired fan speed (counterintuitively).Īs a test, I upgraded another installation with a working mbpfan (kernel 5.7.9) to 5.8.1, and the same no write problem appears. 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).