On Thursday 14 November 2019 13:39:01 Guenter Roeck wrote: > I can see two possibilities: Either add a pwm1_enable attribute to > be able to set manual/automatic fan control, I already proposed such patch in past: https://patchwork.kernel.org/patch/9130921/ > > @@ -43,6 +49,8 @@ > > #define I8K_SMM_GET_TEMP_TYPE 0x11a3 > > #define I8K_SMM_GET_DELL_SIG1 0xfea3 > > #define I8K_SMM_GET_DELL_SIG2 0xffa3 > > +#define I8K_SMM_DISABLE_BIOS 0x30a3 > > +#define I8K_SMM_ENABLE_BIOS 0x31a3 This is model or BIOS specific. For example on E6440 are used 0x34a3 / 0x35a3 SMM calls. Because of these platform specific problems we have never incorporated this patch into mainline kernel. Also note that userspace can issue those SMM commands on its own (via sys_iopl or sys_ioperm), fully bypassing such "protection" proposed in this new patch. -- Pali Rohár pali.rohar@xxxxxxxxx
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