<= R1 = mask of available features
bit meaning when set
0 Portable_Speed supported
4 Portable_Idle supported
5 Portable_Stop supported
6 Portable_SMBusOp supported
others 0 (reserved)
Note that since this SWI was added after the A4 laptop was produced, so if a SWI not known error occurs yet the Portable module is present, the default value should be 1 (since the A4 only supports Portable_Speed).
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