-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Jan Wildeboer schrieb: > Tom Rathbone wrote: >> Does anyone know anything more about it? What sensor >> is used? How is this event handled in software? > My educated guess is that this is a simple reed-switch connected to a > keyboard event that initiates some ACPI stuff. > Not really rocket science ... Not really, except that it is for sure no ACPI stuff... ACPI, as well as APM, is x86 only and will probably always be. Reason for this is that ACPI is implemented in the BIOS of the machine while embedded systems usually have very specialised power management implemented in the kernel and its drivers. ACPI is intended to be a standard for non standard hardware - shall read, not all PCs are the same but through ACPI they do look the same. For embedded systems ACPI would mean a huge overhead. The Linux kernel 2.6 has a nice power management interface so that drivers can nicely attach various power management callback functions. So for this alone no ACPI or such is needed. Besides, it could also be a hall sensor (changing electrical resistance proportional to statig magnetic field)... :) > MFG > Jan Wildeboer Cheers nils faerber - -- kernel concepts Tel: +49-271-771091-12 Dreisbachstr. 24 Fax: +49-271-771091-19 D-57250 Netphen Mob: +49-176-21024535 - -- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFDXNedJXeIURG1qHgRAnBSAKDrlzGt8MzkXCOFyPHthKP6V4DFogCg1HXd mBzdO412QE28runBmrMprik= =pstk -----END PGP SIGNATURE-----
