-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 I have been experimenting with the recent block runtime pm feature and trying to patch the kernel to take advantage of the lower power SLEEP mode instead of STANDBY to save more power, and running into trouble with udisks waking them up.
I knew that udisks already skips its period SMART update if it sees the disk is in standby using the ata CHECK POWER command, so I fixed the kernel to fake this command sand say it is in standby when it is really in sleep mode ( which otherwise forces a link reset, bringing the device out of sleep to issue the check power command ). One problem now seems to be with the runtime pm doing a full spin up to issue the check power command, which I think can be fixed by checking the runtime status in sysfs before issuing the command. The next problem is that when the disk is sleeping, udisks issues an IDENTIFY DEVICE command before the check power. This seems to be coming from libatasmart, which appears to be trying to issue this command when opening the device when it can't find the ID_ATA_SMART_ACCESS attribute. What is this attribute and where is it supposed to come from? -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCgAGBQJSQ51AAAoJEJrBOlT6nu75qpsH/3tW9ka1r6DAFTN6eM4CehiT lOdZKvor1ZgCDIqwjLZQne2uOQZNpw+8GTZeMDJ1QZoc62K5/pXoKB1iwFnmwAOf +8rlupJMlp224LxHuB1tCZMllEV50XtZyI2O0XDnULHMzbIl2Tt1BO3LsVPSxAk2 CXrjysN5jVl2ah5RDXaijPBLqqntiXV6D9ExOsl30ou1Jnsp55IiMBpt4MOGUD45 jN9oIBOKNoXSLs+5eUgIE0/EZ8FC6CqDKw17+AOx9QHYTWXPou8UnCPS39U6wOX4 a/lTeHXRFg8ivv3KIU1MQM4Zwhc0h4A5O8UetFEev86x6OhpieF4C3pY5HPiXdg= =AoDE -----END PGP SIGNATURE----- _______________________________________________ devkit-devel mailing list devkit-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/devkit-devel
