Curiously, my hard disk appears to only support four values, indicating that it possibly ignores most bits of the value. Any value <= 127 comes back as 1.
dan...@thinkpad:~$ sudo hdparm -B 255 /dev/sda /dev/sda: setting Advanced Power Management level to disabled APM_level = off dan...@thinkpad:~$ sudo hdparm -B 254 /dev/sda /dev/sda: setting Advanced Power Management level to 0xfe (254) APM_level = 254 dan...@thinkpad:~$ sudo hdparm -B 253 /dev/sda /dev/sda: setting Advanced Power Management level to 0xfd (253) APM_level = 128 dan...@thinkpad:~$ sudo hdparm -B 127 /dev/sda /dev/sda: setting Advanced Power Management level to 0x7f (127) APM_level = 1 My disk is a Samsung HM251JJ, firmware version 2AA00_00 -- [maverick] HD spins down all the time on AC https://bugs.launchpad.net/bugs/606706 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
