root@beaglebone:/home/william# echo mem > /sys/power/state bash: echo: write error: Invalid argument root@beaglebone:/home/william# uname -r 4.1.22-ti-rt-r59
Replacing "mem", with "disk" pretends to work, but it does not. william@beaglebone:~$ time sudo rtcwake -m disk -s 60 && ls rtcwake: wakeup from "disk" using /dev/rtc0 at Wed May 4 02:52:15 2016 william@eee-pc:~$* sudo screen /dev/ttyUSB0 115200* *( serial debug *) [ 223.71] Kernel pan However, /dev/rtc0 *does* work as a rtc timer aside from sleep. william@beaglebone:~$ *zcat /proc/config.gz | grep CONFIG_HOTPLUG_CPU* CONFIG_HOTPLUG_CPU=y Ok so this is really strange, this being disabled is supposed to be *the* reason for write failure to "mem". On Tue, May 3, 2016 at 6:44 PM, Robert Nelson <[email protected]> wrote: > > > On Tue, May 3, 2016 at 8:10 PM, <[email protected]> wrote: > >> Should power management functions (mem/standby) be working with 4.x TI >> kernels on the BeagleBone Black for at least some subset of hardware >> versions? Or was full support intentionally disabled due to hardware >> related issues? >> >> I've been using 3.14 TI kernels with the rtcwake command (both mem and >> standby work), but cannot find anything that works on the same hardware >> with 4.x TI kernels after looking at wkup_m3 and rtc-omap drivers. >> > > v4.1.x-ti is the best, but just tested v4.4.x-ti this morning: > > at idle: > > current CPU frequency is 300 MHz (asserted by call to hardware). > cpufreq stats: 300 MHz:60.64%, 600 MHz:2.75%, 800 MHz:0.00%, 1000 > MHz:36.60% (14) > root@beaglebone:~# uname -r > 4.4.8-ti-r22 > > 5v @ 0.15~0.18 Amps on my jumpy power supply... > > echo mem > /sys/power/state > > 5v @ 0.05 Amps > > bbb: rev a5a, just a ftdi serial cape attached. > > Regards, > > -- > Robert Nelson > https://rcn-ee.com/ > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/CAOCHtYijfoUf3rnTAJ-WLX9gQGKQ68Jw-6-ub%2BU3OXaaBRVBBw%40mail.gmail.com > <https://groups.google.com/d/msgid/beagleboard/CAOCHtYijfoUf3rnTAJ-WLX9gQGKQ68Jw-6-ub%2BU3OXaaBRVBBw%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORq2BWjW3YZa4mZ0OicDPuz_2xgh%2BWFD7x-%2BVCFV15LSzQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
