nanogui: VTSWITCH vs. Timers vs. Sleep Mode
Subject:
Re: [nanogui] VTSWITCH vs. Timers vs. Sleep Mode
From:
"Greg Haerr" ####@####.####
Date:
30 Nov 2006 23:55:33 +0000
Message-Id: <013f01c714da$fe1c1db0$6401a8c0@winXP>
> HOWEVER, I've come to realize that the reason I had VTSWITCH set to 'Y'
is because if it is not, then I cannot place my hardware into sleep mode
using the power manager, i.e. writing "mem" to /sys/power/state. I
don't understand how VTSWITCH and the power state are connected but if I
have VTSWITCH set to 'N', then the unit just hangs up and does not enter
the sleep state.
Hmmm. You should study the vtswitch.c code carefully, I can
think of a couple possibilities: perhaps without vtswitch, the system
never assigns a text console and it can't determine when the system
should sleep? Also try commenting out a few lines of the vtswitch
code while enabled, (like the signal() calls, then ioctl()s). This
will give a better understanding of what is required for your
power manager.
Regards,
Greg
