there's an off-by-1 in 2.6.16.9 (and 2.6.17-rc2)
kernel/power/main.c:state_store() ... if your kernel just happens to have
some non-zero data at pm_states[PM_SUSPEND_MAX] (i.e. one past the end of
the array) then it'll let you write anything you want to /sys/power/state
and in response the box will enter S5.
i randomly discovered this because i really wanted to put my box into S5
(for wake on lan) and tried "echo off >/sys/power/state" and was quite
happy that the box entered S5... happy until i compiled a different kernel
and this S5 trick stopped working :)
anyhow, this begs the question, what is the correct way to get a box to
shutdown into s5? on a fc4 box i have here it does that happily, but
ubuntu boxes don't seem to go into s5... and i couldn't figure out from
fc4 patches if they'd changed anything in this area. pointers
appreciated.
btw i can whip up a patch making "off" a valid value for /sys/power/state
...
-dean
Signed-off-by: dean gaudet <[email protected]>
--- linux/kernel/power/main.c.orig 2006-03-19 21:53:29.000000000 -0800
+++ linux/kernel/power/main.c 2006-04-21 20:54:12.000000000 -0700
@@ -272,7 +272,7 @@
if (*s && !strncmp(buf, *s, len))
break;
}
- if (*s)
+ if (state < PM_SUSPEND_MAX && *s)
error = enter_state(state);
else
error = -EINVAL;
-
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