On Wed, 28 Jun 2006, David A. De Graaf wrote:
On Tue, Jun 27, 2006 at 02:33:51PM -0400, Matthew Saltzman wrote:
On Tue, 27 Jun 2006, David A. De Graaf wrote:
I haven't accurately measured the comparative rates of battery
discharge while asleep vs. awake because it takes a long time to do
the experiment. I will, though.
I do have the subjective recollection that when the earlier non-ACPI
system slept, the battery drain was very, very low.
OK try the following:
options radeonfb radeon_force_sleep=1
OK that fix is known to solve the Radeon power-consumption-in-suspend
problem. It looks like there is still something else going on and using
the radeonfb driver doesn't fix it.
I've measured the time to discharge two ways using acpitool -b
periodically:
1) The laptop running quiescently, with screensaver operative
2) The laptop in sleep mode, and manually woken periodically
Both runs used kernel 2.6.16-1.2133_FC5 (because the 2139 version
won't work) and the radeonfb radeon_force_sleep=1 option was used.
Running screensaver Sleep mode
Time Charge Time Charge
10:58:43 AM 100 03:11:34 PM 98.54
11:18:43 AM 83.53 03:12:00 PM 98.51
11:38:43 AM 69.76 04:09:30 PM 74.84
11:58:43 AM 58.1 04:41:39 PM 63.4
12:18:43 PM 46.63 05:00:27 PM 56.62
12:38:43 PM 35.13 05:35:23 PM 44.32
12:58:43 PM 23.72 06:00:25 PM 35.45
01:18:43 PM 12.43 07:00:56 PM 14.28
01:38:43 PM 1.34 07:34:55 PM 0.03
08:01:13 PM 31.18
Time to discharge:
2h:40m = 2.67h 4h:24m = 4.40h
That's not very impressive; only 1.65x longer with sleep mode.
I don't think the sleep mode is getting everything turned off that
could be. The operative /etc/acpi/events/sleep.conf action is
acpitool -s
Perhaps there's a more effective way to enter sleep mode.
Any suggestions?
First, are you sure the radeonfb module is being loaded? During the text
part of the boot, the active VC should change to small font/full screen.
If you have a vga= kernel parameter on your kernel line in grub.conf,
remove it. Also, dmesg should report radeonfb statuses, including
radeonfb: forcefully enabling sleep mode
Otherwise, I just suspend/resume using the pm-utils as installed by
default in FC5. I can close the lid or press Fn-F4 to suspend to RAM and
open the lid or press Fn alone (maybe other keys also) to resume. I
haven't used acpitool to suspend. My old FC4 scripts suspended by writing
"mem" into /sys/power/state.
I can suspend to RAM and have it last for a couple of days without
problem.
I've just tried manually running
acpitool -S
which suspends to disk and, to my amazement and surprise, it works!
The laptop totally shuts down and can be awakened with the power
button. It takes somewhat longer, but the power drain is zero.
My amazement is because I don't have a partition set aside for this,
which I thought was necessary.
Apparently it uses the swap space (and that's why one should have a
swap partition as big as RAM, even if you never swap).
Can anyone confirm that?
Yes, it uses swap.
Cool that it works for you. Lat time I tried it, it suspended fine but
hung on resume. Haven't had a chance to try to troubleshoot.
--
Matthew Saltzman
Clemson University Math Sciences
mjs AT clemson DOT edu
http://www.math.clemson.edu/~mjs
