On Sun, Nov 23, 2008 at 8:33 AM, Paul Menzel
<[EMAIL PROTECTED]> wrote:
> Dear Michael,
> (I am also answering to the list.)
>
>
> thank you for your answer.
>
> Am Sonntag, den 23.11.2008, 16:23 +0100 schrieb Michael Gaber:
>
>> Paul Menzel schrieb:
>> > [snip]
>> > 1. Hmm, I do not know why the output no ACPI power usage estimate
>> > available. It was shown before dumping. It was between 0,1 and 0,4
>> > Watts. Running PowerTOP it is also not shown. Strange …
>>
>> perhaps because you're testing it while being plugged in?
>> acpi power estimate is only available when running on battery
>
> No. The cable was not plugged in. And as I said, before the dump it was
> shown.
I have never seen any power estimates in powertop the whole time I
have experimented with it, and I have never heard of anyone else
getting estimates before either. I just assumed it was not possible.
>> > 2. Otherwise the USB device, lxpanel and ntpd are causing a lot of
>> > wakeups. Do you know of any fixes? I enabled USB autosuspend hitting u,
>> > but did not restart anything yet.
>>
>> what usb device is that? are you using it?
>
> There is a built-in webcam and a card reader. I did not use them and I
> do not know if they are connected over USB. Otherwise I had not plugged
> anything in to the system.
the cardreader and webcam are connected via USB 2.0. The camera seems
to drastically drain battery life when enabled, regardless if it is
enabled or not (I do not know if it suspends on the latest kernels now
or not, I have not reran my tests since 2.6.26). not sure what impact
the cardreader has on powerusage, but both options can be disabled in
the bios to save power
as for usb UHCI_HCD is the USB 1.1 compatibility driver which allows
you to use USB 1.1 devices. This causes about 20 wakeup's per second
(last tested kernel, 2.6.26). I compiled it into module form, so I
have it if I need it, but I believe the only USB 1.1 devices in this
day & age is external keyboards & mice.
>> > 3. Are the two suggestions (VM dirty writeback and hal-disable-polling)
>> > also useful for the Eee PC? It has a SSD and no CD drive.
>> >
>>
>> a ssd does also use more power when writing, so increasing the writeback
>> should be useful and perhaps will even help to keep your ssd alive longer ;)
>> disable polling shouldn't do any harm so just try it out
>
> I will.
>
>
> Thanks,
>
> Paul
I've been researching eeepc power reduction tweaks back when I had
some spare time, and I came up with the following suggestions.
* uhci_hcd: this causes 20 wakeup's a second. If you compile your
kernel as a module, and then blacklist it, You will have the ability
to use it when necessary. UHCI is a USB 1.1 driver, to load any
devices not USB 2.0 compliant.
* echo 0 > /sys/class/graphics/fbcon/cursor_blink: This will
disable the blinking cursor in the console. This causes about 20
wakeup's a second when enabled. Note that this does not cause any
wakeup's while Xorg is running.
* echo "vm.dirty_writeback_centisecs=1500" >> /etc/sysctl.conf:
This increases the time data can stay in memory before it is written
to the harddrive. Remember that since this is a laptop with a limited
battery life, you will loose whatever information that is still in
memory when the power dies.
* echo "/proc/sys/vm/laptop_mode=5" >> /etc/sysctl.conf: This will
enable laptop mode
* mount / -o remount,noatime: This disables noatime support for
all files on your root filesystem. atime is the last time a file is
read. This will cause less writes to your drive (Allowing the SSD to
last longer), and free up some IO cycles. This can be done at
boottime, by adding it to your options in /etc/fstab
* echo 0 > /proc/acpi/asus/wlan: This will disable your wireless
network device. When active and connected to a network, madwifi
prevents the kernel from entering the C3 state (which allows more
datterylife). Simply echo 1 to the above file to reenable the device.
* CONFIG_SND_HDA_POWER_SAVE=y &
CONFIG_SND_HDA_POWER_SAVE_DEFAULT=10: These are kernel configuration
options that will allow your soundcard to suspend itself when it has
not been used for 10 seconds. The above kernel configuration kernel
already has this enabled.
* echo 0 > /proc/acpu/asus/camera: This will disable your USB
Camera. (You can reenable this echo 1 to the above file. The usb
camera drastically shortens your batterylife when enabled.
These can also be found on http://www.nathancoulson.com/proj_eee.shtml
(Starting to get a little dated, but still good info)
--
Nathan Coulson (conathan)
------
Location: Brittish Columbia, Canada
Timezone: PST (-8)
Webpage: http://www.nathancoulson.com
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