[ltp] [W510] decreasing power use, increasing battery life:
screen and lid issues
Tue, 4 Dec 2012 14:03:32 +0200
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On Mon, Dec 03, 2012 at 05:37:17PM -0800, Tom Roche wrote:
> Can I get advice on ways to improve a Thinkpad W510's battery life when
> running debian?
Have you tried powertop?
>I'd especially like to improve its power management,
> * allowing screen brightness control via Fn-Home/Fn-End
I'd say this is worth reporting as a bug, if you can figure out which
component is dropping the ball.
What's your desktop environment?
> * making the close-lid event just turn off the screen, instead of
> sleeping the box (i.e., suspending to RAM)
> I recently got a W510 on closeout (pretty good price). I installed LMDE
> (a testing/wheezy-based distro), but am only getting slightly more than
> 2 hours use from a fully-charged battery. This is usually plenty, but
> this week I'm traveling at a conference where the meeting rooms seem to
> have no accessible power outlets :-(
> One major problem seems to be screen power management: the screen is
> always on full brightness, and cannot be reduced by Fn-End.
One of the many possible ways of changing screen brightness is to adjust
the 'brightness' property via xrandr. (Name of the property may depend
on your video driver -- mine's intel).
There's also xbacklight.
And some magic files in /proc or /sys that probably shouldn't be
And the screen brightness applet in GNOME System Preferences.
> Another major problem is, closing the lid does not (solely) turn off the
> screen: instead, it sleeps the box. This means I am sometimes forced to
> keep the lid up and screen on when not necessary. Note I have made the
> appropriate change in the gnome-power-manager UI, but the behavior of
> the box does not change.
For the record, in recent GNOME versions gnome-power-manager is no
longer used; power management is handled by gnome-settings-daemon's
It's possible that the two keep their configuration in different places.
$ gsettings list-recursively|grep lid
org.gnome.settings-daemon.plugins.power lid-close-ac-action 'nothing'
org.gnome.settings-daemon.plugins.power lid-close-battery-action 'nothing'
works for me (GNOME 3.6, Ubuntu 12.10).
> I thought I could fix at least the first problem by switching the video
> driver from nouveau to nvidia proprietary, but that breaks boot, as
> described here
> So I'd appreciate other suggestions (as well as advice regarding ways to
> roll back the nvidia install!)
I see that rescue mode doesn't help. And init=3D/bin/bash is problematic
when you've got an initramfs. Can you boot from a LiveCD, mount your
filesystem, chroot, then uninstall the nvidia packages? You may also
need to manually mount /proc and /sys inside the chroot if
uninstallation of any of those packages triggers update-initramfs.
(I avoid laptops with NVidia graphics for a reason.)
Favorite MAC error message: "Not enough memory to eject disk!"
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