HORRIBLE 11.10 battery life - fix anytime soon?

[zero2xiii]

hello! i'm not a professional ubuntu user, i have a dell latitude E5420 i5. ubuntu battery life is quite lower than on windows 7. how can i add "those additional parameters to my grub conf"??

Dont even try it. Since you are not experienced enough you can break the system. Easily. So rather stay away for now until a fix is found (if something is broken) and packaged with an update or distro.

[xyzzyman]

Dont even try it. Since you are not experienced enough you can break the system. Easily. So rather stay away for now until a fix is found (if something is broken) and packaged with an update or distro.

How did most of us become experienced without trying?

[aeronutt]

hello! i'm not a professional ubuntu user, i have a dell latitude E5420 i5. ubuntu battery life is quite lower than on windows 7. how can i add "those additional parameters to my grub conf"??

It's pretty simple....but to insure I tell you exactly right, I'll have to wait until I'm home on a linux machine. The basics are...edit one line in one file (/etc/default/grub), run 'sudo update-grub', reboot.

[nebula12]

ok, i'll wait then.. but if something may be dangerous i don't want to try it now. i installed jupiter.but the options are default for each mode, right? i mean, if i choose power saver i don't know what it does to save power..and i don't see any difference on the display, any dim for example.. but if it really works, allright, then!

[aeronutt]

ok, i'll wait then.. but if something may be dangerous i don't want to try it now. i installed jupiter.but the options are default for each mode, right? i mean, if i choose power saver i don't know what it does to save power..and i don't see any difference on the display, any dim for example.. but if it really works, allright, then!

It's an easy, safe, change to make. Others might chime in and show you the details before I get a chance. You can also try it from the grub command line as a temporary (one time) command line, to see if it works. I didn't see any benefit from Jupiter, so I don't use that.

[fuduntu]

ok, i'll wait then.. but if something may be dangerous i don't want to try it now. i installed jupiter.but the options are default for each mode, right? i mean, if i choose power saver i don't know what it does to save power..and i don't see any difference on the display, any dim for example.. but if it really works, allright, then!

Everything Jupiter does is behind the scenes. To get the best benefit from it on Sandy Bridge chipsets, you need to mix it with the kernel parameter tweaks.

[mattia.tamellini]

hello! i'm not a professional ubuntu user, i have a dell latitude E5420 i5. ubuntu battery life is quite lower than on windows 7. how can i add "those additional parameters to my grub conf"??

if you want to try, open a terminal, and do:

sudo gedit /etc/default/grub

then replace the line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

with the line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_osi=Linux i915.lvds_downclock=1 i915.i915_enable_fbc=1 i915.i915_enable_rc6=1"

save, exit go back to the terminal and do:

sudo update-grub

and then reboot your system.

[nebula12]

You can also try it from the grub command line as a temporary (one time) command line, to see if it works. I didn't see any benefit from Jupiter, so I don't use that.

what do you mean by that? it's also safer this way, isn't it?

[aeronutt]

what do you mean by that? it's also safer this way, isn't it?

Do exactly what mattia says and all will be fine. Or, yes, you can do a 'one time' edit by:

At boot, when grub appears with OS boot options (assuming you have multiple boot options), hit 'e' while the OS you're booting to is selected. This will let you edit the kernel options. Move your cursor to the line that starts with 'linux /boot/vm.......' And add your kernel options to then end of that line. ( The options being "quiet splash pcie_aspm=force acpi_osi=Linux i915.lvds_downclock=1 i915.i915_enable_fbc=1 i915.i915_enable_rc6=1"). Hit the key as described at the bottom of the screen to boot (I think it's ctl-x).

This is a one time fix.

[nebula12]

ok, i did it. soon i will see if there is any effect but i think that already my battery signs 4 hours and before rebooting it said 3.. thank you very much.. but if you please explain as far as you can, what was this change that i did in the kernel? it's time for as newbbies to learn something...


edit: but, i think the sign of my battery showing how much time remains has gone a little crazy.. from 4.30 went 2.30 and then 3.10... :S and so on