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Old 18th July 2012, 09:28 PM
Becks21 Offline
Registered User
Join Date: Apr 2012
Location: Germany
Posts: 31
Increasing Battery-Time

Hi there,

after installing Fedora 17 plus latest updates on my new laptop I had an estimated Battery-Time of roughly 2 hours (display dimmed to minimum, wlan on, internet surfing with chrome).

I tried to increase the Battery-Time by doing the following:

modified fstab (I am using an Intel 520 SSD, no swap drive since I have 16gb mem):
/dev/mapper/luks-ad7f76c3-2de3-4bd3-a17b-a583e8493b26 /                       ext4    defaults,noatime,discard        0 1
UUID=f8ac4308-35bb-4b45-a340-8cf8c77edf61 /boot                   ext4    defaults,noatime,discard        0 1
disabled the discrete gpu (ati 7970m):
echo "OFF" > /sys/kernel/debug/vgaswitcheroo/switch
added the following kernel parameters:
pcie_aspm=force acpi_osi=Linux i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1
finally used powertop to switch all "bad" entries to "good"

The final result for unplugged, min-dimmed usage like websurfing is now at >4 hours (at 70% I still see 3 hours of estimated battery power)


Now my questions:

- Is there anything which I can do to further increase the battery time?
- Which of the kernel options make no sense, or why do I have to set them manually?
- How can I "automatically" repeat the powertop actions.. why are those not stored/remembered?
- what am I missing


I just figured that the kernel param "acpi_backlight=vendor" seems to cause problems in that I cant set the brightness manually anymore.. which is strange because I previously rebooted to with this kernel param and brightness control worked..

Last edited by Becks21; 18th July 2012 at 11:59 PM. Reason: acpi_backlight=vendor causes problems
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Old 19th July 2012, 06:09 AM
Catastrophe Offline
Registered User
Join Date: Dec 2009
Posts: 50
Re: Increasing Battery-Time

take a peek here

worked wonders for me.
ASUS g74sx-bbk7 -- Fedora 17 x64
Intel CORE i7 2630QM @2GHz // nVidia GeForce GTX 560M 2GB // 8GB DDR3 1333 MHz SDRAM // 2 x 500GB 7,200rpm
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Old 20th July 2012, 07:28 PM
Becks21 Offline
Registered User
Join Date: Apr 2012
Location: Germany
Posts: 31
Re: Increasing Battery-Time

Alright thx a lot for the link !
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batterytime, increasing

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