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This script works for me for doing exactly this. The drawback is that it will continue to set the brightness level even after increasing it manually, when the battery is low, and it does not check if the ac adaptor has been connected. /etc/acpi/events/battery_changed event=battery.* action=/etc/acpi/actions/dim_screen_on_low_battery.sh ...


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It seem there is a bug in the acpi, this could be corrected with a modded DSDT but i don't know how to make it load in Ubuntu (tried and failed on my N551JM) here is what user Vmonheros write about it: The culprit is here, inside method FBST (called inside _BST) Store (Zero, Local0) If (^^LPCB.EC0.ACAP ()) { Store (One, Local0) } So Local0=1 if the ...


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Try to use: http://linrunner.de/en/tlp/docs/tlp-linux-advanced-power-management.html Windows 7 lasts 4.5 on battery, Ubuntu lasted only 2 hours at best... later I installed TLP and Im at 5 1/2 - 6 hours (with Intel GPU in use instead of NVIDIA) Not to mention the fact, that this has been discussed a lot of times...else I wouldnt know about this


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This is a kernel bug reported here: https://bugzilla.kernel.org/show_bug.cgi?id=92111 (many thanks @DougSmythies) Workaround: add acpi_osi= to the kernel cmdline in /etc/default/grub e.g.: GRUB_CMDLINE_LINUX="hid_apple.iso_layout=0 elevator=cfq acpi_osi=" run sudo update-grub afterwards and reboot. This will most likely disable thunderbolt.


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Not all pstates are available when using acpi-cpufreq. You can check the available frequencies (pstates) via: sudo cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies Is 2100 listed? If it is listed, what do you get for: grep MHz /proc/cpuinfo and cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_setspeed Based on your comments, it ...



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