I presently have a Dell XPS 15z (L511z) (+ 240GB SanDisk Extreme SSD Upgrade).
I also have Ubuntu Gnome 13.04 installed. My BIOS is at the latest version.
I have the following power-related packages installed: bumblebee, pm-utils, acpi, acpi-call-tools, powernap, powerwake, smartdimmer, and tlp
I use the following boot commands: acpi_backlight=vendor dell_laptop.backlight=0 pcie_aspm=force i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 drm.vblankoffdelay=1 vt.handoff=7 quiet splash acpi_osi=linux
I am only getting 2.5 hours of battery life now. It's horrible. I was getting 4-6 hours of battery life when I had Ubuntu 12.04 with bumblebee and laptop-mode-tools installed.
My laptop should be getting 5 hours of battery life on average. I can get that in Windows 8 x64 with high-performance mode turned on for the battery mode.
Why can't I get that on Ubuntu any more? I used to be able to, prior to Ubuntu 12.10.
I NEED HELP. I have tried as much research as I could find, no luck.
Does anyone know how I can get AT LEAST 4 hours of battery, WITHOUT throttling my CPU or dimming my display more than reasonable? Suggestions?