I'm struggling with the battery life of this laptop while running Lubuntu. In Windows 10 I'm able to get up to 9.5 hours of life in power save mode. But in Lubuntu 100% charge lasts about 2.5 hours.
The laptop specs are:
- Nvidia GTX 1060 Max-Q
- Intel i7 7700hq (8 threads)
(Yeah I know, I'm using Lubuntu in this machine, I just like Lubuntu very much)
I have display brightness at absolute minimum,
powertop auto-tuned. When running
prime-select query it returns
intel so I'm supposedly using only the intel GPU. I even tried decreasing the maximum speed of the processor to 800Mhz with
cpufreq frequency-set -u 800mhz. With all this settings the laptop lives at maximum something like 3 hours, but not more than that. Powertop reporst a discharge rate between 17W and 22W
However, when running plain Ubuntu 18.04 with gnome, in a live USB, with nothing installed, it drains so less battery, I get around 5 to 7 hours of estimated life, powertop reports a discharge rate of 11W or less.
I don't install Ubuntu simply because I really dislike Gnome take on UX (nautilus type-ahead removal, no shutdown without prompt option, etc), and I already have Lubuntu set up with all my necessities.
I tried another distros (Mint, Elementary, KDE Neon, Budgie) in Live USB but none of them consumed so little battery as Ubuntu did, they were around 10W and 15W. My theory is that since Dell supports Ubuntu in many of their laptops (this one at least you can get it with Ubuntu), they made some fine tunning with Canonical, that didn't go directly to Ubuntu derivatives like Lubuntu.
Also I have to note that powertop reports are really weird, saying that Display Backlight consumes up to 18W at times even though the display is at minimimum brightness, I think the nvidia drivers could be a possible cause (maybe the two gpus are working simultaneusly somehow?). Also it reports that the ethernet port is draining 1W o 2W when I'm using only wifi.
In the hardware side of things, I'm pretty sure my laptop is taking a lot of heat even when it is doing nothing (like 50°C), and I'm seeing the "fully charged" capacity of my battery going down in these days to 87% in less than two months.
Here is a powertop overview screenshot.
EDIT: Immediatly after posting I rebooted the pc into the Live CD to take the next screenshot, this is right after the previous screenshot with almost the same amount of battery