When I first installed 16.04 LTS, at kernel 4.4.0, I had a decent battery life of about 3 hours average, but I upgraded to 4.5.2 to solve the suspend problem and some other issues, and now it's less than 1.40 hours, even at low brightness.
What could have caused a drop between the kernels? 4.5.2 is stable, and the same thing happened when upgrading to 4.4.8 (lts).
I'm attaching TLP outputs. I'm desperate to make this a better battery life.
Linux gaj-Lenovo-Z51-70 4.5.2-040502-generic #201604200335 SMP Wed Apr 20 07:37:26 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
I did a tlp -stat output of both kernels in use (4.4.0 and 4.5.2), and the only difference I can notice is that the latest kernel 4.5.2, outputs this, compared to the 4.4.0 which saves battery:
/sys/devices/system/cpu/intel_pstate/min_perf_pct = 18 /sys/devices/system/cpu/intel_pstate/max_perf_pct = 100 /sys/devices/system/cpu/intel_pstate/no_turbo = 0 x86_energy_perf_policy: program for your kernel not installed.
When I try to install linux-tools, as explained at TLP's troubleshooting website, which says
tlp-stat -p shows "x86_energy_perf_policy: program [for your kernel] not installed." Depending on the distro your mileage may vary: Ubuntu: install the meta-package linux-tools (or linux-tools-lts-* for HWE stack kernels), no package available for mainline kernels.
Package linux-tools is a virtual package provided by: linux-tools-virtual 22.214.171.124.22 linux-tools-lowlatency 126.96.36.199.22 linux-tools-generic 188.8.131.52.22 You should explicitly select one to install.
So no tools for 4.5.2 kernel. Or should I install HWE stack tools? What does HWE mean in relation to the stable 4.5.2 kernel?
EDIT: At 4.5.2 I can also hear the fan more frequently and intensely, even at opening Chrome, Skype, etc.
EDIT 2: It might be worth noting that I use a hybrid graphics system INtel and ATI, but I haven't installed any propriertary drivers, or manually upgraded any.
EDIT 3: sudo tail -f -n 1000 /var/log/syslog when starting TLP:
^[[B^[[AMay 5 21:52:57 gaj-Lenovo-Z51-70 kernel: [ 7945.966502] acpi_call: Cannot get handle: Error: AE_NOT_FOUND May 5 21:52:57 gaj-Lenovo-Z51-70 kernel: [ 7945.976707] acpi_call: Cannot get handle: Error: AE_NOT_FOUND May 5 21:53:12 gaj-Lenovo-Z51-70 kernel: [ 7961.360242] acpi_call: Cannot get handle: Error: AE_NOT_FOUND