Hi, i installed the latest neon (5.14.1 i believe) on a Thinkpad X1 tablet.

beside the unsupported touchpad buttons and suspend mode, the main problem is that on battery i can't make more than 2h.
On windows it lasts forever instead.

how to fix this? i see tp-smapi does not support my machine. is there anything at all i can do?

Have a look at this and similar stuff:

$ apt search thinkpad
Sorting... Done
Full Text Search... Done
acpitool/stable 0.5.1-4+b4 amd64
command line ACPI client

acpitool-dbg/stable 0.5.1-4+b4 amd64
command line ACPI client (debug)

brightd/stable 0.4.1-1+b1 amd64
daemon which regulates brightness of LCDs dynamically

gkrellm-thinkbat/stable 0.2.2-1 amd64
ThinkPad laptops battery status indicator for GKrellM

hdapsd/stable 1:20141203-1+b1 amd64
HDAPS daemon for various laptops with motion sensors

pidgin-blinklight/stable 0.11.1-3+b1 amd64
Blinks your ThinkPad's ThinkLight upon new messages

thinkfan/stable 0.9.3-2 amd64
simple and lightweight fan control program

tlp/stable,stable 0.9-3 all
Save battery power on laptops

tp-smapi-dkms/stable,stable 0.42-1 all
ThinkPad hardware/firmware access modules source - dkms version

tpb/stable 0.6.4-11 amd64
program to use the IBM ThinkPad(tm) special keys

xfce4-goodies/stable,now 4.12.3 amd64 [installed,automatic]
enhancements for the Xfce4 Desktop Environment


May help. Or may not. Who knows…