I'm using an Lenovo x1 carbon (gen1) and have Ubuntu 14.04 and tlp installed. I'm really dissapointed about the battery life. Some people claim to have 6 hours (https://dague.net/2014/01/11/thinkpad-x1-carbon-awesome-linux-laptop/) and even sometimes 8 hours (Thinkpad X1 Carbon - terrible battery life on Raring).
I usually get 3 hours with reduced screen brightness (3 tips) with moderate usage like browsing the web, looking at pdfs and doing some programming. What battery life do you get and please post your powertop otherwise I can't believe those 6 or 8 hours... Here is mine:
The battery reports a discharge rate of 10.7 W The estimated remaining time is 3 hours, 22 minutes Summary: 627.5 wakeups/second, 13.9 GPU ops/seconds, 0.0 VFS ops/sec and 12.1% Power est. Usage Events/s Category Description 3.55 W 60.0% Device Display backlight 708 mW 8.0 ms/s 138.4 Interrupt PS/2 Touchpad / Keyboard 584 mW 13.4 ms/s 106.0 Process /opt/google/chrome-unstab 575 mW 3.1 pkts/s Device Network interface: eth0 ( 370 mW 21.3 ms/s 59.3 Process compiz 319 mW 0.1 pkts/s Device nic:vmnet8
So usually my display, chrome and wifi is draining my battery most. Further I use my laptop extensively since one year and already lost 18.2% of my battery capacity (37.6 Wh left).
The keyboard uses that much power since I upgraded to 14.04. Anybody else noticed this?