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ThinkPad X240

This page gives an overview of the ThinkPad X240 (machine types 20AL and 20AM).



  • 305.5 mm x 208.12 mm x 20.3 mm
  • Weight: 1.36 kg


  • Intel HD4400 Graphics integrated into CPU
  • Up to 8GB of RAM (PC3-12800 DDR3L SDRAM 1600MHz SODIMM) in a single socket
  • One of the following TFT displays:
    • 12.5" HD (1366 x 768)
    • 12.5" HD IPS (1366 x 768)
    • 12.5" HD IPS Touch (1366 x 768)
    • 12.5" FHD IPS (1920 x 1080)
    • 12.5" FHD IPS Touch (1920 x 1080)
  • 2.5" × 7mm hard drive bay with one of the following hard drives:
    • HD
      • 320GB (7200 rpm) OPAL
      • 1TB (5400 rpm)
      • 500GB (7200 rpm)
    • SSD
      • 128GB / 512GB SSD SATA3
      • Intel® 180GB SSD SATA3
      • 256GB SSD eDrive (OPAL 2.0)
  • M.2 slot with, optionally, one of the following:
    • 16GB SSD (SATA 42mm M.2 NGFF, type 2242)
    • Ericsson N5321 WWAN "Integrated Mobile Broadband" -
    • Gobi 5000 (Sierra Wireless EM7355) WWAN "Integrated Mobile Broadband"
  • Display connectors
    • Mini DisplayPort port with audio
    • VGA port
  • 3.5mm Headphone+Mic combo jack
  • 2 x USB 3.0 ports, one of which is "Always on" for power
  • 4-in-1 SD card reader (SD / SDHC / SDXC / MMC slot)
  • Smart card reader (optional)
  • Ethernet: Intel® 82577LM Gigabit (Hanksville)
  • Wireless, one of the following:
    • Intel Dual Band Wireless-AC 7260 (2x2, 802.11ac/a/b/g/n, BlueTooth 4.0)
    • Intel Dual Band Wireless-N 7260 (2x2, 802.11abgn, BlueTooth 4.0)
  • NFC Transmitter
  • 720p HD Integrated camera
  • Batteries:
    • Internal (front) battery: 23.2Whr 3 cell Li-Polymer (optional)
    • External (rear) battery: one of
      • 23.2Wh 3 cell Li-Polymer (Type 68)
      • 72Wh 6 cell Li-Ion (Type 68+)
    • External battery can be swapped while running on the internal battery ("Power Bridge")
  • Kensington lock
  • Integrated Fingerprint Reader (optional)
  • VGA connector
  • Compatible docking stations:

ThinkPad X240

RAM upgradability

This model has a single SODIMM socket, which supports up to 8GB of RAM (PC3-12800 DDR3L SDRAM 1600MHz SODIMM).

The CPU does not support more than 8GB of RAM per SODIMM module. In particular, Linux and Windows fails to boot, and MemTest86+ crashes, when using a 16GB SO-DIMM module, model IMM2G64D3LSOD8AG-B15E from Intelligent Memory (which does work in a ThinkPad X250).


Any internal component replacement or upgrade (including hard disk and expansion cards) requires opening the back cover. Keyboard replacement requires full assembly and disassembly of the system board, and fresh thermal paste for the CPU heatsink.

Opening the case involves two stages:

  • Opening a handful of screws (these have tiny retainer rings made of transparent plastic; be careful not to drop them when removing the back cover).
  • Carefully prying apart dozens of little fragile plastic latches. This requires a plastic case opening tool to avoid damage (a metal screwdriver will nick and scratch the plastic).

Key mapping

This model has a 6-row keyboard, where the F1 through F12 share the same top-row physical keys with special functions keys (volume, brightness, etc.). By default, the top-row keys invoke the special functions, and require Fn keypress to invoke the usual F1 through F12 functions. To switch the role and have the top-row keys default to F1 through F12, enable Fn-Lock mode (by pressing Fn+Esc).

Moreover, End and Insert share the same physical key. When Fn-Lock is activated, the key default to Insert, and End is invoked as Fn+Insert, which many users find inconvenient. To switch the End and Insert functions, in modern Linux distribution, add the following in a new file /usr/lib/udev/hwdb.d/61-ThinkPad-X240-keyboard.hwdb:

# ThinkPad X240: switch End and Insert keys (so that when Fn-Lock is enabled, End works without Fn).

Then run: # udevadm hwdb --update

(The keyboard:... line matches /sys/devices/virtual/dmi/id/modalias, and the hex scancodes are found using # evtest /dev/input/by-path/platform-i8042-serio-0-event-kbd . )


Resources (by Lenovo)

Other Documents