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Revision as of 09:46, 2 May 2017 by Petermolnar (Talk | contribs) (adding "Known linux issues & fixes" section to X250)
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ThinkPad X250

This page gives an overview of the ThinkPad X250.

Standard Features

  • One of the following ultra-low-voltage Broadwell-U processors:
    • Intel Core i3-5010U, 2,10 GHz, 3MB Cache
    • Intel Core i5-5200U, 2,2 - 2,7 GHz, 3MB Cache
    • Intel Core i5-5300U, 2,3 - 2,9 GHz, 3MB Cache, Intel vPro
    • Intel Core i7-5600U, 2,6 - 3,2 GHz, 4MB Cache, Intel vPro
  • One of the following graphics adapters:
  • One of the following displays:
    • 12.5" 1366x768 ("HD"), LED-Backlight, 200 cd/m², 300:1
    • 12.5" 1366x768 ("HD"), LED-Backlight, 300 cd/m², 700:1, IPS
    • 12.5" 1366x768 ("HD"), LED-Backlight, 270 cd/m², IPS, Multitouch
    • 12.5" 1920x1080 ("Full HD"), LED-Backlight, 400 cd/m², 700:1, IPS
    • 12.5" 1920x1080 ("Full HD"), LED-Backlight, 360 cd/m², IPS, Multitouch
  • Up to 8GB DDR3L PC3-12800 1333MHz (1 DIMM Slots) (unofficially 16GB modules reportedly working by multiple users)
  • One of the following hard drives:
    • SSD, SATA 6.0Gb/s, 2.5" wide, 7mm high
    • HDD, SATA 6.0Gb/s, 2.5" wide, 7mm or 9.5mm high (9.5mm is in official spec but not yet confirmed by users)
    • SSHD with 8GB NAND flash memory
  • M.2 slot with, optionally, one of the following:
    • M.2 SSD
    • Wireless WWAN, Ericsson N5321, HSPA+ 21Mbps/GSM/GPRS/EDGE, GPS
    • Wireless WWAN, Sierra Wireless EM7345,
  • Cellular WWAN
    • via optional M.2 card (see above)
    • Externally-accessible SIM tray. Stock tray accepts micro-SIM. The socket is also compatible with the mini-SIM (regular size) holder from the X240.
  • WLAN (WiFi and BlueTooth):: one of the following, via M.2 slot:
    • 802.11b/g/n, ThinkPad 11 b/g/n, 2x2, Wi-Fi + Bluetooth
    • 802.11b/g/n, Intel Wireless-N 7265, 2x2, Wi-Fi + Bluetooth
    • 802.11a/b/g/n, Intel Dual Band Wireless-N 7265, 2x2, Wi-Fi + BlueTooth
    • 802.11ac, Intel Dual Band Wireless-AC 7265, 2x2, Wi-Fi + BlueTooth
  • 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)
  • 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")
  • Integrated Fingerprint Reader (optional)
  • Dimensions:
    • Touch: 305.5mm x 208.5mm x 21.5mm (12.0" x 8.21" x 0.85")
    • Non-touch: 305.5mm x 208.5mm x 20.3mm (2.0" x 8.21" x 0.80")
    • Weight: 1.42kg (internal battery + 3-cell external battery, non-touch) to 1.65kg (internal battery + 6-cell external battery, touch)

ThinkPad X250


RAM upgradability

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

In practice, some 16GB DRAM modules work in this machine. In particular, the 16GB DDR3L 1333MHz SODIMM DRAM module from Intelligent Memory, model IMM2G64D3LSOD8AG-B15E, is reported to work well by multiple users.

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).

Known linux issues & fixes

Complete lockup with nothing in logs on Debian

The solution that worked for most:

create a file named `/etc/X11/xorg.conf.d/20-intel.conf`, add the following and reboot:

   Section "Device"
       Identifier "Intel Graphics"
       Driver "intel"
       Option "DRI" "false"
       Option "AccelMethod" "uxa"
       Option "NoAccel" "True"