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# Lenovo ThinkPad X1 Carbon

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This article or section does not follow the Laptop page guidelines.

Reason: Needs a hardware table and a function keys section (Discuss in Talk:Lenovo ThinkPad X1 Carbon)

Lenovo ThinkPad X1 Carbon (X1C). There is also a touch version. Comes without optical drive. Has UEFI BIOS with BIOS-legacy fallback mode.

Note: This article is about the 1st generation model introduced in 2012. For more recent generations, see Category:Lenovo.

## Booting

### Legacy-BIOS

Boot into your BIOS and change the boot mode to Legacy. Then simply follow the normal installation guide.

### Hanging on "HWP enabled" message

This is due to a bug introduced in Linux 4.4. To work around it, add `intel_pstate=no_hwp` to your kernel parameters.

## Hardware

Almost everything works out of the box.

### Audio

Sound works out of the box.

#### Xbindkeys

For alternative window managers (Fluxbox, etc..), try installing xbindkeys and adding the following to `~/.xbindkeysrc`:

    "amixer -c 0 set Master 1dB-"
      XF86AudioLowerVolume
    "amixer -c 0 set Master 1dB+"
      XF86AudioRaiseVolume

### Network

Wired networking works out of the box with the Ethernet to USB adapter. Wireless works out of the box using the `iwlwifi` module.

    $ lspci

    Network controller: Intel Corporation Centrino Advanced-N 6205 [Taylor Peak] (rev 96)

### Touchscreen

Works out of the box. To enable multi-touch, install Touchegg.

### Video

The video card installed is Intel HD Graphics 4000. See intel for more info.

#### Brightness control

Default brightness adjustment keys work but need to be pressed multiple times to increase/decrease the screen brightness. Use either the #Xbindkeys_2 or #ACPI methods to fix this.

Some desktop environments may lack granularity while changing brightness. This is due to the DE (e.g. gnome-settings-daemon) along with the internal graphics module changing the brightness when brightness adjustment keys are pressed causing multiple steps per press. To work around this add the kernel parameter `video.brightness_switch_enabled=0`.

##### Xbindkeys

Install xbindkeys and append the following to `~/.xbindkeysrc`:

    "xbacklight -dec 5"
      XF86MonBrightnessDown
    "xbacklight -inc 5"
      XF86MonBrightnessUp

##### ACPI

Writing custom ACPI handlers for the brightness adjustment keys seems to have no effect. In order to use them properly you need to add the kernel parameter `acpi_osi="!Windows 2012"`. See also Backlight#ACPI. Note that the ACPI backlight is disabled by default on Windows 8 hardware with a native backlight. Consider using the #Xbindkeys approach instead.

#### Wrong EDID for external display

With certain connectors (e.g. MiniDP to VGA), there is a bug getting EDID for the external screen while booting:

    [ 93.736330] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up

This does not occur if the external screen is connected after booting.

The correct mode can be added per xrandr#Adding undetected resolutions:

    xrandr --newmode 1920x1200_60 154 1920 1968 2000 2080 1200 1203 1209 1235 -hsync +vsync
    xrandr --addmode DP1 1920x1200_60
    xrandr --output DP1 --mode 1920x1200_60

### KMS

Enable KMS using the `i915` module and by enabling VT in BIOS.

### Webcam

Works out of the box. Tested with guvcview

### Fingerprint Reader

Works out of the box with Fprint.

For a GUI, fingerprint-guiAUR is already patched to work with the X1's newer fingerprint reader. To get the gui's dropdown to recognize your device, you will have to add your user to the `plugdev` group:

    $ gpasswd -a <username> plugdev

See fingerprint-gui for more information about config

    $ lsusb

    147e:2020 Upek TouchChip Fingerprint Coprocessor (WBF advanced mode)

### WWAN (Mobile broadband)

This model includes a Ericsson H5321gw adapter that can be used as a mobile broadband adapter and GPS.

The SIM-card must be inserted in the back of the laptop.

Add text to the following file and reboot

    /etc/modprobe.d/avoid-mbib.conf

    options cdc_ncm prefer_mbim=N

Tested OK with NetworkManager with modemmanager installed

    $ lsusb

    0bdb:1926 Ericsson Business Mobile Networks BV

### GPS

Install gpsd and mbm-gpsd-gitAUR. Add this to the following file

    /etc/udev/rules.d/99-mbm.rules

    ATTRS{idVendor}=="0bdb", ATTRS{idProduct}=="1926", ENV{ID_USB_INTERFACE_NUM}=="09", ENV{MBM_CAPABILITY}="gps_nmea"
    ATTRS{idVendor}=="0bdb", ATTRS{idProduct}=="1926", ENV{ID_USB_INTERFACE_NUM}=="03", ENV{MBM_CAPABILITY}="gps_ctrl"

Reboot to reload udev rules.

Run

    # mbm-gpsd

See if there is GPS-output

    $ cat /dev/gps0

Run

    # gpsd -b -N /dev/gps0

To test it

    $ xgps

Or use e.g. foxtrotgpsAUR in AUR.

See this link for more info.

    $ lsusb

    0bdb:1926 Ericsson Business Mobile Networks BV

### Keyboard backlight

Works out of the box. Use FN+Space

### Bluetooth

First try to set up Bluetooth normally. If you get kernel error messages:

    kernel: bluetooth hci0: Direct firmware load for brcm/BCM20702A1-0a5c-21e6.hcd failed with error -2
    kernel: Bluetooth: hci0: BCM: Patch brcm/BCM20702A1-0a5c-21e6.hcd not found

You need to manually install the proprietary firmware. The slackware wiki describes one way to do this: https://www.slackwiki.com/Btfirmware-nonfree.

### Mouse/Touchpad

Works out of the box. See TrackPoint for additional details.

### Docking

This model has no docking port.

Video for USB 3 Docking Stations currently is not supported, so you must use a USB Port Replicator with Digital Video (USB 2.0)

This supports:

- USB-devices connected to dock
- Audio
- Microphone
- Ethernet
- Video (see DisplayLink)

## See also

- Installing and configuring Arch Linux on ThinkPad X1 Carbon
- https://www.thinkwiki.org/wiki/ThinkWiki

Category:

- Lenovo

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