The third-gen Thinkpad X1 Carbon: a little annoying at first: no SD slot, no h/w kill switch for the wireless, no spill-through keyboard (wtf guys, that was brilliant!). About 6 months in, the video glitches started: there is a short which corrupts video memory while using wifi. The fix, of course, is a replacement system board, which is great if you have a spare third-gen X1 Thinkpad Carbon lying around and can just up and change workstations like it's no big. Workaround: rfkill block wifi, or just get used to the strobe effect.
The latest: Thinkpad X1 Yoga. And let's just put it out there: this doesn't work out of the box like the previous two did. Lenovo and Intel seem to have backed off of their Linux commitment, though that's probably half their users these days (errybody else on the mobile, right?)
Here's the rundown on getting the X1 Yoga up and running with a Linux install.
Basic Linux
Debian 8.3.0 AMD64 netinst ISO if you were wise enough to buy the OneLink+ RJ45 ethernet adapter; otherwise, use the regular (non-netinst) ISO.
Use unetbootin to make a USB flash drive image for this. Go into the BIOS on the X1 Yoga, enable F12 for boot device selection (just because), turn off secure boot, maybe enable diagnostic boot as well. No need to allow legacy BIOS installs, Debian will work just fine with uEFI (unlike FreeBSD where you need to use the 10.3-Beta or 11 memstick). Go through the install like you usually do. Your ethernet (if you have it) will be detected (again, unlike in FreeBSD).
Sound, APCI (suspend, hibernate, and battery status) and video card should all be working out of the box.
Wireless
Upgrade your kernel to 4.4.1 from the ubuntu PPA:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.1-wily/
This is per notes about a typo in the iwlwifi driver at
https://bbs.archlinux.org/viewtopic.php?id=206831
Looking at the kernel source, 4.2.7 has the fix as well, but might as well go with the latest stable release of the kernel if we're upgrading.
You'll also need to upgrade the firmware, or your Wifi will not be recognized. There is a debian package in backports for this:
https://packages.debian.org/jessie-backports/firmware-iwlwifi
Skylake P-State Fix
If you rebooted excitedly into your new kernel without following the rest of these steps, you're likely looking at a blank screen. That's because of a skylake p-state bug reported here:
https://www.reddit.com/r/thinkpad/comments/410haw/yoga_260_wont_boot_ubuntu_with_kernel_4244_but/
This is because the kernel needs a command line parameter to not totally crap itself when it encounters Skylake's poor implementation of pstate.
To fix this, change the cmdline in /etc/default/grub to:
GRUB_CMDLINE_LINUX_DEFAULT='intel_pstate=no_hwp quiet'
Don't forget to run update-grub when you're done.
Hopefully this will go away in 4.5; according to a commenter, that's what the kernel guys are trying for.
i915 Xorg Video fix
Of course, the fancy new kernel hosed your X windows, didn't it?
Not sure why there's such a tight coupling there, but never mind. This one's an easy fix, per http://comments.gmane.org/gmane.linux.debian.user/508779 . Download (and install) a new version of the xserver-xorg-video-intel package from backports:
https://packages.debian.org/jessie-backports/xserver-xorg-video-intel
Touchscreen
The touchscreen is recognized and configurable in X Windows,
The touchscreen (+ stylus) works out of the box once the firmware update is installed (via windows, sadly,so don't pave the drive until you've updated firmware). Make sure to perform a hard reset (60 sec with a paperclip in the bottom of the laptop) after the upgrade.
To disable the touchpad when entering tablet mode (note: the keyboard will be disabled by the BIOS), create the file /etc/acpi/events/thinkpad-tablet-touchpad-off with the following contents:
event=ibm/hotkey LEN0068:00 00000080 000060f0
action=/usr/local/bin/touchpad_disable.sh
You can verify the hotkey parameter by running acpi_listen and folding the display back to tablet position.
Next, create the file /usr/local/bin/touchpad_disable.sh with the following contents:
export XAUTHORITY=`ls -1 /home/*/.Xauthority | head -n 1`
export DISPLAY=":`ls -1 /tmp/.X11-unix/ | sed -e s/^X//g | head -n 1`"
tp_dev='SynPS/2 Synaptics TouchPad'
state=`xinput list-props "$tp_dev" | grep 'Device Enabled' | cut -d':' -f2 | tr -d '\t '`
if [ $state -eq 1 ]
then
xinput disable "$tp_dev"
else
xinput enable "$tp_dev"
fi
You will need to give root access to the X server session for this. The quickhack version is to add xhost + & to ~/.xsessionrc, but it's better to do something like +root@localhost..
The Acer BMA150 accelerometer is detected as a joystick device, so various /sys/bus/iio -based screen orientation scripts like thinkpad-yoga-scripts won't work. An alternative is to define a Window Manager screen edge event that invokes a script to cycle through screen orientation rotations:
#!/bin/sh
# script to rotate screen (counter-clockwise) based on current orientation
conn_line=`xrandr | grep ' connected'`
dev=`echo "$conn_line" | cut -d' ' -f 1`
orient=`echo "$conn_line" | cut -d' ' -f 5`
case $orient in
'(normal' )
xrandr --output $dev --rotate left
;;
'left' )
xrandr --output $dev --rotate inverted
;;
'inverted' )
xrandr --output $dev --rotate right
;;
'right' )
xrandr --output $dev --rotate normal
;;
* )
xrandr --output $dev --rotate normal
;;
esac
Some other approaches are discussed in this Manjaro Linux post.
Fingerprint reader
Is not supported by fprint. USB ID: 138a:0090 (Validity, no product string in usb-devices).
Camera
Works out of the box. Driver is uvcvideo. VLC mirrors it without any problems:
vlc v4l:// :v4l-dev="/dev/video0" :v4l-adev="/dev/audio"
FreeBSD
You need to use a 10.3 (BETA3 or more current) UEFI memstick image to do the install with, of course, the OneLink ethernet adapter connected. Presently, no support for wifi or Xorg support (perhaps in 11?). To boot, add an entry in /etc/grub.d/40_custom as follows:
menuentry "FreeBSD 10.3-BETA3" {
insmod chain
set root=(hd0,gpt10)
chainloader (hd0,gpt10)/boot/loader.efi
}
...replacing gpt10 with the partition number where FreeBSD was installed. This starts counting from 1, so the example here is the tenth partition on the first hard drive (hd0).
Note that for update-grub to correctly recognize the FreeBSD partition (and therefore find loader.efi), you should provide an fstab entry to specify the UFS partition type:
/dev/sda10 /home/bsd ufs ro,noauto,ufstype=ufs2 0 0