When trying to install ruby 1.9.2 using rvm I got a nasty suprise:

ossl_ssl.c:110:1: error: ‘SSLv2_method’ undeclared here (not in a function)
ossl_ssl.c:111:1: error: ‘SSLv2_server_method’ undeclared here (not in a function)
ossl_ssl.c:112:1: error: ‘SSLv2_client_method’ undeclared here (not in a function)
make[1]: *** [ossl_ssl.o] Error 1
make[1]: Leaving directory `/var/cache/ruby-rvm/src/ruby-1.9.2-p180/ext/openssl'
make: *** [mkmain.sh] Error 1

The solution

sudo apt-get install ruby-rvm
# make sure we have $rvm_path
source /etc/profile
# don't use ubuntus openssl
rvm package install openssl
rvm install 1.9.2 --with-openssl-dir=$rvm_path/usr

I got myself a new toy - a Thinkpad X1. I wasn't really sure whether I should get the X1 or a Macbook Air. The main reason I decided to get the Thinkpad is because I prefer Linux for coding and I actually prefer the style of the hardware. It looks like a hackers tool and not like a shiny fashion accessory, but that's of course just my taste. It's also a lot more powerful in terms of CPU and connectivity (RJ45 jack, HDMI out, USB3, built in 3G modem). The downside is the display, the IPS displays Apple uses are just SO much better. But hey, I'm a developer not a designer.

This post describes the tweaks I did to make this notebook even better. They are also a documentation for myself. It targets advanced users.

TL;DR

Everything works out of the box, but a few tweaks make it way more awesome.

Thinkfan

The default fan settings are very aggressive and result in a lot of noise. I use thinkfan for manual fan control. This reduces the noise significantly.

#/etc/thinkfan.conf
sensor /sys/devices/platform/coretemp.0/temp1_input
sensor /sys/devices/platform/coretemp.0/temp2_input
sensor /sys/devices/platform/coretemp.0/temp3_input
sensor /sys/devices/virtual/hwmon/hwmon0/temp1_input

(0,	0,	60)
(1,	60,	70)
#(2,	76,	61)
#(3,	52,	63)
#(4,	56,	65)
#(5,	59,	66)
(7,	70,	32767)

Note that those are pretty extreme settings, use with caution and don't blame me.

Reducing power consumption

In order to improve battery life and to keep the device cool I tweaked some settings and disabled all unused devices in the bios. The changes save almost 10 watt!

#/etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.i915_enable_rc6=1"
# run update-grub after change

#/etc/rc.local
echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
for i in /sys/bus/usb/devices/*/power/autosuspend; do echo 1 > $i; done
echo min_power > /sys/class/scsi_host/host0/link_power_management_policy
echo min_power > /sys/class/scsi_host/host1/link_power_management_policy

Also you should consider using flashblock for firefox/chrome. Flash will drain your battery. If you don't believe it just look at the cpu wakeups it creates using powertop.

SSD TRIMing

I use an Intel SSD in the Notebook. The installation was a bit fiddly but the performance is just incredible. The thing boots in seconds. In order to get TRIM support I added discard to the partition options in /etc/fstab.

#/etc/fstab
UUID=b38561bd-9ca9-44a6-848d-ec90f31e1955 /               ext4    discard,errors=remount-ro 0       1

Wireless

802.11N seemed to create problems with my WLAN so I disabled it.

#/etc/modprobe.d/_wlan.conf 
options iwlagn 11n_disable=1

HDAPS

HDAPS offers you access to the accelerometer and advanced battery functions. It's simple to install:

sudo apt-get install tp-smapi-dkms
sudo modprobe -a tp_smapi hdaps
# get battery details
grep -r . /sys/devices/platform/smapi/BAT0/
# load on boot
echo "tp_smapi" >> /etc/modules
echo "hdaps" >> /etc/modules

Conclusion

With all those tweaks done the Thinkpad X1 becomes a durable, light, quiet and fast notebook with a lousy screen.

This is a little snippet I wrote to install my publickey onto multiple servers at once. The actual script I use automatically detects all the servers. It is using paramiko to do the actual ssh work.

#!/usr/bin/python
import os
from getpass import getpass

import paramiko

def deploy_key(key, server, username, password):
    client = paramiko.SSHClient()
    client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    client.connect(server, username=username, password=password)
    client.exec_command('mkdir -p ~/.ssh/')
    client.exec_command('echo "%s" > ~/.ssh/authorized_keys' % key)
    client.exec_command('chmod 644 ~/.ssh/authorized_keys')
    client.exec_command('chmod 700 ~/.ssh/')

key = open(os.path.expanduser('~/.ssh/id_rsa.pub')).read()
username = os.getlogin()
password = getpass()
hosts = ["hostname1", "hostname2", "hostname3"]
for host in hosts:
    deploy_key(key, host, username, password)