View source for Installing Ubuntu 11.04 (Natty Narwhal) on a ThinkPad X220

[[User:Jdthood|I]] installed Ubuntu 11.04 (Natty Narwhal) on a ThinkPad {{X220}}, model 42902GW.

I have since upgraded to Ubuntu 11.10 (Oneiric Ocelot) and have updated some of the information below accordingly.

== Netboot ==
As a source of network installation files I made use of another GNU/Linux computer on my home LAN
which is connected to the Internet through a familiar ADSL-modem/gateway/router/caching nameserver/DHCP server (call it "the gateway") at address 172.19.3.1.
The gateway's DHCP server issues leases in the range 172.19.3.2 to 172.19.3.100.

First I set up the "source" machine, in my case one which already also had Ubuntu 11.04 installed.
It has address 172.19.3.7 (assigned to it by the gateway's DHCP server).
For the X220 to boot from it the machine needs to run a DHCP server and a TFTP server.
The DHCP server serves only this special purpose since, as I mentioned, the gateway is the network's main DHCP server.
The source's DHCP server must be so configured that it doesn't conflict with the existing DHCP server.

Install the <tt>isc-dhcp-server</tt> package and edit <tt>/etc/dhcp/dhcpd.conf</tt> using the following as a model.
I am not sure that every line is needed, but this worked for me.
<pre>
ddns-update-style none;
option domain-name-servers 172.19.3.1;  # This is the address of my gateway
option routers 172.19.3.1;              # This is the address of my gateway
option subnet-mask 255.255.0.0;         # This is the netmask of my home network
default-lease-time 600;
max-lease-time 7200;
allow booting;
allow bootp;

subnet 172.19.3.0 netmask 255.255.255.0 {
  range 172.19.3.220 172.19.3.229;      # This is a range separate from the one used by the gateway and includes the address below
}

group {
  next-server 172.19.3.7;               # This is the address of the "source"
  host trawsfynydd {                    # 'trawsfynydd' is the name I chose for my X220
    hardware ethernet f0:de:f1:6b:22:bf; # This is the Ethernet address of the X220
    fixed-address 172.19.3.220;         # This is an address in the range as defined above
    filename "/pxelinux.0";
  }
}
</pre>

Now install the <tt>tftpd-hpa</tt> package, download the network installation tarball and untar it into the location whence <tt>tftpd</tt> serves files.

<pre>
$ cd /tmp
$ wget http://archive.ubuntu.com/ubuntu/dists/natty/main/installer-amd64/current/images/netboot/netboot.tar.gz
$ cd /var/lib/tftpboot
$ sudo tar zxf /tmp/netboot.tar.gz
</pre>

Second set up the X220 for PXE (Pre-boot eXecution Environment).
* Switch on the X220 and press F1.  ThinkPad Setup starts.
* Set Config | Network | Ethernet LAN Option ROM to "Enabled".
* Select Startup | Boot; select "PCI LAN IBA GE Slot..." and use the [+] key to move it to the top of the boot priority order
* Press F10 to save and exit.

Voilà, the X220 boots the Ubuntu installer.

== Installation ==

I won't describe the Ubuntu installer.
I'll just mention some little problems I had.

''First'', when it came time to resize the existing (ntfs) partition the partitioner asked what size I would like for "this partition".  Did it mean the to-be-resized ntfs partition or the new ext4 partition?  

Turns out it meant: the to-be-resized ntfs partition, so the suggested "max" selection was the opposite of what I wanted.

''Second'', when I selected (only) the "Ubuntu desktop" task the installation reported failure without explaining what had gone wrong.

I de-selected all tasks and the installation succeeded.

''Third'', after reboot the screen came up black.

I pressed CTRL-ALT-F1 to get the system console so I could log in.

After logging in I ran <tt>tasksel</tt> and installed "Ubuntu desktop" and this time no failure was reported.

== Information ==

=== BIOS ===

Originally:
<pre>
BIOS Version: 8DET46WW (1.16)
</pre>
From Windows 7 I ran Lenovo ThinkVantage Tools to upgrade the BIOS.  Now:
<pre>
BIOS Version: 8DET51WW (1.21)
</pre>

=== {{dmidecode}} ===
<pre>
# dmidecode -s system-manufacturer
LENOVO
# dmidecode -s system-product-name
42902WG
# dmidecode -s system-version
ThinkPad X220
</pre>

=== /proc/cpuinfo ===
<pre>
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 42
model name	: Intel(R) Core(TM) i5-2540M CPU @ 2.60GHz
stepping	: 7
cpu MHz		: 800.000
cache size	: 3072 KB
physical id	: 0
siblings	: 4
core id		: 0
cpu cores	: 2
apicid		: 0
initial apicid	: 0
fpu		: yes
fpu_exception	: yes
cpuid level	: 13
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 x2apic popcnt aes xsave avx lahf_lm ida arat epb xsaveopt pln pts dts tpr_shadow vnmi flexpriority ept vpid
bogomips	: 5182.27
clflush size	: 64
cache_alignment	: 64
address sizes	: 36 bits physical, 48 bits virtual
power management:
</pre>

=== lspci ===
<pre>
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series Chipset Family MEI Controller #1 (rev 04)
00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04)
00:1a.0 USB Controller: Intel Corporation 6 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 6 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 1 (rev b4)
00:1c.1 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 2 (rev b4)
00:1c.3 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 4 (rev b4)
00:1c.4 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 5 (rev b4)
00:1d.0 USB Controller: Intel Corporation 6 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation 6 Series Chipset Family LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 6 Series Chipset Family 6 port SATA AHCI Controller (rev 04)
00:1f.3 SMBus: Intel Corporation 6 Series Chipset Family SMBus Controller (rev 04)
03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205 (rev 34)
0d:00.0 System peripheral: Ricoh Co Ltd Device e823 (rev 04)
</pre>

=== lsusb ===
<pre>
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 006: ID 04f2:b217 Chicony Electronics Co., Ltd 
Bus 001 Device 005: ID 0a5c:217f Broadcom Corp. Bluetooth Controller
Bus 001 Device 004: ID 147e:2016 Upek Biometric Touchchip/Touchstrip Fingerprint Sensor
Bus 001 Device 003: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
</pre>

=== Key table ===
This table was prepared ''before'' keys were remapped as discussed elsewhere on this page.

References:
* [https://wiki.ubuntu.com/Hotkeys Hotkey architecture in Ubuntu]
* [https://wiki.ubuntu.com/Hotkeys/Troubleshooting Hotkey troubleshooting instructions]
* <tt>/usr/include/linux/input.h</tt> -- list of Linux key codes
* [[Default meanings of special keys]]

{| border="1" cellspacing="0" cellpadding="2"
! Key combination !! Extra function symbol !! ACPI event<br>(<tt>acpi_listen</tt>) !! Scan code<br>(<tt>showkey&nbsp;-s</tt>)<br><i>(hex)</i> !! Linux key code<br>(<tt>showkey&nbsp;-k</tt>) !! Input event<br>(<tt>input-events</tt>) !! ... on input device(*) !! X KeyCode<br>(<tt>xev</tt>) !! Keyboard Shortcuts name
|-
| {{key|&#x1F4E2;&#x20E5;}} (loudspeaker icon with stroke) || || (none) || down: e0 20<br>up: e0 a0 || 113 || KEY_MIN_INTERESTING (0x71) || 3 || 121 || XF86AudioMute
|-
| {{key|−&#x1F4E2;}} (minus sign, loudspeaker icon) || || (none) || down: e0 2e<br>up: e0 ae || 114 || KEY_VOLUMEDOWN (0x72) || 3 ||122 || XF86AudioLowerVolume
|-
| {{key|&#x1F4E2;+}} (loudspeaker icon, plus sign)  || || (none) || down: e0 30<br>up: e0 b0 || 115 || KEY_VOLUMEUP (0x73) || 3 || 123 || XF86AudioRaiseVolume
|-
| {{key|&#x1F3A4;&#x20E5;}} (microphone icon with stroke)  || || ibm/hotkey HKEY 00000080 0000101b || (none) || 240 (rop) || KEY_UNKNOWN (0xf0) || 6 || 248 || "∅" (sic)
|-
| {{ibmkey|ThinkVantage|#495988}}                   || || ibm/hotkey HKEY 00000080 00001018 || down: e0 1f e0 9f || 148 (rop) || KEY_PROG1 (0x94) || 6 || 156 || XF86Launch1
|-
| {{ibmkey|Fn|#494949}}                             || || (none) || up: e0 63 e0 e3 || 143 || KEY_WAKEUP (0x8f) || 3 || 151 || XF86WakeUp
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|F1|#494949}}       || || ibm/hotkey HKEY 00000080 00001001 || (none) || 466 (rop) || KEY_FN_F1 (0x1d2) || 6 || (none) || (none)
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|F2|#494949}}       || &#x1F512; (padlock symbol) || ibm/hotkey HKEY 00000080 00001002 || down: e0 12 e0 92 || 152 (rop) || KEY_SCREENLOCK (0x98) || 6 || 160 || XF86ScreenSaver
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|F3|#494949}}       || &#x1F50B; (battery symbol) || ibm/hotkey HKEY 00000080 00001003 || down: e0 71 e0 f1 || 236 (rop) || KEY_BATTERY (0xec) || 6 || 244 || XF86Battery
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|F4|#494949}}       || ☾ || ibm/hotkey HKEY 00000080 00001004 || down: e0 5f e0 df<br>(but sometimes nothing) || 142 (rop) || KEY_SLEEP (0x8e) || 6 || 150 || XF86Sleep
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|F5|#494949}}       || &#x2E28;&#x1F4BB;&#x2E29; (radiating computer symbol) || ibm/hotkey HKEY 00000080 00001005 || down: e0 73 e0 f3 || 238 (rop) || KEY_WLAN (0xee) || 6 || 246 || XF86WLAN
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|F6|#494949}}       || (camera, headset) || ibm/hotkey HKEY 00000080 00001006 || down: e0 3b e0 bb || 212 (rop) || KEY_CAMERA (0xd4) || 6 || 220 || XF86WebCam
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|F7|#494949}}       || &#x1F4BB;&#x239A; (computer symbol, screen symbol) || ibm/hotkey HKEY 00000080 00001007 || down: e0 56 e0 d6 || 227 (rop) || KEY_SWITCHVIDEOMODE (0xe3) || 6 || 235 || XF86Display
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|F8|#494949}}       || (trackpoint symbol, vertical bar, trackpad symbol) || ibm/hotkey HKEY 00000080 00001008 || down: e0 74 e0 f4 || 191 (rop) || KEY_F21 (0xbf) || 6 || 199 || XF86TouchpadToggle
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|F9|#494949}}       || || ibm/hotkey HKEY 00000080 00001009 || down: 6f ef || 194 (rop) || KEY_F24 (0xc2) || 6 || 202 || "Ê" (sic)
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|F10|#494949}}      || || (none) || (none) || || (none) || || (none) || (none)
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|F11|#494949}}      || || ibm/hotkey HKEY 00000080 0000100b || (none) || 476 (rop) || KEY_FN_F11 (0x1dc) || 6 || (none) || (none)
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|F12|#494949}}      || &#x1F4BB;&nbsp;&#x25B6;&#x274D; (computer symbol, right arrowhead, diskpack symbol) || ibm/hotkey HKEY 00000080 0000100c || down: e0 25 e0 a5<br>(but sometimes nothing) || 205 (rop) || KEY_SUSPEND (0xcd) || 6 || 213 || XF86Suspend
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|Home|#494949}}     || ☀▴ || ibm/hotkey HKEY 00000080 00001010 and video LCD0 00000086 00000000 || down: e0 54 e0 d4 e0 54 e0 d4 || 225 (double) (rop) || KEY_BRIGHTNESSUP (0xe1) || 4, 6 || 233 || XF86MonBrightnessUp
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|End|#494949}}      || ☀▾ || ibm/hotkey HKEY 00000080 00001011 and  video LCD0 00000087 00000000 || down: e0 4c e0 cc e0 4c e0 cc || 224 (double) (rop) || KEY_BRIGHTNESSDOWN (0xe0) || 4, 6 || 232 || XF86MonBrightnessDown
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|PgUp|#494949}}     || (illuminating overhead lamp symbol) || (none) || (none) || (none) || (none) || (none) || (none) || (none)
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|Space|#494949}}    || [&#x1F50D;+] (screen with magnifying glass symbol and plus sign, i.e., "zoom" symbol) || ibm/hotkey HKEY 00000080 00001014 || (none) || 372 (rop) || KEY_ZOOM (0x174) || 6 || (none) || (none)
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|→|#494949}}        || &#x23ED; (barred right arrowhead, i.e., "next" symbol) || (none) || down: e0 19<br>up: e0 99 || 163 || KEY_NEXTSONG (0xa3) || 3 || 171 || XF86AudioNext
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|↓|#494949}}        || &#x23EF; (right arrowhead, double bar, i.e., "play/pause" symbol) || (none) || down: e0 22<br>up: e0 a2 || 164 || KEY_PLAYPAUSE (0xa4) || 3 || 172 || XF86AudioPlay
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|←|#494949}}        || &#x23EE; (barred left arrowhead, i.e., "prev" symbol) || (none) || down: e0 10<br>up: e0 90 || 165 || KEY_PREVIOUSSONG (0xa5) || 3 || 173 || XF86AudioPrev
|-
| {{ibmkey|Fn|#494949}}-{{ibmkey|↑|#494949}}        || ∎ ("stop play" symbol) || (none) || down: e0 24<br>up: e0 a4 || 166 || KEY_STOPCD (0xa6) || 3 || 174 || XF86AudioStop
|-
| {{ibmkey|◂ ⎗|#494949}} (left arrowhead, page icon) || || (none) || down: e0 6a<br>up: e0 ea || 158 || KEY_BACK (0x9e) || 3 || 166 || XF86Back
|-
| {{ibmkey|⎘ ▸|#494949}} (page icon, right arrowhead) || || (none) || down: e0 69<br>up: e0 e9 || 159 || KEY_FORWARD (0x9f) || 3 || 167 || XF86Forward
|}

In the Linux key code column, "rop" means "release on press", i.e., the release event is generated at the same time as the press event.

The button on the UltraBase doesn't seem to generate any events visible to userspace.

Input device numbers and types as reported by <tt>lsinput</tt>:
{| border="1" cellspacing="0" cellpadding="2"
|+ (*) /dev/input/event<i>n</i>
! n !! name
|-
| 0 || "Lid Switch"
|-
| 1 || "Sleep Button"
|-
| 2 || "Power Button"
|-
| 3 || "AT Translated Set @ keyboard"
|-
| 4 || "Video Bus"
|-
| 5 || "Integrated Camera"
|-
| 6 || "ThinkPad Extra Buttons"
|-
| 7 || "SynPS/2 Synaptics TouchPad"
|-
| 8 || "TPPS/2 IBM TrackPoint"
|}

Hotkey mask when the above table was compiled:
<pre>
$ cat /sys/devices/platform/thinkpad_acpi/hotkey_mask
0x078dffff
$ cat /sys/devices/platform/thinkpad_acpi/hotkey_all_mask
0x07ffffff
$ cat /sys/devices/platform/thinkpad_acpi/hotkey_recommended_mask
0x078dffff
$ cat /sys/devices/platform/thinkpad_acpi/hotkey_report_mode
1
</pre>

== Configuration and solved problems ==

=== Fingerprint reader ===
See [[How to enable integrated fingerprint reader with fprint|how to enable the integrated fingerprint reader with fprint]].

=== Fix for [https://bugs.freedesktop.org/show_bug.cgi?id=11227 hotkey shortcomings] ===
(Updated November 2011 for Oneiric.)

By default the "zoom" (Fn-Space) and "microphone-mute" (button next to the ThinkVantage button) hotkeys do nothing.

'''Zoom''': The <tt>thinkpad-acpi</tt> module, kernel and <tt>udev</tt> map the zoom key's ACPI event (<tt>ibm/hotkey HKEY 00000080 00001014</tt>) to input event <tt>KEY_ZOOM</tt> whose numerical value, 372, is greater than 255, the highest key-event code that X can handle.

'''Micmute''': The <tt>thinkpad-acpi</tt> module and kernel generate an ACPI event (<tt>ibm/hotkey HKEY 00000080 0000101b</tt>) for the microphone mute button but in releases earlier than precise this is not mapped to anything; in precise it is mapped to 256 which is also greater than 255, the highest that X can handle. Bug reported [https://bugs.launchpad.net/ubuntu/+source/udev/+bug/408903 here].

The fault lies with X which can't handle key codes above 255.  But as discussed, e.g., [https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/313514 here], it may be a long time before this gets fixed in X.

There is a fairly easy workaround.
Install version 175 or later of the <tt>udev</tt> package and do the following.
<pre>
# sudo su
# mkdir /etc/udev/keymaps
# cp /lib/udev/keymaps/module-lenovo /etc/udev/keymaps
</pre>
Now edit <tt>/etc/udev/keymaps/module-lenovo</tt> so that 0x13 and 0x1A get mapped to <tt>search</tt> and <tt>prog2</tt>, respectively (instead of <tt>zoom</tt> and <tt>micmute</tt>, respectively).

Then in System Settings | Keyboard | Shortcuts assign a behavior to the <tt>XF86Search</tt> event, the X event corresponding to <tt>search</tt>. This behavior will be invoked by Fn-Space.

There is no built-in function for muting the microphone but it is straightforward to concoct one using <tt>amixer</tt>.
In Keyboard | Shortcuts select Custom Shortcuts and press <tt>+</tt> to create a new shortcut named "Microphone mute" whose command-content is the following.
<pre>
sh -c "if amixer get Capture,0 | grep -q '\[on\]' ; then amixer -q set Capture,0 nocap ; else amixer -q set Capture,0 cap; fi"
</pre>
Assign this to <tt>XF86Launch2</tt> which is the X event corresponding to input event <tt>prog2</tt>. This behavior will be invoked by the microphone-mute key.

[Added June 2013:] This will [https://bugs.launchpad.net/ubuntu/+source/udev/+bug/408903 supposedly] be fixed for Ubuntu 13.10 (Saucy). The microphone-mute ACPI event will be mapped to f20 instead of prog2 but making use of this will require patches to other packages: https://code.launchpad.net/~jm-leddy/

=== Fix for [https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/486154 the known no-system-beep problem] ===
As I described in more detail [[Installing Ubuntu 9.10 (Karmic Koala) on a ThinkPad X61#Partially solved problem: No beep|earlier]]:
* Create <tt>.xprofile</tt> containing
<pre>
pactl upload-sample /usr/share/sounds/gnome/default/alerts/glass.ogg bell.ogg
</pre>
* Run <tt>gconf-editor</tt> and at <tt>desktop | gnome | peripherals | keyboard</tt> change the value of <tt>bell_mode</tt> from <tt>off</tt> to <tt>on</tt>.
* If the default bell volume of 50 (percent) is not loud enough, add a line like the following to <tt>~/.bashrc</tt>.
<pre>
xset b 100
</pre>
* To cause terminal bells to ring also in non-X terminals (e.g., the console terminal), comment out the <tt>blacklist pcspkr</tt> line in <tt>/etc/modprobe.d/blacklist.conf</tt>.

=== Fix for "[drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle..." problem ===
To fix [https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/761065 this known problem] upgrade the kernel: install the <tt>linux-image-2.6.38-11-generic</tt> package and reboot.

=== [[Tp smapi|tp-smapi]] loading ===
First, it is as usual necessary to add
<pre>
tp-smapi
</pre>
to <tt>/etc/modules</tt> so that <tt>modoprobe</tt> will attempt to load the module at boot time.

=== <tt>hdaps</tt> ===
Having loaded <tt>hdaps</tt> do:
<pre>
sudo add-apt-repository ppa:linrunner/thinkpad-extras
sudo apt-get update
sudo apt-get install hdaps-utils
hdaps-gl
</pre>

Result:

[[Image:ThinkPad_X220_running_hdaps-gl.jpg|Tilted ThinkPad X220 running hdaps-gl|300px]]

=== Miscellaneous configuration ===
* Having installed bare Ubuntu I had to run <tt>tasksel</tt> and select at least "Ubuntu Desktop".

* In order to allow NetworkManager to manage eth0 I had to comment out the "eth0" stanza in <tt>/etc/network/interfaces</tt>

* I used System Settings | Ubuntu Software Center to install <tt>ccsm</tt> ("Advanced Desktop Effects Settings") so I could enable Wobbly Windows and so I can initiate window resize with Alt+Button3 which is easier than the default Alt-Button2 (i.e., Alt-scrollwheelbutton).

* Add PPAs to apt sources list for additional indicators

=== Unity automaximizes ===
To disable this (annoying) behavior, run <tt>gconf-editor</tt> and set <tt>apps|compiz-1|plugins|grid|screen0|options|top_edge_action</tt> to 0 (originally 10).

== Ex-problems ==
=== Suspend causes kernel panic ===
"Suspend-to-RAM and brightness control of the display work with kernel >= 3.0-rc6" according to [[Installing Gentoo on a ThinkPad X220|this fellow]].

Since I upgraded to kernel 2.6.38-11-generic I haven't had any kernel panics on suspend.

=== TPM can't be used ===
To try it out, install <tt>tpm-tools</tt>.  

When I first tried it, the <tt>tpm_version</tt> program failed with "Communication failure".

But now it prints this:
<pre>
  TPM 1.2 Version Info:
  Chip Version:        1.2.8.32
  Spec Level:          2
  Errata Revision:     3
  TPM Vendor ID:       STM 
  TPM Version:         01010000
  Manufacturer Info:   53544d20
</pre>

Presumably the new kernel fixed this.

=== memtest86+ didn't work ===

Upgrading to the oneiric version, v4.20, fixed this.

=== Multiple monitors ===
Configuring an extended desktop over two monitors led to malfunction.  Side-by-side worked, one above the other did not.

In natty the solution was just to avoid the layouts that caused the malfunction.

The problems appear to have been completely solved in Ubuntu 11.10 (Oneiric Ocelot).

=== Bluetooth-related crashes ===
Switching bluetooth on or off either using the indicator or Fn-F5 sometimes crashed the machine.

I haven't seen this problem in Ubuntu 10.10 (Oneiric Ocelot).

=== [[Tp smapi|tp-smapi]] loading problem ===
The distributed <tt>tp-smapi</tt> and <tt>hdaps</tt> modules didn't load on my X220
and <tt>thinkpad-acpi</tt> reported the EC firmware number as "unknown".

The BIOS setup program reports this information about the BIOS:
* Model 42902WG
* UEFI BIOS 8DET46WW (1.16) 2011-05-18
* Embedded Controller 8DHT23WW (1.07)

This problem was fixed in <tt>tp-smapi</tt> version 0.41-1.  As of 7 August 2011 <tt>tp-smapi-dkms</tt> is available in Debian unstable (Ubuntu uses Debian <tt>tp-smapi</tt> packages with no changes) and this is the version in Ubuntu 11.10 (Oneiric Ocelot).

Output from <tt>dmesg</tt> after <tt>modprobe</tt>ing <tt>thinkpad-ec</tt>, <tt>tp-smapi</tt> and <tt>hdaps</tt>:
<pre>
[  714.842090] thinkpad_ec: thinkpad_ec 0.41 loaded.
[  721.983409] tp_smapi 0.41 loading...
[  721.984742] tp_smapi successfully loaded (smapi_port=0xb2).
[  729.462533] hdaps: LENOVO ThinkPad X220 detected, setting orientation 4
[  729.462894] hdaps: initial mode latch is 0x05
[  729.463022] hdaps: setting ec_rate=250, filter_order=2
[  729.463242] hdaps: device successfully initialized.
[  729.463799] input: ThinkPad HDAPS joystick emulation as /devices/virtual/input/input15
[  729.464101] input: ThinkPad HDAPS accelerometer data as /devices/virtual/input/input16
[  729.464342] hdaps: driver successfully loaded.
</pre>

Modinfo:
<pre>
$ modinfo tp-smapi
filename:       /lib/modules/2.6.38-11-generic/updates/dkms/tp_smapi.ko
license:        GPL
version:        0.41
description:    ThinkPad SMAPI Support
author:         Shem Multinymous
srcversion:     B6841670771B2FF5222BFFD
depends:        thinkpad_ec
vermagic:       2.6.38-11-generic SMP mod_unload modversions 
parm:           debug:Debug level (0=off, 1=on) (int)
</pre>

== Remaining problems ==

=== Indicator lamp on microphone mute key doesn't work ===
The problem has been discussed, e.g., [https://bugs.launchpad.net/ubuntu/+source/linux/+bug/408903 here].

== Comparison with [[Installing Ubuntu 10.10 (Maverick Meerkat) on a ThinkPad X220|a Ubuntu 10.10 user's experience]] ==
* (improvements)
** I didn't have to do anything special to have the <tt>thinkpad-acpi</tt> module loaded or use special keys
** The mute-microphone button can be made to work as described above
** Both left and right microphones are seen
** I have no difficulties with the fans
** I have no difficulties with SD cards
** The "Hangcheck timer elapsed" problem has been fixed in a new kernel version, as described above

== Things to remember ==
To get Google Earth to work you have to do
<pre>
sudo apt-get install libgl1-mesa-glx:i386
</pre>

[[Category:Ubuntu 11.04]][[Category:Ubuntu 11.10]]