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+======= Thinkpad T440p =======
+The Thinkpad T440p is a classic business laptop made by Lenovo starting in 2013.
+It's the latest and fastest Thinkpad model (Intel Haswell) where coreboot boot firmware can be used and Intel ME can be neutralized. Later laptops have signed firmware where this has become impossible. **The T440p is a strong recommendation** if you need the latest IME-cleaned, coreboot laptop available.
+====== General information ======
+===== T440p graphics =====
+The T440p is available in two different tastes:
+  * Intel HD 4600 (20 shader units, 22 nm, DirectX 11.1), i915
+  * Intel HD 4600 + NVIDIA GeForce 730M (Optimus)
+==== Intel HD 4600 Graphics ====
+The graphic card used is integrated in the CPU. In this case the heat sink with part number 00HM902 is used. Its performance is the best among all Thinkpad laptops and even okay for occasional gaming (depending on the game, resolution and quality settings).
+==== Intel HD 4600 Graphics + NVidia GT730M ====
+Using Nvidia Optimus, graphic card being used is dynamically switching from HD4600 to Nvidia GT730M depending on the load. Heatsink part number 00HM903 is used.
+The Nvidia GT730M has not been tested at Vikings. This has been an odd choice from Lenovo, since it will perform very similar or even worse than the integrated GPU. We simply disregard it and use the integrated CPU.
+===== T440p recommended upgrades =====
+There are a number of possible/recommended upgrades which are mentioned further below.
+==== Displays ====
+The following displays are recommended to replace TN panels that came from the factory which have sub-par viewing angles, color accuracy and resolutions.
+^Make       ^Model                         ^Type^Size^Coat ^Color^Resp.^Cont.^View Angle^Bright.  ^Power^
+|AUO        |B140HAN01.1 (AUO113D)         |IPS |FHD |Matte|16.2M|25ms |700:1|89        |300 cd/m²|5.4W |
+|AUO        |B140HAN01.2 (AUO123D)         |IPS |FHD |Matte|16.2M|25ms |700:1|89        |300 cd/m²|5.4W |
+|AUO        |B140HAN01.3 (AUO133D)         |IPS |FHD |Matte|16.2M|25ms |700:1|89        |300 cd/m²|5.4W |
+|AUO        |B140HAN01.4                   |IPS |FHD |Matte|16.2M|25ms |700:1|89        |200 cd/m²|NA   |
+|LG         |LP140WF3-SPD1 (LGD046D)       |IPS |FHD |Matte|262K |25ms |700:1|80        |300 cd/m²|4.6W |
+|Innolux    |N140HCE-EN1 C2 or C4 (CMN14D2)|IPS |FHD |Matte|262K |25ms |700:1|89        |300 cd/m²|3.98W|
+|**Innolux**|**N140HCG-GQ2**               |IPS |FHD |Matte|16.7M|14ms |800:1|89        |400 cd/m²|3.1W |
+=== N140HCG-GQ2 IPS display recommended ===
+While all displays from the list above have been tested and found to be working well, **the most recommended display is the N140HCG-GQ2**. It has superior brightness and image quality and uses the least power of all available options. It was published relatively recently (2019) and can therefore be considered modern. At Vikings we **love** this display <del>and that's why we use for our customers that order the IPS panel option</del> (sold out as of Oct 2024, beware of fakes on ebay, aliexpress etc.)
+== Panel brackets ==
+These panels usually don't come with brackets so they cannot be installed in the T440p as is because there are no mounting points. It's possible to either re-use brackets from old T440p TN panels. Re-using old brackets from TN panels require some modifications so the N140HCG-GQ2 will fit and will likely result in permanent damage to the donor panel. It's also possible to use custom made brackets (this is what we do when you order a T440p with an IPS display)
+When purchased at Vikings, we take care of any modifications required.
+==== Synaptics trackpad recommended ====
+T440p laptops come with trackpads that are, in our opinion, unusable for productive work.
+Synaptics touchpads are available from the #vikings shop. This replaces the T440p's original touchpad and significantly improves the T440p's usability.
+===== CPUs and CPU considerations =====
+There is a number of good CPU models available that will be best for your use-case.
+==== Most balanced: Intel Core i7-4712MQ ====
+  * TDP: 37 W
+  * Total Cores: 4
+  * Total Threads: 8
+  * Processor Base Frequency: 2.30 GHz
+  * Max Turbo Frequency: 3.30 GHz
+  * Cache: 6 MB
+  * VT-x: Yes
+  * VT-d: No
+  * Graphics Max Dynamic Frequency: 1.15 GHz
+==== Economic choice: Intel Core i7-4600M ====
+Higher base frequencies, same TDP, 2 MB less cache and half of the cores & threads of the i7-4712MQ. Supports VT-d.
+  * TDP: 37 W
+  * Total Cores: 2
+  * Total Threads: 4
+  * Processor Base Frequency: 2.90 GHz
+  * Max Turbo Frequency: 3.60 GHz
+  * Cache: 4 MB
+  * VT-x: Yes
+  * VT-d: Yes
+  * Graphics Max Dynamic Frequency: 1.3 GHz
+==== To do: Intel Core i7-4800MQ ====
+===== RAM =====
+GB RAM Kit:  Crucial RAM CT2KIT102464BF160B 16GB Kit (2x8GB) DDR3 1600 MHz CL11
+Or: Samsung M471B5273CH0-YK0 / Samsung 8GB 1RX8 PC3L-12800S DDR3 1600 MHz 1,35 V SODIMM
+According to [[https://octoperf.com/blog/2018/11/07/thinkpad-t440p-buyers-guide/#ram]] this is one of the fastest available options: //G.Skill F3-2133C11D-16GRSL//
+These modules seem to be very hard to find.
+===== CPU Benchmarks =====
+==== Timed Linux Kernel Compilation 6.1 ====
+pts/build-linux-kernel-1.15.0 [Build: defconfig]
+Intel Core i7-4940MX: 388 (note: stock HSF)
+===== Notes on fan control and acpi =====
+The kernel module thinkpad_acpi is unable to autodetect a T440p that runs coreboot instead of the vendor BIOS. The module needs to be forced to load. Add a .conf file to /etc/modprobe.d/ containing:
+  options thinkpad_acpi force_load=1
+In order to use a software fan control mechanism, hwmon and lm-sensors needs to be used (/proc/acpi/ibm/thermal won't work on the T440p).
+Install lm-sensors
+run sensors-detect with root privileges (answering each question with the default (just hit ENTER) should work)
+Check /sys/devices/platform/coretemp.0/hwmon/hwmonX/ for the temperatures you want to use (check the temp*_label to identify the sensor and temp*_input to get the temperature)
+Add hwmon /sys/devices/platform/coretemp.0/hwmon/hwmonX/temp*_input to the thinkfan.conf just above the level settings
+======= EC firmware ======
+===== EC firmware release notes and changelog =====
+Is [[https://download.lenovo.com/pccbbs/mobiles/gluj43us.txt|available here]] (link to the most current GLUJ43US firmware package), [[https://web.archive.org/web/20230325121925/https://download.lenovo.com/pccbbs/mobiles/gluj43us.txt|archive.org link]].
+===== Last modifiable EC-firmware is package 2.53 (GLUJ41US) =====
+The last modifiable version is firmware package 2.53: BIOS 2.53 (GLET99WW), EC 1.12 (GLHT29WW)
+===== EC firmware downgrades not possible after firmware package 2.53 =====
+As the result of CVE-2019-6171, newer Lenovo firmware update files have added a digital signature. If you upgrade to the locked versions you will not be able to patch and/or modify your EC without downgrading it. This **is relevant** if you're using any future EC hacks or want to work on the EC firmware yourself. This is **not relevant** if you don't plan to flash unsigned EC firmware in the future.
+Basically, any BIOS update package where the changelog mentions CVE-2019-6171 will have this lockdown. Lenovo provides more information about the **[[https://support.lenovo.com/us/en/solutions/len-27764|Embedded Controller Update Vulnerability]]** [[https://web.archive.org/web/20220521000601/https://support.lenovo.com/us/en/solutions/len-27764|(archive.org link]]).
+===== If the BIOS is at any of the locked versions and you would like to downgrade =====
+  * Ensure that downgrading is possible in BIOS settings (Security/UEFI BIOS Update Option/Secure Rollback Prevention -> Disable)
+  * Downgrade it to the version before the one addressing CVE-2019-6171. EC firmware will be automatically downgraded as well
+===== Download firmware packages from the Lenovo website =====
+BIOS and EC firmware can be downloaded from the Lenovo website at https://pcsupport.lenovo.com/us/de/products/laptops-and-netbooks/thinkpad-t-series-laptops/thinkpad-t440p/downloads/ds037575
+===== Lenovo whitelisting adapters (not an issue with coreboot) =====
+Avoid newer firmware packages, the newer the firmware versions the more limitations on what hardware you can use with it (Lenovo whitelists) will be imposed on you, so some WLAN adapters won't work for example. This is only relevant if you're not using coreboot.
+====== Third-party batteries ======
+There does not seem to be a battery vendor lock-in on the T440p, even with the newest Lenovo firwmare (at the time of writing this is "GLUJ43US"). There are some 3rd party batteries that won't charge for unknown reasons. However, [[https://shop.vikings.net/product-category/accessories/t440p-parts-accessories/|batteries sold at Vikings]] have been tested thoroughly and work as expected.
+====== GNU/Linux related information ======
+===== Powersave considerations / using TLP =====
+TLP is currently one of the best powersaving utilities available for GNU/Linux operating systems. It performs many functions of similar tools (e.g. the popular powertop), without having the user worry about performing them manually.
+==== Install TLP using your Linux distibution's package manager ====
+For Debian:
+''%%sudo apt install tlp tlp-rdw%%''
+==== Modifying tlp for better battery life ====
+The default configuration should be fine for most people, however we will be modifying it for better battery life.
+''%%$ sudo editor /etc/tlp.conf%%''
+Change the content to this and then save the changes:
+''%%CPU_BOOST_ON_AC=1%%''\\
+''%%CPU_BOOST_ON_BAT=0%%''
+Apply these changes by running:
+''%%$ sudo systemctl status tlp.service %%''
+If successful, enable tlp for the next reboots:
+''%%$ sudo systemctl enable tlp.service%%''
+====== See also ======
+https://thinkwiki.de/T440p
+https://seiba.gitlab.io/thinkpad-t440p-upgrade-guide/
+https://blog.0xcb.dev/lenovo-t440p-coreboot/