Expériences // Experiments
Raphaël Doursenaud
Raphaël Doursenaud jeu. 31 août 2017 jeu. 02 avril 2020


  • Hardware features matrix (WIP)
  • BTRFS maintenance: btrfs balance + mail results
  • Backup HDD: cron btrfs send/receive
  • Encrypt filesystems
  • Contribute DMI IDs:
|| LENOVO || 20HHCTO1WW || ThinkPad P51 || LENOVO || 20HHCTO1WW || SDK0J40697 WIN || LENOVO || None || LENOVO || N1UET72W (1.46 ) || 10/04/2018 

|| <nowiki></nowiki>
  • Report thermal alarm while running Unigine Superposition:
thinkpad_acpi: unknown possible thermal alarm or keyboard event received

thinkpad_acpi: unhandled HKEY event 0x6031

thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net

Hardware features


Device Model Specs Status Modules
CPU Intel Xeon E3-1535M v6 3.1 GHz / 4.2 GHz 4 cores / 8 threads 8 MB SmartCache Working N.A.
Imaging Unit/Gaussian Mixture Model (GMM) In CPU ? ?
ECC memory Samsung M474A2K43BB1-CRC 260pin SODIMM DDR 4 2400MHz 16 GB (× 4 - 64 GB total) Working N.A.
Screen BOE NV156FHM-N42 15.6” 16:9 1920×1080 IPS LED Working N.A.
Backlight control Working N.A.
GPU (Intel) Intel HD Graphics P630 (CPU integrated) 350 MHz / 1.10 GHz 1.7 GB DirectX 12 OpenGL 4.4 OpenCL 2.0 Working i915
GPU (nVidia) GM206GLM [Quadro M2200 Mobile] 1024 CUDA cores 4 GB GDDR5 128-bit 55W OpenGL 4.5 DirectX 12 (Hardware Feature Level 12_1) Shader Model 5.0 DisplayPort 1.2 FP32 precision Working nvidia
HDMI 1.4b Working nvhda (audio)
Mini DisplayPort 1.2a Working thunderbolt
Thunderbolt 3 / USB 3.1 Working ?
LAN Intel I219-LM 1 Gbs Working e1000e
WLAN (Wi-Fi) Intel Wireless 8265 802.11ac M.2 Working iwlwifi
WWAN Qualcomm Snapdragon X7 LTE-A (Sierra Wireless EM7455) 4G LTE-A M.2 Working cdc_mbim
GPS In WWAN device GNSS (GPS, GLONASS, Beidou, Galileo) TBD
Bluetooth Intel Wireless 8265 4.2 (Maybe software limited to 4.1?) Working btusb
Audio Intel (Realtek ALC3268 codec) Working snd_hda_intel
NVMe (M.2 SSD) Samsung NVMe SSD Controller SM961/PM961 1 TB (× 2) Working (Needs accessories)
SATA (HDD) Western Digital WDC WD10SPCX-60K 1 TB 2.5” wide 7mm high Working (Needs accessories)
Keyboard Chicony Working atkbd
Function/Multimedia keys Working N.A.
TrackPoint Chicony Working psmouse
Touchpad Synaptics Mylar surface Working psmouse
Touchscreen Wacom Capacitive multi-touch 10-fingers Working wacom
Active Pen Wacom Working wacom
Webcam SunplusIT controller? 720p (1280×720) Fixed focus Working uvcvideo
Media card MMC, SD, SDHC, SDXC UHS-II Working
Express Card Realtek RTS525A /34 Working rtsx_pci
Smartcard Reader Alcor Micro AU9540 Working
USB 3.0 Working
Power management Working thinkpad_acpi
TPM 2.0 Not Working (No TPM 2.0 toolchain on GNU/Linux just yet. See James Bottomley’s blog post) tpm
Fingerprint reader Validity Sensors, Inc. Partially Working libfprint fork (See below)
Color calibrator X-Rite Pantone Color Sensor Not Working
UEFI flash Not Working
Suspend to RAM (Standby) Working
Suspend to disk (Hibernate) Working
Battery 96 Wh Working


Display management scripts and configuration repository available on GitHub

Optimus / Prime


options nvidia_drm modeset=1


# drm.rnodes=1 Render nodes for multiple GPU and displays (PRIME)

# intel_iommu=1 Enable hardware virtualization

"Boot with standard options"  "rw root=UUID=b549d30f-939e-4d74-b39d-676856e9faca drm.rnodes=1 intel_iommu=1 quiet initrd=/intel-ucode.img initrd=/initramfs-linux.img"
Energy saving


options i915 modeset=1

options i915 semaphores=1

options i915 enable_rc6=4

options i915 enable_dc=2

options i915 enable_fbc=1
HDMI audio

Build, install and enable the nvhda module from this bug report



# Touchscreen

xinput --float Wacom\ Co.,Ltd.\ Pen\ and\ multitouch\ sensor\ Finger\ touch

xinput --float Wacom\ Co.,Ltd.\ Pen\ and\ multitouch\ sensor\ Pen\ stylus

xinput --float Wacom\ Co.,Ltd.\ Pen\ and\ multitouch\ sensor\ Pen\ eraser


# Map touchscreen and pen to laptop screen only

xinput map-to-output Wacom\ Co.,Ltd.\ Pen\ and\ multitouch\ sensor\ Finger\ touch eDP-1-1

xinput map-to-output Wacom\ Co.,Ltd.\ Pen\ and\ multitouch\ sensor\ Pen\ stylus eDP-1-1

xinput map-to-output Wacom\ Co.,Ltd.\ Pen\ and\ multitouch\ sensor\ Pen\ eraser eDP-1-1


Sound I/O not working.

Update 2018-08-28

Sound I/O is now working in Arch Linux. Don’t know which update brought support though…



options thinkpad_acpi fan_control=1



  - hwmon: /sys/devices/platform/coretemp.0/hwmon/hwmon0/temp1_input  # CPU Package

  - hwmon: /sys/devices/platform/coretemp.0/hwmon/hwmon0/temp2_input  # CPU Core 0

  - hwmon: /sys/devices/platform/coretemp.0/hwmon/hwmon0/temp3_input  # CPU Core 1

  - hwmon: /sys/devices/platform/coretemp.0/hwmon/hwmon0/temp4_input  # CPU Core 2

  - hwmon: /sys/devices/platform/coretemp.0/hwmon/hwmon0/temp5_input  # CPU Core 3

  - hwmon: /sys/devices/virtual/hwmon/hwmon2/temp1_input  # pch_skylake

  - hwmon: /sys/devices/virtual/hwmon/hwmon3/temp1_input  # acpitz (ACPI CPU)

#  - hwmon: /sys/devices/virtual/hwmon/hwmon4/temp1_input  # iwlwifi

  - nvidia: 01:00.0  # nVidia GPU

  - atasmart: /dev/sda  # HDD

    correction: [10]


  - tpacpi: /proc/acpi/ibm/fan


  - [0, 0,  40]

  - [1, 32, 55]

  - [2, 54, 66]

  - [3, 65, 76]

  - [4, 75, 80]

  - [5, 78, 85]

  - [6, 82, 88]

  - [7, 85, 32767]

Virtual hwmon path can change upon reboot and prevent thinkfan from starting. The order is determined by the modules loading order. Workaround seem to be to load modules manually in a deterministic order.

Fingerprint reader

Not supported by fprint.

Update 2020-04-02

The libfprint fork at https://github.com/nmikhailov/Validity90 offers experimental support with ongoing reverse engineering.



ESP: FAT32 1024 MiB (550 minimum Source)
BTRFS 931,51 GiB (To match the backup HDD size)
SWAP 21,36 GiB

ESP backup on second disk
Second swap

Directories and subvolumes


 +-- root subvolume (set-default) /

     +-- home directory

         +-- raph subvolume

  \-- snapshots directory

      +-- root directory

          +-- YYYY-MM-DDThh:mm:ss+02:00 (`date -Iseconds`) snapshot directory

          +-- …

      +-- raph directory

          +-- YYYY-MM-DDThh:mm:ss+02:00 (`date -Iseconds`) snapshot directory

          +-- …

Firmware bugs?

TODO: report to Lenovo support.

Workstation dock long USB detection

Using the workstation dock, boot time is painfully slow as the EFI scans USB peripherals.
Unfortunately, removing USB devices from the dock doesn’t improve performance.

Disk lock and fingerprint

When using the fingerprint scanner on boot with disk lock enabled, the first disk sometimes does not unlock.




Microsoft Windows 10

GPU compute

Linux nVidia Quadro M2200 OpenCL
Microsoft Windows 10 Intel HD Graphics P630
Microsoft Windows 10 nVidia Quadro M2200




Launched from CLI
Fullscreen window 1920x1080
5 consecutive runs

Intel modesetting




Single laptop screen


4 screens setup with Workstation Dock

screen 1 (DP-1): 4.11-4.67
screen 2 (DP-2 rotated 90° right): 4.80-5.41
screen 3 (DP-3): 4.91-5.69
screen 4 (eDP-1-1): 4.52-5.27