Lark Ultimate 7i WIN

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Hardware
PCI/USB ID
Working?
Display
Yes
#Touchscreen
Partial
Wireless
Yes
Audio
Yes
Camera (front)
No
Camera (back)
No
Bluetooth
Yes
MicroSD Reader
Yes
Accelerometer
Yes
Lark Ultimate 7i WIN
is a budget 7" tablet shipping with Windows 8, 8.1 or 10. Android versions are known to exist but were not as popular and less featured than the Windows (WIN) counterparts. There also exist 8", 10" and 11" versions of these tables and versions with 3G modem, featuring different interiors.
Lark Ultimate 7i WIN has Intel Atom Z3735G BayTrail processor with integrated graphics and 1 GB of integrated DDR3L RAM, 16 GB eMMC, 1024 x 600 pixel screen with 10-point touchscreen of unknown resolution and "Windows" button, three hardware buttons (volume up, down and power), basic accelerometer, two cameras (VGA in front, 2 Mpix in the back), microphone, mono speaker, 3.5 mm jack slot, microSD slot, miniHDMI port and one microUSB port (for data and charging). It features InsydeH20 32-bit UEFI BIOS.
Configuration
Installation
This tablet uses 32-bit UEFI despite having 64-bit processor.
For installation, you will most likely need some kind of USB hub, as you need to have keyboard and boot media connected. Booting from microSD was not tested. Wireless should work with recent Arch boot media.
Warning
Be careful not to turn off USB in BIOS, doing so will require disassembly of the device to reset CMOS to default values.
Touchscreen
For touchscreen to work, firmware is needed. For
silead
(recommended) driver, copy
mssl1680.fw
file that was extracted from Windows drivers to
/usr/lib/firmware/silead/
directory. Then,
Calibrating Touchscreen
will be needed. Until a better solution is found, this entry can be added at the bottom of
.xinitrc
file for relatively usable touchpad:
~/.xinitrc
xinput set-prop "silead_ts' --type=float "Coordinate Transformation Matrix" 4.75 0 -0.02 0 6.7 -0.02 0 0 1
See
https://github.com/onitake/gsl-firmware/tree/master/firmware/lark/ulti7iwin
and
https://github.com/onitake/gsl-firmware/blob/master/README.md
for more info.
Accelerometer
/sys/bus/i2c/devices
lists a BMA250E device. To see how it works, see
$ cd /sys/bus/i2c/devices/i2c-BMA250E\:00/iio\:device0/
$ watch cat in_accel_*_raw
Broken devices
Camera
According to
/sys/bus/i2c/devices
, there is an INT0310 device (GalaxyCore GC0310 - Front Camera) and OVTI2680 device (OmniVision OV2680 - Back Camera). Both had a short-lived driver implementation as a part of Linux kernels 4.12–4.17 staging
atomisp
driver
[1]
, which was later removed. OV2680 is implemented as a standalone driver, but it is not enabled on stock Arch kernel.
Device info
Devices on i2c bus
/sys/bus/i2c/devices
i2c-10EC5640:00
snd_soc_rt5640
Realtek RT5640 - Sound Card
i2c-BMA250E:00
bmc150_accel_*
Bosch BMC150 - Accelerometer
i2c-INT0310:00
gc0310
GalaxyCore GC0310 - Front Camera
i2c-INT33F4:00
intel_soc_pmic_i2c
Intel I2C Interface
i2c-MSSL1680:00
silead
GSL1680 - Silead touchescreen
i2c-OVTI2680:00
ov2680
OmniVision OV2680 - Back Camera