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Xiaomi Mi Mix 2S (xiaomi-polaris)

From postmarketOS Wiki
Xiaomi Mi Mix 2S
File:xiaomi-polaris.jpg
Manufacturer Xiaomi
Name Mi Mix 2S
Codename xiaomi-polaris
Released 2018
Type handset
Hardware
Chipset Qualcomm Snapdragon 845 (SDM845)
CPU Octa-core (4x2.8 GHz Kryo 385 Gold
4x1.8 GHz Kryo 385 Silver)
GPU Adreno 630
Display 1080 x 2160 IPS LCD
Storage 64/128/256GB UFS2.1
Memory 6/8GB
Architecture aarch64
Software
Original software Android (MIUI)
Original version
The version the device was shipped with.
 8.0
postmarketOS
Category testing
Pre-built images
Whether pre-built images are available here.
 no
Mainline
Instead of a Linux kernel fork, it is possible to run (Close to) Mainline.
 yes
Features
Flashing
It is possible to flash the device with pmbootstrap flasher.
Works
USB Networking
After connecting the device with USB to your PC, you can connect to it via telnet (initramfs) or SSH (booted system).
Works
Battery
Charging and battery level reporting works
Partial
Screen
Display works. Ideally with sleep mode and brightness control.
Partial
Touchscreen
Partial
Multimedia
3D Acceleration
Works
Audio
Audio playback, microphone, headset and buttons.
Partial
Camera
Broken
IR TX
Untested
Connectivity
WiFi
Partial
Bluetooth
Works
GPS
Untested
NFC
Near Field Communication
Untested
Modem
Calls
Partial
SMS
Works
Mobile data
Works
Miscellaneous
FDE
Full disk encryption and unlocking with unl0kr.
Works
USB OTG
USB On-The-Go or USB-C Role switching
Broken
Sensors
Accelerometer
Auto screen rotation works in desktops e.g. Phosh or Plasma Mobile
Untested


Yet another phone based on Qualcomm Snapdragon 845 (SDM845).

How to enter flash mode

You have to press Power + Volume Down to enter the bootloader.

Installation

1. Run pmbootstrap init and select xiaomi as vendor and polaris as device.

2. Follow the onscreen instruction and configure as your needs.

Sample output: 

[10:01:49] Location of the 'work' path. Multiple chroots (native, device arch, device rootfs) will be created in there.
[10:01:49] Work path [/home/molly/.local/var/pmbootstrap]:
[10:01:49] NOTE: pmaports path: /home/molly/.local/var/pmbootstrap/cache_git/pmaports
[10:01:49] Choose the postmarketOS release channel.
[10:01:49] Available (6):
[10:01:49] * edge: Rolling release / Most devices / Occasional breakage: https://postmarketos.org/edge
[10:01:49] * v22.06: Latest release / Recommended for best stability
[10:01:49] * v21.12: Old release (unsupported)
[10:01:49] * v21.06: Old release (unsupported)
[10:01:49] * v21.03: Old release (unsupported)
[10:01:49] * v20.05: Old release (unsupported)
[10:01:49] Channel [edge]:
[10:01:51] Choose your target device vendor (either an existing one, or a new one for porting).
[10:01:51] Available vendors (70): acer, alcatel, amazon, apple, ark, arrow, asus, bq, cubietech, essential, fairphone, finepower, fly, goclever, google, gp, hisense, htc, huawei, infocus, jolla, klipad, kobo, lark, leeco, lenovo, lg, medion, meizu, microsoft, mobvoi, motorola, nextbit, nobby, nokia, nvidia, odroid, oneplus, oppo, ouya, pegatron, pine64, planet, purism, qemu, raspberry, samsung, semc, sharp, shift, sipeed, sony, sourceparts, surftab, t2m, tablet, teclast, tokio, tolino, trekstor, vernee, volla, wexler, wiko, wileyfox, xiaomi, xunlong, yu, zte, zuk
[10:01:51] Vendor [qemu]: xiaomi
[10:01:54] Available codenames (31): aries, armani, begonia, beryllium, cactus, cancro, cepheus, clover, daisy, dior, elish, equuleus, ferrari, gemini, ido, kenzo, laurel, lavender, libra, mido, natrium, platina, polaris, rolex, santoni, scorpio, tissot, vince, whyred, willow, wt88047
[10:01:54] Device codename: polaris
[10:01:56] This device has proprietary components, which trade some of your freedom with making more peripherals work.
[10:01:56] We would like to offer full functionality without hurting your freedom, but this is currently not possible for your device.
[10:01:56] device-xiaomi-polaris-nonfree-firmware: Modem, WiFi and GPU Firmware, also needed for osk-sdl
[10:01:56] Enable this package? (y/n) [y]:



$ pmbootstrap flasher flash_kernel
$ pmbootstrap flasher flash_rootfs --partition userdata

For FDE: 

$ pmbootstrap install --fde

The big list of issues

In no particular order...

Display does not work

Looking like the driver for the panel was reverted.
The commit is no longer in 6.2-rc3 after the rebase.
  • Workaround for display and touchscreen:

https://gitlab.postmarketos.org/postmarketOS/pmaports/-/issues/1894#note_1266158121

Network issues

According to my tests (@Daviteusz), it seems that WiFi works unstable and slow. I tested on a 150/30 fiber network

  • 5GHz:
    • Network crashes during apk update
    • The connection speed is about 6Mbps
    • According to speedtest, download pulls 50Mbps, but breaks connection during test
  • 2.4GHz
    • It works better, but sometimes there are similar problems
    • Connection speed = 1Mbps
    • According to speedtest download pulls max 20Mbps and test passes.

Battery charge reporting

Battery charge reporting is marked as working on the Wiki, yet /sys/class/power_supply/ is empty.
I am guessing there is something much bigger wrong here, perhaps something with the devicetree...?

Community Info

Maintainers

  • None

Old maintainers

  • MollySophia

Users owning this device


See also

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