Xiaomi Mi Mix 2S (xiaomi-polaris)

From postmarketOS Wiki
Xiaomi Mi Mix 2S
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 8.0
postmarketOS
Category testing
Pre-built images no
Mainline yes
Features
Flashing
Works
USB Networking
Works
Internal storage
SD card
Battery
Partial
Screen
Partial
Touchscreen
Partial
Multimedia
3D Acceleration
Works
Audio
Partial
Camera
Broken
Camera Flash
IR TX
Connectivity
WiFi
Partial
Bluetooth
Works
GPS
NFC
Modem
Calls
Partial
SMS
Works
Mobile data
Works
Miscellaneous
FDE
Works
USB OTG
Broken
HDMI/DP
Sensors
Accelerometer
Magnetometer
Ambient Light
Proximity
Hall Effect
Haptics
Barometer


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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