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Pixel Experience with Android 12 For Mi Mix 2S (Polaris)

New build available for Xiaomi Mi Mix 2s (polaris)
by Chenyang Zhong

  • Version: 12
  • Build date: January 21, 2022
  • File size: 1.61 GB


  • January security patch
  • Added support for quick tap (for compatible devices)
  • Added support for hardware keys customization (for compatible devices)
  • Added support for unlimited backup on Google Photos (with original quality)
  • Translations imported
  • Lot of bug fixes

Device Changelog:

  • Etude kernel: Op.12 No.2
    • Linux 4.9.297 and CAF tag LA.UM.9.8.r1-04400-SDM710.0
    • built with the latest Clang 14 and ThinLTO
    • backported optimizations on qrwlock from mainline kernel
    • backported optimized spinning loop in osq lock
    • reduced cache line size back to 64KB to avoid occasional network packet allocation performance issue
    • dropped unnecessary ndelay in kernel timers because we have queued spinlock
    • DO NOT use another kernel. Just don’t.
  • Enabled Quick Tap
    • you can trigger certain actions by double tapping the back of the phone
    • enable it in Settings/System/Gestures/Quick tap
  • Switched to Skia Vulkan as HWUI renderer
    • the GL renderer has memory allocation/deallocation issues that sometimes crash apps like Twitter when you scroll through lots of images and videos. This is also happening on stock Pixel 6
    • Vulkan does not seem to have this issue for now, and it has much less jitter. Some apps like Spotify may still not be fully smooth in certain scrolls, due to a combination of app implementation and AOSP android 12 issues
  • Went back to audio HAL v5 to match our prebuilt audio HAL
  • Fixed a bug in the recovery override process
    • PE recovery is supposed to overwrite your current recovery if no change is made to the boot partition
    • this is the same stock behaviour on MIUI. You can avoid it by making any changes to the boot partition, like flashing Magisk
  • Updated DPM, IMS, and RIL system blobs from LA.QSSI.12.0.r1-05100-qssi.0
    • missing ringback tone (the one after a call is connected and before the other side picks it up) in some carriers should be fixed
  • Switched to CAF’s latest IMS RCS implementation
  • Telephoto lens should be selectable in certain gcam ports
  • tested on BSG’s 8.1 gcam; BSG’s 8.3 does not use the aux camera yet, as the time of writing


  • Clean Flash Recommended.




  • All testers and developers.


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