SOLVED Unity System Compositor crashes (failed to get hwcomposer service)

hacker1024

Hi everyone, I've been trying to port Ubuntu Touch to my Xiaomi Redmi K20 Pro (raphael), using Halium 9 with the help of the GSI.

I'm almost there - but LightDM crashes, because unity-system-compositor crashes.
Below is the contents of /var/log/lightdm/unity-system-compositor.log:

[2020-07-21 03:22:44.018348] <information> mirserver: Starting
[2020-07-21 03:22:44.019006] < - debug - > mirserver: Using Linux VT subsystem for session management
[2020-07-21 03:22:44.019123] <information> mircommon: Loading modules from: /usr/lib/arm-linux-gnueabihf/mir/server-platform
[2020-07-21 03:22:44.019168] <information> mircommon: Loading module: /usr/lib/arm-linux-gnueabihf/mir/server-platform/graphics-android-caf.so.15
[2020-07-21 03:22:44.019180] <information> mircommon: Loading module: /usr/lib/arm-linux-gnueabihf/mir/server-platform/graphics-android.so.15
[2020-07-21 03:22:44.019188] <information> mircommon: Loading module: /usr/lib/arm-linux-gnueabihf/mir/server-platform/input-evdev.so.7
[2020-07-21 03:22:44.036631] <information> mirserver: Found graphics driver: mir:android-caf (version 1.8.0) Support priority: 0
[2020-07-21 03:22:44.036800] <information> mirserver: Found graphics driver: mir:android (version 1.1.0) Support priority: 256
[2020-07-21 03:22:44.036953] <information> mirserver: Selected driver: mir:android (version 1.1.0)
[2020-07-21 03:22:44.063923] <information> android/server: Error opening HWC HAL. Assuming HWComposer 2 device with libhwc2_compat_layer.
failed to get hwcomposer service

Does anyone know what's happening here?

My device tree
My kernel fork

hacker1024

Fixed - turns out I need the binder patch: https://github.com/moto-SDM660/android_kernel_motorola_sdm660/commit/d6d8b51485eaf02933055e2d201c338bca1020f6

AppLee

@hacker1024 Great you could figure it out.

Can you mark the thread as solved (Topic Tools -> Ask a question then -> mark as solved) so people could find the answer easily.

Thanks.