[HELP] HDMI lags & glitches on UHD 620

[spurdo88]

Hi there! Installed 10.14.4 on Lenovo Thinkpad L380 Yoga. Everything seems to be work ok, got several issues:
1) Power off reboots device. May caused by extra boot flags, worked before on 10.13. Will try to resolve it by myself.
2) Main problem - I had problems with HDMI - system becomes laggy & glitched even if i have patched framebuffer.
I had tried to add -lilucpu=8 - it helped a bit & reduce freezes, but unfortunately sometimes i got freezes for example, Bluetooth mouse freezes for a few seconds.
Now i have added AAPL,GfxYTile Data 01000000 to device\properties. System becomes more stable, but unfortunately i notify lags sometimes.
I have no problems if i use internal laptop's display. This freezes happen only on connected hdmi.

Any ideas? Also will be glad for some corrections for my config. Thank you!

For anyone who have same laptop & would like to install OSX on it i would be glad to share my repo:
macOS on Lenovo ThinkPad L380 Yoga

 

[spurdo88]

All right, fixed it by myself.
Great thanks to @Sniki and his guide for laptop with same config. I'm talking about this guide.
What did i change:
1) Migrated from FakeSMC to VirtualSMC.
2) Removed SSDT-XCPM.aml, because it causes HDMI blinks after device wake from sleep.
3) Removed -lilucpu=8. It was a hack and i think that freezes was caused by it. I feel absolutely different after removing it. System becomes more stable & smooth.

Detected problems with USB, wrong mapping, will resolve it at weekends.
Thanks to all. Hope my experience will help. Attaching debug files.

 

[spurdo88]

Update:glitches was caused by Bluetooth adapter, replaced it with usb dongle, glitches disappeared, but fixes above caused display blinking every 3-7 minutes. No idea how to fix it.