Random blackscreen after Apple logo?

[messenger2011]

Have you issues with this problem? Boot with -v, everything ok, no KP, then blackscreen. Connect to external monitor using DP and display go back to normal.

[jloisel]

No issue at all. happens on internal or external display?

[messenger2011]

Happened on internal display. That's bad. 99% perfetch with only one ugly issue :)

Sepcs: i5 4210M, 16gb RAM, 256gb SSD.

[jloisel]

FullHD screen or HD one? Never had this issue on 2x different t440p I installed with the config here.

[messenger2011]

FHD IPS Display. My Specs is almost same as you. Esp the CPU (i5 - i7).

Here is my dsdt dump: https://www.dropbox.com/s/659jojfsxso5jv7/origin.zip?dl=0

I'm looking at your patched DSDT and my origin, and everything seam to be fine, dont know why it keep random black screen.

[jloisel]

kexts installed in /L/E?

[messenger2011]

Yes. I'm stick to your guide. Everything works great, except random black screen.

[jloisel]

Is it with HD4600 or GT730m? Mine is HD4600 only. Check bios settings too. Otherwise, I would advise to install windows and verify the issue isn't on hardware level.

[messenger2011]

My t440p have only iGPU. I currently triple boot with Windows and Linux so no problems with hardwares at all. I end up with clean install hackintosh, may be the isssue will gone. Thank you.

[jloisel]

Let me know if this fixes the issue.

[messenger2011]

Too bad, it's not. Now I have another problem. When black screen, I try connect to external monitor via mini dp port, external monitor works well, but the internal is not, and in Settings -> Display only detect external monitor.

[jloisel]

Maybe you have a hardware fault on your unit. I installed several T440p with this configuration and none showed the issue you mentioned.

[messenger2011]

Update: Added boot flag "-igfxnohdmi igfxrst=1" fixed the issue