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Member Since 02 Oct 2006
Offline Last Active Oct 24 2016 09:40 PM

Posts I've Made

In Topic: Lenovo ThinkPad T420 with UEFI Only

20 October 2016 - 08:10 PM

if you usr dsdt to enable discrete graphics,,no need nvda_drv=1 and webdrive...i set  Bios to Discrete only

Thanks xtdd, how did you enable discrete graphics in dsdt? Can you share your dsdt/sdt and config.plist?


Nothing I tried so far has worked ...

In Topic: Lenovo ThinkPad T420 with UEFI Only

19 October 2016 - 09:31 PM

Hi @la0011, to get this work I only needed to change smbios to 10.1, I also disabled intel injection and enabled Nvidia injection in clover. After that all booted nicely, then I installed also NVIDIA alternative web drivers for Sierra (don't take the older driver for Sierra not the latest as that latest drivers don'w work).


Thanks jus12, I'll try disabling Intel injection, I don't think I tried that yet. SMBIOS is set to 10.1 as well.


But still, maybe you can share some more information. Did you set Bios to Discrete only or to Optimus? What DSDT are you using? Are you using the kexts provided here for the T420? Intel Backlight kext for example?


Maybe you can share your DSDT and config.plist?


I tried Nvidia Web drivers, but after restart I can't even open the Cconrol panel. Might be a seperate problem though. Which driver version is it you are using?

In Topic: Lenovo ThinkPad T420 with UEFI Only

18 October 2016 - 08:42 AM

Hi jus12,


if I get your posts right, you have Sierra running with Nvidia and built-in display. Do you think you can share your settings (DSDT, config.plist, bios settings, EDID, display overrides, kext used)?


I'm running a W520 myself and only get a black screen when booting with discrete only. 



In Topic: W520 Black Screen when using MBP8,x SMBIOS

04 April 2016 - 08:53 AM



You didn't get the black screen when using ACPIBacklight.kext? Interesting ...


I get that slider as well, probably because I patched PNLF in DSDT. And just like in your case, it doesn't do anything.


Remains to be solved I guess.

In Topic: W520 Black Screen when using MBP8,x SMBIOS

31 March 2016 - 04:34 PM

I got what you meant, just in my case it doesn't work properly without NVCAP. Probably due to different cards.


Searched for brightness control in El Capitan, but didn't find much.


This could be a starting point, maybe it's all about finding a proper DSDT patch ...



On a side note, just leaving Inject Intel on in Clover works as well. Then by switching to Optimus in Bios, you get the whole thing working with HD3000. No need to change anything in  Clover.


When I don't need the Quadro, this can come in handy.



Ahhh, sorry for the bad link. Will try to find something else ...

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