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Member Since 04 Sep 2009
Offline Last Active Jul 08 2015 07:40 PM

Posts I've Made

In Topic: Lenovo ThinkPad T420 with UEFI Only

27 June 2015 - 11:43 AM

There are some problems with BCM94322 based half mini pcie cards, but toleda provides a fix on github Maybe using these kexts/patches will fix your problem...

In Topic: Lenovo ThinkPad T420 with UEFI Only

20 June 2015 - 06:18 PM

You can run the combo update, but patched kexts in S/L/E maybe overwritten by newer versions of the Apple stock kext. So you will have to reinstall them.


When updating from 10.10.0 to 10.10.3 (and to 10.10.4beta) via AppStore there where no kexts to reinstall or something to worry about like doing some stuff before a restart.


Good luck!

In Topic: Lenovo ThinkPad T420 with UEFI Only

18 June 2015 - 08:04 PM

I don't think it's LittleSnitch-GUI. I'd guess there was some attempt to patch/modify use vga-out and/or hdmi audio out...


You should be able to safe mode (with out graphics kext/only generic graphics) by using additional boot flag "-x", so the reinstallation of the latest kext pack will it easier than doing it via terminal. Maybe deleting kext caches and repairing permissions by running kext utility could help also.

In Topic: Lenovo ThinkPad T420 with UEFI Only

16 June 2015 - 12:50 AM

@downlord I remember the painful installation of Lion on the T60p - EDID hardcoding, hex editing the radeon.kext and still some glitches left...


@tluck thanks for the welcome. You're wright it's possible to disable the iGPU in order to use constantly the nVidia (some guys at osxlatitude have done that with their DELL laptops). But the battery of the T420s is imho too small for this. At least MBP 15" model year 2011 (early and late) were able to switch automatically between AMD 6xxx and Intel HD3000 - imho this should also be possible with a nVidia gpu. 

In Topic: Lenovo ThinkPad T420 with UEFI Only

12 June 2015 - 12:32 PM

Hello jengpeng,

hardware revison v1 and v2 of TL-WN725N are using the RTL8188 chipset which will need a additional kext. I think the kext for mountain lion (10.8.x) will work. You can find it on the official Realtek site. But I'd recommend a internal card. A half mini pcie card that works oob will cost around 10-15 $ or € and you won't have to worry about unplugging while transporting the hackbook. But you will need a bios with removed whitelist (is linked in the guide), 5 minutes of time and a small philipps screwdriver for 3 screws (2 for the service latch and 1 for the wifi card itself).


@tluck, pokenguyen and all other contributors

Thanks a lot - the installation of Yosemite on my T420s worked like a charm and was completely hazzlefree done in about 30 min (including 5 min for the HD to SSD swap and switching Intel Centrino N6300 to AR9280). Last thing to fiddle out is the duels of HD3000 and NVS2000M, but that is a project for cold winter evenings ;-)

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