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Lenovo ThinkPad T420 with UEFI Only

* * * * * 10 votes UEFI ThinkPad T420 Lenovo Clover

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#1181
wetzel

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@Adrenalation a "protective MBR" is what gdisk calls a GPT partition table, that's what it's supposed to say!

 

In the Windows installer, are you able to access the custom option and change/delete/create partitions?



#1182
Adrenalation

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@tluck. Yup it's MBR instead of PMBR. Anyway to format this to PMBR without reinstalling OS X?

 

@wetzel Yes, I have the ability to access that menu. I then try formatting my ~100GB windows partition, but still the same error, saying it is MBR.

 

I think tluck has it right saying that disk utility gave me an MBR instead of PMBR.

 

Screen_Shot_2014_07_11_at_9_32_21_AM.png



#1183
wetzel

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@ Adrenelation, try this; in Disk Utility, delete the FAT partition you created (by going to the whole disk->partition and click the minus with the FAT partition selected), then run a Repair Disk on the entire disk. That should recreate the PMBR.

 

Then, try installing Windows again, it should allow you to create a new partition in the free space.

 

Shows my ignorance here // lack of apple documentation. I messed around with this in my apple VM and noticed that creating a FAT partition automatically converts the PMBR to MBR (but then deleting it as I instruct and running Repair Disk rebuilds it...) Oh, Apple.

 

Edit: BE CAREFUL with the Windows installer, make sure you choose custom and then create a partition in the empty space, otherwise it'll nuke your OSX installation.



#1184
Adrenalation

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@wetzel. Well, I just ended up using gdisk from terminal. Selected disk0 as my disk, went to experts menu via X, and wrote a new PMBR via N. Wrote changes and all was well. :) Oh.....apple.

 

Screen_Shot_2014_07_11_at_9_40_03_AM.png

 

Still having issues with the sound......though. Not urgent, but buggy. Maybe my headphone detection switch has gone bad? ha.



#1185
wetzel

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Awesome, I love gdisk. I am glad to know that Disk Utility is an insidious little devil now. (I hate it when software does things without telling me)



#1186
Adrenalation

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@wetzel.

 

One last thing in regards to Windows Installation. Any idea how to ensure that Microsoft installs boot data into the EFI ESP partition where Clover resides, instead of the MSR (Microsoft Reserved Partition) that Windows creates?



#1187
RehabMan

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@wetzel.
 
One last thing in regards to Windows Installation. Any idea how to ensure that Microsoft installs boot data into the EFI ESP partition where Clover resides, instead of the MSR (Microsoft Reserved Partition) that Windows creates?


The MSR partition is not used for Windows boot files.

#1188
wetzel

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@tluck it'll use the ESP either way actually, the MSR is literally used for nothing, except some really weird Windows corner cases that no one ever bumps into.



#1189
Adrenalation

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@wetzel Great. Now win7 is installed, but it skips past the Clover UEFI boot menu in the ESP and boots automatically in Windows. Windows boot files are now in /EFI/Microsoft........ Any ideas?

 

I had to use the Clover OS X USB to boot into my hard drive



#1190
tluck

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@adrenalation - replace /EFI/BOOT/bootx64.efi with a copy of Cloverx64.efi

 

boot OSX (w usb for now) then

i.e. some thing like this:

cp /Volumes/EFI/EFI/CLOVER/CLOVERX64.efi /Volumes/EFI/EFI/BOOT/BOOTX64.efi


#1191
wetzel

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tluck's right as usual!

 

If you get multiple Windows entries in Clover after you do that, you might have to tweak your Clover config a bit, but you're almost there!



#1192
Adrenalation

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Thanks guys for sticking with me. I'm learning something new every day. ;) Dual boot is working as it should.

 

Still a couple things I'd like to fix.

 

  • 1600x900 Resolution is not working in Clover Boot Menu; any Fixes?
  • Headphone jack on laptop still does not work. (tried unplugging and plugging many times) (Probably the detecting pin is Broken) Time for a new jack! (Disregard Possible Conflicts with DSDT)

 

@Nvidia NVS 4200M Users. Has anyone fiddled with DSDT Patching?







Also tagged with one or more of these keywords: UEFI, ThinkPad, T420, Lenovo, Clover


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