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X1 Carbon Gen 7 how to enable legacy boot?

2019-08-14, 5:04 AM

I'm trying to enable legacy boot on my gen 7. When I first load the BIOS it has the option to switch to legacy greyed out because secure boot is enabled, but then when secure boot has been disabled it still greys out the option and says "unselectable for kernel dma protection".

 

Is there a way to get around this to enable legacy boot?

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Re: X1 Carbon Gen 7 how to enable legacy boot?

2019-08-14, 5:53 AM

I don't have an x1 carbon 7 to try, but the problem is related to a vulnerability in thunderbolt devices on all machines.  You might want to read this:

https://docs.microsoft.com/en-us/windows/security/information-protection/kernel-dma-protection-for-thunderbolt

 


Rich


I do not respond to requests for private, one-on-one help. Your questions should be posted in the appropriate forum where they may help others as well.

If a response answers your question, please mark it as the accepted solution.

I am not an employee or agent of Lenovo.
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Re: X1 Carbon Gen 7 how to enable legacy boot?

2019-08-14, 15:27 PM

 wrote:
...

Is there a way to get around this to enable legacy boot?


Curious to know why you need legacy boot.  Perhaps there's a way around that...

 

Z.


The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc.


The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored - questions and answers belong in the forum so that others may contribute and benefit. ... GeezBlog

 

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Re: X1 Carbon Gen 7 how to enable legacy boot?

2019-08-15, 12:28 PM

To enable legacy boot, you would need to disable Kernel DMA protection in the Security -> Virtualization menu.

But instead of doing this, I would recommend fixing whatever the problem is that makes you think you need legacy boot in 2019.

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04-27-2010

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Re: X1 Carbon Gen 7 how to enable legacy boot?

2019-09-04, 19:28 PM

How about answering the question instead of snark? Here are half a dozen reasons why I want to be able to boot legacy mode sometimes:

  Spinrite

  Memtest

  Advanced disk partitioning

  Image backup/restore

  Linux boot from flash (for lots of reasons)

  Lots of other tools to use in case of some problem

 

I am a security guy and I get the reason for secure boot (kinda, as if that is the main attack vector), but there are many reasons to boot from other devices. Lenovo has always made this feasible and not difficult, and now they seem to be hiding it in and making it so you have to know the secret BIOS settings justto allow me to BOOT MY OWN MACHINE HOW I WANT/NEED TO!!!

 

If you know how, please explain. If not, you are not making any useful contribution by trying to talk us out of it.

 

Thanks

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Re: X1 Carbon Gen 7 how to enable legacy boot?

2019-09-04, 19:48 PM

 wrote:

How about answering the question instead of snark?

...


So "To enable legacy boot, you would need to disable Kernel DMA protection in the Security -> Virtualization menu." didn't work for you?

 

I guess this is more snark, but perhaps apart from Spinrite (haven't looked at that in a long time) I can boot those other tools in UEFI mode.  And do regularly on my multiboot flash drives.  But, whatever floats your boat.

 

Z.


The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc.


The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored - questions and answers belong in the forum so that others may contribute and benefit. ... GeezBlog

 

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  • Message 7 of 16

Re: X1 Carbon Gen 7 how to enable legacy boot?

2019-09-04, 21:23 PM

Thanks. Yes, that seemed to work. I wish that it was a bit more obvious how to do so -- seems every BIOS version uses different settings and terminology. I agree that UEFI can be used for most things these days, but I have a few legacy tools that don't support secure boot or UEFI. Which multiboot flash generator tool do you use? I use YUMI, which has only a limited UEFI version so far.

 

Thanks again.

 

 

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  • Message 8 of 16

Re: X1 Carbon Gen 7 how to enable legacy boot?

2019-09-04, 21:40 PM

 wrote:

...

Which multiboot flash generator tool do you use? I use YUMI, which has only a limited UEFI version so far.

...

I roll my own using stand-alone grub2.  A couple of articles I wrote a while back.  The original is a bit stale and could use some updating, but I think it captures the basics.

 

A FOB STORY: some notes on bootable flash drives

 

FOB Story II

 

Z.


The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc.


The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored - questions and answers belong in the forum so that others may contribute and benefit. ... GeezBlog

 

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  • Message 9 of 16

Re: X1 Carbon Gen 7 how to enable legacy boot?

2019-09-04, 21:45 PM

Thanks!

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  • Message 10 of 16

Re:X1 Carbon Gen 7 how to enable legacy boot?

2020-08-01, 2:24 AM
i have the same problem now i have diabled the DMA protection but still the uefi/legacy boot option cannot be chaged what should i do? can u give me some advices?
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