Linux Mint 17.1 “Rebecca” Xfce 32bit NON-PAE Kernel?

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Master One
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Linux Mint 17.1 “Rebecca” Xfce 32bit NON-PAE Kernel?

Post by Master One » Sun Mar 08, 2015 11:22 am

I have just updated the software on my good old IBM ThinkPad T42p which is running Linux Mint “Rebecca” Xfce 32bit with the NON-PAE kernel 3.13.0-24.46.

Synaptic is telling me that there is a linux-image upgrade 3.13.0-24.47 available, but I can not install it because it does not support a NON-PAE CPU.

Is this a known issue? Will there be no more NON-PAE kernel updates?

Neil Edmond
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Re: Linux Mint 17.1 “Rebecca” Xfce 32bit NON-PAE Kernel?

Post by Neil Edmond » Sun Mar 08, 2015 12:03 pm

Yes, it's a known issue. There are so few CPU in use that won't boot a PAE kernel, that it's not really a concern anymore.
There will be no more non-PAE kernels for Ubuntu and those distrobutions based on Ubuntu.

You can still install Debian with a non-PAE kernel (just did that on a T40), and maybe the same will be true for LMDE when it's ready for release. For now, best bet would be to continue using Mint 13, since it's still supported for a couple of years.

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Re: Linux Mint 17.1 “Rebecca” Xfce 32bit NON-PAE Kernel?

Post by Buzzsaw » Sun Mar 08, 2015 2:11 pm

You must have a Pentium M CPU. It actually does support PAE, but it pretends not to. You need to use the forcepae boot parameter to overcome this, then you can use a PAE 32-bit kernel.

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Re: Linux Mint 17.1 “Rebecca” Xfce 32bit NON-PAE Kernel?

Post by Master One » Sun Mar 08, 2015 2:45 pm

Yes, it's a Pentium M CPU.

This is not about getting Mint to boot, install or run on that machine, as said, I already have Rebecca up and running, it's about the current kernel upgrade from 3.13.0-24.46 to 3.13.0-24.47, which is not possible because the upgrade gets aborted with the error message that my CPU does not support PAE.

So 3.13.0-24.46 works with NON-PAE but 3.13.0-24.47 not?

There should not have been any reason to make 3.13.0-24.47 not run on NON-PAE CPUs, after all Linux Mint 17.1 “Rebecca” Xfce 32bit is supposed to still support NON-PAE CPUs.

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Re: Linux Mint 17.1 “Rebecca” Xfce 32bit NON-PAE Kernel?

Post by cmost » Sun Mar 08, 2015 4:06 pm

Why don't you just use another kernel that is non-PAE? You're not restricted to the kernels that are in the Mint repository you know. You can use any of Debian's kernels, or my personal favorite, Liquorix which is currently at 3.18. Just add the relevant repository to your /etc/apt/sources.list, run apt-get update and then open Synaptic to find the kernel of your choosing.
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Re: Linux Mint 17.1 “Rebecca” Xfce 32bit NON-PAE Kernel?

Post by AlbertP » Sun Mar 08, 2015 4:22 pm

Master One wrote:So 3.13.0-24.46 works with NON-PAE but 3.13.0-24.47 not?

There should not have been any reason to make 3.13.0-24.47 not run on NON-PAE CPUs, after all Linux Mint 17.1 “Rebecca” Xfce 32bit is supposed to still support NON-PAE CPUs.
Neither kernel supports PAE by default, both need forcepae (which is easily configured as default boot option in /etc/default/grub, by the way).

There are many Pentium M's that do support PAE, only the early or cheap models lack it. I know that the Thinkpad T40 and T41 do not support it because they use the earlier model of Pentium M called "Banias". But the T42 uses the later generation called "Dothan". Actually, apart from the widely sold T40/T41 Thinkpads, "Dothan" Pentium M's are far more common than the non-PAE "Banias" ones. All Pentium M computers which I've seen so far, except ThinkPads of model T41 and earlier, did include the PAE version of the CPU. If your computer works now with 17.1 then you have one of those Pentium M's which do support PAE.
(Your computer's specifications at http://www.thinkwiki.org/wiki/Category:T42p indicate a CPU of the "Dothan" type)
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