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Micah Lee:
> I just installed Qubes 4.0-rc1 on a Lenovo ThinkPad T440 which runs
> Qubes 3.2 without a problem. After installing it, when I boot up, grub
> works, but then as soon as Qubes starts to boot the computer reboots,
> and I end up back in grub.

I ran into the same behavior on a T420. Removing iommu=no-igfx from
the Xen command line fixed it. [1]

If that doesn't help, _adding_ console=vga should let you see what's
going on.

Rusty


1. https://github.com/QubesOS/qubes-issues/issues/2841#issuecomment-318172669
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