I have tried with numerous LiveCD ISO images, both older and current stable.
Every time it's the same error. I have 2 maximus extreme VI mb and the error is duplicated on each.
The motherboard settings are default except for PCIe set to Gen2 due to my r9 280x sapphire video card
I have tried various USB settings in the one area of the BIOS gui that references USB and nothing changes the error.
Boot to live CD, and ask for boot: , you tap the keyboard once and you see mdev load and it get's to key maps but the first thing you notice is the keyboard no longer works. That times out, and then the install dies a couple of lines later because it can no longer read the USB DVD-RW which has the iso in it.
I have successfully installed Ubuntu, Win8 and Win7 on the board with the same hardware config.
Gentoo borks at mdev.
I can't get this far. Even on the live cd
I have tried with and without legacy USB.
The board also has and HCIx hands off feature, this has no effect.
What LiveCD ISO images? Please post the URLs you used to fetch the images.
I don't recall the URL from the older image
Can you also show the lspci output for that system?
Hmmm, I don't think I ever got Ubuntu to work on this board. I ordered 2 maximus extremes and 1 Z87-PLUS. I think Ubuntu only worked on the z87-plus
Booting from Finnix, SystemRescue disk and Ubuntu right now fails in the exact same way.
Board boots up fine with windows. I am presently trying to overwrite windows but can't get that far.
lspci does not seem possible with this board.
Why every Linux fails and winblows doesn't, I have no idea.
Same issue, both extreme boards and one was just plugged in for the first time today after being RMA'ed.
From your comments, this seems to be better suited for upstream kernel. We can't enable the support for hardware that isn't supported by the kernel.
bad boards. a double whammy
I'm going to close this bug as there's nothing we can do here.
If / when the kernel gets a workaround or your board manufacturer releases a firmware updates that fixes this issue, if you try to install Gentoo again and hit any issues, please open a new bug.