2015-01-11 14:19 GMT-03:00 Alex Deucher <alexdeucher@xxxxxxxxx>:
Booting with nomodeset disables the graphics drivers so if you are
still getting problems, it may a hardware problem. Can you attach
your full dmesg and lspci output? Are you disabling the onboard
graphics when enabling the external dGPU?
Alex
I attached those outputs to https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973
I wasn't sure if you meant attaching to this response.I was able to boot with nomodeset into Ubuntu 15.04's image. I get to a graphic log in screen, but I also get some errors in the kernel log
[drm:radeon_init] *ERROR* No UMS support in radeon module!
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