[AMD] Unable to Display on 16.04 Xenial Beta

[Michael Murphy]

Having an issue with a system here that has both an AMD Radeon HD 6850 and an AMD A8-7600 APU that is unable to get a display from either when attempting to boot into GDM, and subsequently when attempting to boot into GNOME from lightdm. The display will simply hang and be unable to switch to a TTY.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gdm3 3.18.2-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-13.29-generic 4.4.5
Uname: Linux 4.4.0-13-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Mar 16 21:44:19 2016
InstallationDate: Installed on 2016-03-16 (0 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160304)
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)

[劝儒 (quanruzhuoxiu)]

I had suffered yesterday.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.