I'm experiencing this issue on my mom's computer, a Gateway system with an AMD A6-5400K APU (Radeon HD 7540D graphics). The behavior Jaap Woldringh describes is exactly what I'm seeing. I boot an Ubuntu 16.04 liveDVD and I get the black screen. If I reboot from the liveDVD and specify "nomodeset", the system boots but in low resolution. When I look at the Xorg.0.log file, I see the "No UMS support in radeon module" message.
What's interesting is I booted the same liveDVD on another system, an HP with an AMD A8-5500k APU (Radeon HD 7560D graphics) and it booted just fine, no issues at all. My mom's Gateway system is currently running Ubuntu 14.04.2 without any issues and at full resolution. Of course, I would like to get this resolved before I attempt to upgrade her system to 16.04.1. :) Thanks! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1568211 Title: Unable to boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1568211/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
