Hi I was driven here by Ubuntu team : https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1746357 Only nomodeset and radeon.dpm=0 allow boot. Issue is here from kernel 3.13 to 4.15.1
Does booting with radeon.bapm=0 or radeon.bapm=1 on the kernel command line in grub help?
No, neither radeon.bapm=O nor radeon.bapm=1 help neither in K4.4.0-112 nor K4.15.1
Chiming in to say I've had the same issue for an extremely frustratingly long time. I haven't been able to run anything newer than 14.04 on this machine until today. I can confirm that the radeon.dpm setting doesn't seem to matter, it's nomodeset that lets me boot. I've got the same motherboard, an MSI A88XM-345 on the latest (hah, 2014, E7721AMS V25.6) BIOS, and an A8-6600K APU.
radeon.dpm=0 was the only workaround for me (or nomodeset)
And my MoBo is not the same : A88XM-E35
That's my bad, my hardware is more different than I thought AND I spelled it wrong, it's an A88XM-E45. I'll have to check again later tonight if radeon.dpm=0 worked on its own, I'm having a hard time remembering now. How embarrassing.
Hi Some problem after 4.15 update. Radeon HD 5770 Evergreen kernel 4.15.2-2-ARCH disable dpm is a workaround
After triple checking, nomodeset or radeon.dpm=0 prevents boot loops on my hardware.
Badly written in OP : you must read "Only nomodeset OR radeon.dpm=0 prevent bootloop" (i.e. no need to use both altogether).
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