[Bug 76490] Hang during boot when DPM is on (R9 270X)

https://bugs.freedesktop.org/show_bug.cgi?id=76490

--- Comment #59 from m.gabrielboehme@googlemail.com --- I switched to a PowerColor R7 370 PCS+ and have the same problems as reported already. Starting with radeon.dpm=0 or nomodeset helps to boot up. I'm on Fedora 23 at the moment with a 4.2 kernel version. The quirk_list fix (in my case: { PCI_VENDOR_ID_ATI, 0x6811, 0x148c, 0x2356, <CORE_CLOCK>, <VRAM_CLOCK>} ) seems not to work, but I'll try some more values. I'll also add the vbios of my card.