Hi.
I always get a soft lockup when booting since I bought a Cape Verde XT [Radeon HD 7770/8760 / R7 250X].I have this problem with and without nomodeset and I have tested the kernels that come with Ubuntu 14.04, 14.10 and 15.04 (today's daily image).
The live session shows me the boot menu where I can enter kernel options and such, but when booting into a live session it soon prints the softlockup messages forever.
In order to install catalyst I had to disable the card in the BIOS and boot into the integrated graphics. Catalyst works perfectly.
MoBo is based on AMD 780G (Radeon HD3200 IGP).
If there's anything I can do to help find a workaround or a fix for this, let me know.
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