Hi. I always get a soft lockup when booting since I bought a Cape Verde XT [Radeon HD 7770/8760 / R7 250X].
In this bug report you can find screenshots of the softlockup and the kernel panic generated by using softlockup_panic=1 https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973 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. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/dri-devel/attachments/20150110/03c8f4c7/attachment.html>