How do I isolate a bug between trusty and utopic?

Asked by caleb h. on 2014-06-25

I'm trying to narrow down a regression on Ubuntu wherein suspend causes a kernel panic, but I don't know how to narrow the regression down between Trusty and Utopic kernel releases. This is on a Samsung Ativ Book 9 2014, i.e. model np940x5j-k02us.

Based on the builds here:;O=A

I've narrowed it to between Trusty kernel 3.14.8 and kernel 3.15.0 (v3.14.8-utopic versus v3.15-rc1-trusty).

I was trying to isolate this further, maybe bisect, and based on this document:

tried searching `git tag`, but tags stop at -9.29:

Since I'm using a mainline kernel, I've opened a bug ticket on Bugzilla (, but would still like to understand how to bisect between the different Ubuntu release branches.

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If you are using the Mainline Kernal PPA then you should contact the PPA maintainer. The Utopic kernel in the official Ubuntu release is separate from that PPA and it is considered 3rd party.

If you have simply installed the kernel from that PPA on Trusty, and nothing else then you have not upgraded to Utopic as Utopic uses lots of newer (and unstable) packages for everything in the OS
 Not just the kernel

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