The Linux 4.2 Mainline Kernel From Ubuntu Is Finally Working Again

Written by Michael Larabel in Ubuntu on 18 July 2015 at 08:52 AM EDT. Add A Comment
After the Linux Git kernel built by the Ubuntu Mainline Kernel PPA failed to work for the past two weeks, the kernel should now be bootable again.

Since even before 4.2-rc1 was released, the kernel wasn't bootable on many systems in our test lab at Phoronix and

After the issue persisted for more than two weeks, I made some kernel automation improvements to Phoromatic and the Phoronix Test Suite to figure out the root cause of the issue. I wrote about what in Ubuntu's kernel configuration was messing up so many systems.

One day after making those details public, there was a Launchpad bug report about this issue, and now it seems resolved as the kernels in the past day or two are working again... The fix, as the workaround mentioned in the article earlier this week, was to disable CONFIG_OF for x86-64 kernels.

My daily kernel test systems are now back to chugging along. You'll then be able to catch up with all of the daily Linux kernel Git benchmarks over on
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Michael Larabel

Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

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