The Core i7 5775C Is Still Running Into Issues On Linux

Written by Michael Larabel in Intel on 13 July 2015 at 04:18 PM EDT. 8 Comments
It's been over a week now playing with the Intel Core i7 5775C on Linux and unfortunately problems persist even after buying another Intel Z97 motherboard.

I wrote earlier this month about kernel panics when trying to test the i7-5775C Broadwell H socketed processor on Linux. I ended up finding a workaround to improve the stability and that was by enabling the "CPU OC Fixed Mode" from the UEFI/BIOS on this particular Z97 motherboard, after my original Z97 test motherboard wouldn't even boot up with the i7-5775C when equipped with the latest, Broadwell-supporting BIOS. Since then I bought a third motherboard to see how the situation plays out.

The new motherboard I've been testing is the MSI Z97-G45 GAMING, a $130 Z97 chipset motherboard. In early June is when MSI released the BIOS v2.7 for this motherboard that claims 5th Generation Intel Core Processor (Broadwell) support. With this new motherboard I first upgraded to this BIOS with a Devil's Canyon CPU before trying out the i7 5775C.

With this MSI Z97 motherboard, it was more stable than the previous ASRock motherboard and I didn't have to toggle the CPU OC Fixed Mode or any other setting from the UEFI setup area... However, occasionally I am still running into kernel panics attributed to the Intel_Idle driver. Even with Linux 4.2 Git, problems remain.

The MSI Z97-G45 GAMING with the Core i7 5775C is a lot better than the other motherboards tested in terms of out-of-the-box support, but the kernel panic occasionally while under load is a bit worrisome. I hope to have at least some preliminary benchmark results out later this week. Stay tuned for more Broadwell Linux testing on Phoronix.
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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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