Many Intel Bay Trail Devices Have Been Borked On Linux For The Past Year
Written by Michael Larabel in Intel on 10 March 2016 at 07:59 AM EST. 34 Comments
INTEL --
To many users, Intel's codename of Bay Trail for the recent Atom SoCs would be more accurate if it was named Bay Fail.

While my Bay Trail Linux experiences had been positive, a Phoronix reader wrote in this morning to tell me about some widespread Bay Trail Linux kernel troubles that have been happening for the past year and also impact Braswell. Kernels newer than Linux 3.16 are able to cause random X session freezes. This issue has occurred on many different notebooks, tablets, desktops, and other Bay Trail devices. The particular user that wrote in reportedly has 16 systems affected by this issue.


This FreeDesktop.org bug report was initially opened in January of 2015 about "full system freezes" and the original poster bisected it down to a bad commit within the i915 ValleyView code. There was more than 100 comments to this bug report without much action by Intel's Linux graphics developers when finally in December they realized it might not be a bug in the Intel i915 DRM driver but rather a behavior change in the GPU driver that made a CPU cstates issue more pressing. The known workaround that came up in the year of bug reports is that booting a modern Linux kernel with intel_idle.max_cstate=1 will fix the system freezes. However, using that option will also cause your system's power use to go up due to reduced power efficiency of the CPU.

In December when shifting the blame to the other part of the kernel, this Kernel.org bug report was opened and in the few months since has received more than 120 comments of the same issue occurring on many different Bay Trail systems.


As of right now and even with the many complaints about this bug on a multitude of systems and Linux 4.5 set to be released this weekend, this bug hasn't been properly resolved yet.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 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 OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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