Intel Works On Intermediate Pixel Storage
Written by Michael Larabel in Intel on 31 May 2013 at 03:48 PM EDT. 3 Comments
A new feature being worked on for the Intel DRM Linux kernel graphics driver is IPS. Short for Intermediate Pixel Storage, this feature should allow modern Intel HD graphics cores to let the CPU enter deeper PC states to increase power-savings.

Paulo Zanoni wrote in the patch series, "Intermediate Pixel Storage is a feature that should reduce the number of times the display engine wakes up memory to read pixels, so it should allow deeper PC states. IPS can only be enabled on ULT pipe A with 8:8:8 pipe pixel formats."

The difference in sleep states when using Intermediate Pixel Storage should be quite noticeable. "With eDP 1920x1080 and correct watermarks but without FBC this moves my PC7 residency from 2.5% to around 38%."

The FBC feature talked about is Frame-Buffer Compression and should also lead to letting the CPU/GPU sleep longer. Hopefully the IPS support will be primed and ready for merging with FBC into the Linux 3.11 kernel.

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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 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 automated benchmarking software. He can be followed via Twitter or contacted via

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