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Linux Hybrid Graphics Will Be A Mess For A While

Hardware

Published on 31 October 2011 01:57 PM EDT
Written by Michael Larabel in Hardware
15 Comments

Most of you know this already, but: hybrid graphics, the technology concept of having dual GPUs (generally a low-power IGP and a high-performance discrete GPU) and being able to seamlessly switch between them depending upon load and battery life, is a mess under Linux. It will continue to be a mess for the near-term.

The matter of Linux hybrid graphics support was brought up today during one of the morning sessions at the Ubuntu Developer Summit in Orlando. Simply put, there isn't much Canonical will be doing in the near-term to better support this technology (then again they aren't a company known for their upstream engineering work), but they do hold out hope for the longer-term that there will be improvements.

For Ubuntu 12.04 LTS they are looking at potentially offering support for Ironhide, which allows for hybrid graphics on NVIDIA Optimus systems in "a somewhat seamless user experience", but hasn't undergone thorough review and some Optimus laptops may not even work with this community-spawned creation. The open-source Ironhide implementation allows the NVIDIA binary driver to be used, but it's performance still isn't as optimal as running a native X Server on the hardware. NVIDIA Optimus is a MUX-less configuration, but for notebooks that are MUX-ed they are looking at maybe adding some logic so the user can choose which GPU they wish to have associated with the screen.

Supporting the MUX-ed configurations is a mess due to needing to restart the X Server, dealing with some drivers not liking each other, X.Org limitations, etc. It's all long-term work that's being done upstream to hopefully improve the situation someday and while the X11 Server is still dominant.

Recently there was some work done by David Airlie in the first phase of GPU hot-plugging, which eventually may benefit such Optimus / multi-GPU configurations, but it will be a significant number of months before everything is ready to be merged -- that is assuming the work ever even gets completed.

So in the next six months for Ubuntu 12.04 LTS there isn't expectations for much to change aside from possibly making the Ironhide project easier to use in Ubuntu, but longer-term the Ubuntu developers will wait and see what gets done.

The notes from the hybrid graphics support strategy planning session at the UDS-P Orlando summit can be found via this Ubuntu.com page.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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