On Thu, Dec 01, 2016 at 02:25:05PM -0800, Matthew Macy wrote: > I imagine that for most users the state of graphics support for post-Haswell > hardware is a bit of a black box so I'm sending out this note to let users > know what they can and cannot expect. > > Wayland has actually become a reality for some. Talk to Johannes Lundberg if > you're interested in tracking that. > > The i915 (Intel integrated GPUs) driver is currently best supported by the > drm-next-4.7 branch. Broadwell and Skylake support is complete and some > support came in late in the cycle for Kaby Lake. I can still consistently > lock up the kernel in the later stages of the piglit test suite, there is no > backlight support, and suspend/resume do not work on Skylake. The drm-next > branch is integrated with upstream up through Linux 4.8-rc5 and thus has > complete support for Kaby Lake, but there is a lockup in i915 that occurs > some time within an hour of startx. This takes too long for it to have shown > up in my limited integration smoke testing. > > The amdgpu driver is, in terms of KPI dependencies - as far as I can tell - a > strict superset of the radeon driver. For example, when I tested my one older > card that uses the radeon driver it manifested the same ttm bugs as amdgpu > did at that time. Thus, when amdgpu reaches a complete working state I expect > radeon to largely "just" work. As of this past Sunday amdgpu with the amdgpu > DDX works with 2D, supports external monitors - selecting the appropriate > resolution on a per display basis, and backlight works. It will also > typically panic in ttm within ~90 minutes of startx. Although this is huge > progress over panicking within 30s of startx (which was the case as of > Saturday) or not starting at all due to bugs in the libdrm port a few weeks > prior, it's obviously not something I encourage anyone to use. > > My primary motivation for starting with the work is being able to to train > DNNs/RNNs and other model types using Theano/Caffe/Tensorflow/BidMach etc GPU > accelerated whilst still running FreeBSD. The Radeon Open Compute stack holds > out the promise of doing that without using the closed source CUDA stack on > top of the Linux ABI emulation - which would inevitably be opaque and > fragile. My plan is to keep on fixing bugs and tracking upstream until the > first long term branch after ROC support has been integrated in to Linux > mainline. I have no exact knowledge of when exactly that will be (AMD doesn't > have sufficient developer resources to make any concrete guarantees) but > think it should happen by the summer of 2017. I would like to think that by > that time the i915, amdgpu, and radeon will be feature complete and at least > as stable as the drm2 support currently in tree. > > I need to weigh my soft commitment to make long-term DRM support happen with > paid work and other activities which are much more important to me long term. > Thus I've currently committed to spending every Sunday fixing bugs in the > drm-next branches. Amdgpu is both more important to me and has gotten much > less attention than i915. Thus I will be devoting my efforts to it in the > near term. I'd very much welcome efforts by others to triage the issues in > i915. > > Many people ask when drm-next will be available on 11. I am not a committer > and thus have no direct say in that. However, if you are a motivated > individual with kernel knowledge you should contact Adrian Chadd. There are a > few places where I was not able to provide proper linuxkpi semantics without > making (mostly quite modest) changes to sys/kern. There is a general > reluctance by some core developers to make changes to accommodate Linux. It > is possible that, with additional effort, the linuxkpi can both be complete > enough to avoid needing to port the graphics drivers to FreeBSD (something > clearly shown by past efforts to be unsustainable) and not need to make any > kernel changes. If you would like to help with that, let Adrian know. In the > meantime, TrueOS will continue to use my development branches for the benefit > of users with newer hardware.
Hey Matt, Thank you so much for your hard work. It's very much appreciated. Everyone would be stuck on the VESA driver with all its crappiness if it weren't for the efforts you and your team have put in. Since I make it a point to eat my own dogfood, it has been a pleasure running a HardenedBSD-flavored version of your drm-next-4.7 bits. I'm able to run HardenedBSD on my work-issued laptop instead of CentOS. Thank you for saving me from that. Thanks, -- Shawn Webb Cofounder and Security Engineer HardenedBSD GPG Key ID: 0x6A84658F52456EEE GPG Key Fingerprint: 2ABA B6BD EF6A F486 BE89 3D9E 6A84 658F 5245 6EEE
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