Skylake Iris 540 renderer string in i965 (the same as HD 520)
benjamin.widawsky at intel.com
Thu Mar 31 20:26:58 UTC 2016
On Tue, Mar 29, 2016 at 09:00:14PM +0200, Michal Powalko wrote:
> Dear Ben and Michal,
> dear Ubuntu-bugsquad,
> I have recently bought a new Skylake based NUC with Intel® Core(TM) i5-6260U
> processor and Intel® Iris(TM) graphics 540. I am working on Ubunut 14.04.3
> LTS (kernel 4.2) and waiting for 16.04 (kernel 4.4) to take advantage of
> both CPU (from Linux kernels > 4.3) and GPU full support. The 16.04 beta 2
> is quite "unstable" in terms of Skylake GPU (see e.g. the archlinux source),
> so I tried to find out the walk-around to make it work more stable...
> I have found out Mesa commit "i965/skl: Update Skylake renderer strings"
> describing the device ID's of different GPU's. In case of my NUC, according
> the ARK' info Iris 540 has the ID of 0x1916, which in Mesa 11.x file has
> associated with HD 520 :( I did some research and found out, that the ID of
> 0x1916 can be used for HD 520 and Iris 540 (see attached screen-shots and
> links below) depending on the CPU :/
> 1. Would it be possible for You to find out the solution to assign the
> proper GPU name base on ID (Iris 540 in case of i5-6260U) - maybe
> using CPU info ?
> 2. Can the wrong name / feature assessment between HD 520 and Iris 540
> be the source of unstable operation / freeze / crash of the system
> (system working well but slow with Gallium3Ddriver)?
> I would be really happy to help You providing more information if necessary.
> * Mesa commit
> * Wiki is saying: Iris Graphics 540, *GT3e* - 48 execution units with
> 64 MB of eDRAM, up to 806.4 GFLOPS at 1.05 GHz
> * Intel graphics on linux
> * NUC specification
> * Intel Gen9 HD Graphics
> Best regards from Denmark
> Michal Powalko
Thank you for bringing this to my attention. Summing up there are two products
with the same devid, but different branding.
Let me look into this further, and I will see what we can do. Meanwhile, I would
advise filing a bug upstream on freedesktop.org.
Ben Widawsky, Intel Open Source Technology Center
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