When using beignet (tested 1.2.1 and 1.3.0) graphical glitches appear immediately making desktop unusable, it is even enough to run clinfo CPU/GPU: i5-3470 with Intel® HD Graphics 2500 OS: Ubuntu 14.04 64 bit: Kernels: Same behavior on both 4.4 and 3.13 Some of the clinfo output: Some of clinfo output on Kernel 4.4: Platform Profile: FULL_PROFILE Platform Version: OpenCL 1.2 beignet 1.3 Platform Name: Intel Gen OCL Driver Platform Vendor: Intel ... Local memory type: Global Local memory size: 65536 ... Unified memory for Host and Device: 1 ... Name: Intel(R) HD Graphics IvyBridge GT1 Vendor: Intel Device OpenCL C version: OpenCL C 1.2 beignet 1.3 Driver version: 1.3
I can observe the same behavior on ubuntu 16.04 64bit, beignet/xenial,now 1.1.1-2 amd64 and the same processor as the OP. This happens e.g. when running `clinfo` or `gimp`, when running without opencl support, `gimp --gegl-disable-opencl`, everything works fine. searching https://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/3rd-gen-core-desktop-specification-update.pdf on page 48 you can find that this seems to be a known and unfixed bug: Specific source-copy blitter instructions in Intel® HD Graphics 2500 and 4000 processor may result in unpredictable behavior when a blit source and destination overlap.
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