I have a new HD7970, and after awhile the GPU device disappears from the OpenCL device list. Here's what clinfo says when that happens:
Number of platforms: 1 Platform Profile: FULL_PROFILE Platform Version: OpenCL 1.2 AMD-APP (923.1) Platform Name: AMD Accelerated Parallel Proces sing Platform Vendor: Advanced Micro Devices, Inc. Platform Extensions: cl_khr_icd cl_amd_event_callbac k cl_amd_offline_devices cl_khr_d3d10_sharing Platform Name: AMD Accelerated Parallel Proces sing Number of devices: 1 Device Type: CL_DEVICE_TYPE_CPU Device ID: 4098 Board name: Max compute units: 4 Max work items dimensions: 3 Max work items: 1024 Max work items: 1024 Max work items: 1024 Max work group size: 1024 Preferred vector width char: 16 Preferred vector width short: 8 Preferred vector width int: 4 Preferred vector width long: 2 Preferred vector width float: 4 Preferred vector width double: 0 Native vector width char: 16 Native vector width short: 8 Native vector width int: 4 Native vector width long: 2 Native vector width float: 4 Native vector width double: 0 Max clock frequency: 3010Mhz Address bits: 64 Max memory allocation: 2147483648 Image support: Yes Max number of images read arguments: 128 Max number of images write arguments: 8 Max image 2D width: 8192 Max image 2D height: 8192 Max image 3D width: 2048 Max image 3D height: 2048 Max image 3D depth: 2048 Max samplers within kernel: 16 Max size of kernel argument: 4096 Alignment (bits) of base address: 1024 Minimum alignment (bytes) for any datatype: 128 Single precision floating point capability Denorms: Yes Quiet NaNs: Yes Round to nearest even: Yes Round to zero: Yes Round to +ve and infinity: Yes IEEE754-2008 fused multiply-add: Yes Cache type: Read/Write Cache line size: 64 Cache size: 65536 Global memory size: 8581414912 Constant buffer size: 65536 Max number of constant args: 8 Local memory type: Global Local memory size: 32768 Kernel Preferred work group size multiple: 1 Error correction support: 0 Unified memory for Host and Device: 1 Profiling timer resolution: 340 Device endianess: Little Available: Yes Compiler available: Yes Execution capabilities: Execute OpenCL kernels: Yes Execute native function: Yes Queue properties: Out-of-Order: No Profiling : Yes Platform ID: 000007FED9012A08 Name: AMD Phenom(tm) II X4 940 Proces sor Vendor: AuthenticAMD Device OpenCL C version: OpenCL C 1.2 Driver version: 2.0 (sse2) Profile: FULL_PROFILE Version: OpenCL 1.2 AMD-APP (923.1) Extensions: cl_khr_fp64 cl_amd_fp64 cl_khr_ global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int3 2_base_atomics cl_khr_local_int32_extended_atomics cl_khr_int64_base_atomics cl_ khr_int64_extended_atomics cl_khr_byte_addressable_store cl_khr_gl_sharing cl_ex t_device_fission cl_amd_device_attribute_query cl_amd_vec3 cl_amd_printf cl_amd_ media_ops cl_amd_popcnt cl_khr_d3d10_sharing
It doesn't do this upon a fresh reboot. It's only after some amount of time that at some point, the GPU is just gone.
Also (maybe related?) the machine now sometimes doesn't let me wake it back up after it has turned off the monitors. I have found that with the new Radeon drivers for the new card that I have to disable the "turn off monitors" in the Power settings for the computer to keep working when I leave it alone for a few hours.
Any idea what's going on?