Hi,

not sure this is the right place to send this to: I'm having trouble 
with OpenCL and my new GPU (darktable 1.6.6, GeForce GT 730, Ubuntu 
15.04). What shall I do? Thanks a lot!

darktable -d opencl
[opencl_init] opencl related configuration options:
[opencl_init]
[opencl_init] opencl: 1
[opencl_init] opencl_library: ''
[opencl_init] opencl_memory_requirement: 768
[opencl_init] opencl_memory_headroom: 300
[opencl_init] opencl_device_priority: '*/!0,*/*/*'
[opencl_init] opencl_size_roundup: 16
[opencl_init] opencl_async_pixelpipe: 0
[opencl_init] opencl_synch_cache: 0
[opencl_init] opencl_number_event_handles: 25
[opencl_init] opencl_micro_nap: 1000
[opencl_init] opencl_use_pinned_memory: 0
[opencl_init] opencl_use_cpu_devices: 0
[opencl_init] opencl_avoid_atomics: 0
[opencl_init] opencl_omit_whitebalance: 0
[opencl_init]
[opencl_init] found opencl runtime library 'libOpenCL'
[opencl_init] opencl library 'libOpenCL' found on your system and loaded
[opencl_init] found 1 platform
[opencl_init] found 1 device
[opencl_init] device 0 `GeForce GT 730' has sm_20 support.
[opencl_init] device 0 `GeForce GT 730' supports image sizes of 32768 x 
32768
[opencl_init] device 0 `GeForce GT 730' allows GPU memory allocations of 
up to 511MB
[opencl_init] device 0: GeForce GT 730
      GLOBAL_MEM_SIZE:          2048MB
      MAX_WORK_GROUP_SIZE:      1024
      MAX_WORK_ITEM_DIMENSIONS: 3
      MAX_WORK_ITEM_SIZES:      [ 1024 1024 64 ]
      DRIVER_VERSION:           346.72
      DEVICE_VERSION:           OpenCL 1.1 CUDA
[opencl_init] compiling program `demosaic_ppg.cl' ..
[opencl_load_program] loaded cached binary program from file 
`/home/jo/.cache/darktable/cached_kernels_for_GeForceGT730/demosaic_ppg.cl.bin'
[opencl_load_program] successfully loaded program from 
`/usr/share/darktable/kernels/demosaic_ppg.cl'
[opencl_build_program] successfully built program
[opencl_build_program] BUILD STATUS: 0
BUILD LOG:


[opencl_init] compiling program `atrous.cl' ..
[opencl_load_program] loaded cached binary program from file 
`/home/jo/.cache/darktable/cached_kernels_for_GeForceGT730/atrous.cl.bin'
[opencl_load_program] successfully loaded program from 
`/usr/share/darktable/kernels/atrous.cl'
[opencl_build_program] successfully built program
[opencl_build_program] BUILD STATUS: 0
BUILD LOG:


[opencl_init] compiling program `basic.cl' ..
[opencl_load_program] loaded cached binary program from file 
`/home/jo/.cache/darktable/cached_kernels_for_GeForceGT730/basic.cl.bin'
[opencl_load_program] successfully loaded program from 
`/usr/share/darktable/kernels/basic.cl'
[opencl_build_program] successfully built program
[opencl_build_program] BUILD STATUS: 0
BUILD LOG:


[opencl_init] compiling program `blendop.cl' ..
[opencl_load_program] loaded cached binary program from file 
`/home/jo/.cache/darktable/cached_kernels_for_GeForceGT730/blendop.cl.bin'
[opencl_load_program] successfully loaded program from 
`/usr/share/darktable/kernels/blendop.cl'
[opencl_build_program] successfully built program
[opencl_build_program] BUILD STATUS: 0
BUILD LOG:


[opencl_init] compiling program `highpass.cl' ..
[opencl_load_program] loaded cached binary program from file 
`/home/jo/.cache/darktable/cached_kernels_for_GeForceGT730/highpass.cl.bin'
[opencl_load_program] successfully loaded program from 
`/usr/share/darktable/kernels/highpass.cl'
[opencl_build_program] successfully built program
[opencl_build_program] BUILD STATUS: 0
BUILD LOG:


[opencl_init] compiling program `nlmeans.cl' ..
[opencl_load_program] loaded cached binary program from file 
`/home/jo/.cache/darktable/cached_kernels_for_GeForceGT730/nlmeans.cl.bin'
[opencl_load_program] successfully loaded program from 
`/usr/share/darktable/kernels/nlmeans.cl'
[opencl_build_program] successfully built program
[opencl_build_program] BUILD STATUS: 0
BUILD LOG:


[opencl_init] compiling program `gaussian.cl' ..
[opencl_load_program] loaded cached binary program from file 
`/home/jo/.cache/darktable/cached_kernels_for_GeForceGT730/gaussian.cl.bin'
[opencl_load_program] successfully loaded program from 
`/usr/share/darktable/kernels/gaussian.cl'
[opencl_build_program] successfully built program
[opencl_build_program] BUILD STATUS: 0
BUILD LOG:


[opencl_init] compiling program `sharpen.cl' ..
[opencl_load_program] loaded cached binary program from file 
`/home/jo/.cache/darktable/cached_kernels_for_GeForceGT730/sharpen.cl.bin'
[opencl_load_program] successfully loaded program from 
`/usr/share/darktable/kernels/sharpen.cl'
[opencl_build_program] successfully built program
[opencl_build_program] BUILD STATUS: 0
BUILD LOG:


[opencl_init] compiling program `extended.cl' ..
[opencl_load_program] loaded cached binary program from file 
`/home/jo/.cache/darktable/cached_kernels_for_GeForceGT730/extended.cl.bin'
[opencl_load_program] successfully loaded program from 
`/usr/share/darktable/kernels/extended.cl'
[opencl_build_program] successfully built program
[opencl_build_program] BUILD STATUS: 0
BUILD LOG:


[opencl_init] compiling program `soften.cl' ..
[opencl_load_program] loaded cached binary program from file 
`/home/jo/.cache/darktable/cached_kernels_for_GeForceGT730/soften.cl.bin'
[opencl_load_program] successfully loaded program from 
`/usr/share/darktable/kernels/soften.cl'
[opencl_build_program] successfully built program
[opencl_build_program] BUILD STATUS: 0
BUILD LOG:


[opencl_init] compiling program `bilateral.cl' ..
[opencl_load_program] loaded cached binary program from file 
`/home/jo/.cache/darktable/cached_kernels_for_GeForceGT730/bilateral.cl.bin'
[opencl_load_program] successfully loaded program from 
`/usr/share/darktable/kernels/bilateral.cl'
[opencl_build_program] successfully built program
[opencl_build_program] BUILD STATUS: 0
BUILD LOG:


[opencl_init] compiling program `denoiseprofile.cl' ..
[opencl_load_program] loaded cached binary program from file 
`/home/jo/.cache/darktable/cached_kernels_for_GeForceGT730/denoiseprofile.cl.bin'
[opencl_load_program] successfully loaded program from 
`/usr/share/darktable/kernels/denoiseprofile.cl'
[opencl_build_program] successfully built program
[opencl_build_program] BUILD STATUS: 0
BUILD LOG:


[opencl_init] compiling program `bloom.cl' ..
[opencl_load_program] loaded cached binary program from file 
`/home/jo/.cache/darktable/cached_kernels_for_GeForceGT730/bloom.cl.bin'
[opencl_load_program] successfully loaded program from 
`/usr/share/darktable/kernels/bloom.cl'
[opencl_build_program] successfully built program
[opencl_build_program] BUILD STATUS: 0
BUILD LOG:


[opencl_init] kernel loading time: 0.1881
[opencl_init] OpenCL successfully initialized.
[opencl_init] here are the internal numbers and names of OpenCL devices 
available to darktable:
[opencl_init]           0       'GeForce GT 730'
[opencl_init] these are your device priorities:
[opencl_init]           image   preview export  thumbnail
[opencl_init]           0       -1      0       0
[opencl_init] FINALLY: opencl is AVAILABLE on this system.
[opencl_init] initial status of opencl enabled flag is ON.
[opencl_create_kernel] successfully loaded kernel `zero' (0) for device 0
[opencl_create_kernel] successfully loaded kernel `splat' (1) for device 0
[opencl_create_kernel] successfully loaded kernel `blur_line' (2) for 
device 0
[opencl_create_kernel] successfully loaded kernel `blur_line_z' (3) for 
device 0
[opencl_create_kernel] successfully loaded kernel `slice' (4) for device 0
[opencl_create_kernel] successfully loaded kernel `slice_to_output' (5) 
for device 0
[opencl_create_kernel] successfully loaded kernel `gaussian_column_1c' 
(6) for device 0
[opencl_create_kernel] successfully loaded kernel 
`gaussian_transpose_1c' (7) for device 0
[opencl_create_kernel] successfully loaded kernel `gaussian_column_4c' 
(8) for device 0
[opencl_create_kernel] successfully loaded kernel 
`gaussian_transpose_4c' (9) for device 0
[opencl_create_kernel] successfully loaded kernel 
`interpolation_resample' (10) for device 0
[opencl_create_kernel] successfully loaded kernel `blendop_mask_Lab' 
(11) for device 0
[opencl_create_kernel] successfully loaded kernel `blendop_mask_RAW' 
(12) for device 0
[opencl_create_kernel] successfully loaded kernel `blendop_mask_rgb' 
(13) for device 0
[opencl_create_kernel] successfully loaded kernel `blendop_Lab' (14) for 
device 0
[opencl_create_kernel] successfully loaded kernel `blendop_RAW' (15) for 
device 0
[opencl_create_kernel] successfully loaded kernel `blendop_rgb' (16) for 
device 0
[opencl_create_kernel] successfully loaded kernel `blendop_copy_alpha' 
(17) for device 0
[opencl_create_kernel] successfully loaded kernel `blendop_set_mask' 
(18) for device 0
/usr/share/themes/Lubuntu-default/gtk-2.0/apps/thunar.rc:55: error: 
invalid string constant "thunar-statusbar", expected valid string constant
[opencl_create_kernel] successfully loaded kernel `relight' (19) for 
device 0
[opencl_create_kernel] successfully loaded kernel `overexposed' (20) for 
device 0
[opencl_create_kernel] successfully loaded kernel `levels' (21) for device 0
[opencl_create_kernel] successfully loaded kernel 
`lens_distort_bilinear' (22) for device 0
[opencl_create_kernel] successfully loaded kernel `lens_distort_bicubic' 
(23) for device 0
[opencl_create_kernel] successfully loaded kernel 
`lens_distort_lanczos2' (24) for device 0
[opencl_create_kernel] successfully loaded kernel 
`lens_distort_lanczos3' (25) for device 0
[opencl_create_kernel] successfully loaded kernel `lens_vignette' (26) 
for device 0
[opencl_create_kernel] successfully loaded kernel `nlmeans_init' (27) 
for device 0
[opencl_create_kernel] successfully loaded kernel `nlmeans_dist' (28) 
for device 0
[opencl_create_kernel] successfully loaded kernel `nlmeans_horiz' (29) 
for device 0
[opencl_create_kernel] successfully loaded kernel `nlmeans_vert' (30) 
for device 0
[opencl_create_kernel] successfully loaded kernel `nlmeans_accu' (31) 
for device 0
[opencl_create_kernel] successfully loaded kernel `nlmeans_finish' (32) 
for device 0
[opencl_create_kernel] successfully loaded kernel `graduatedndp' (33) 
for device 0
[opencl_create_kernel] successfully loaded kernel `graduatedndm' (34) 
for device 0
[opencl_create_kernel] successfully loaded kernel `colorize' (35) for 
device 0
[opencl_create_kernel] successfully loaded kernel `colorbalance' (36) 
for device 0
[opencl_create_kernel] successfully loaded kernel `highlights_1f' (37) 
for device 0
[opencl_create_kernel] successfully loaded kernel `highlights_4f' (38) 
for device 0
[opencl_create_kernel] successfully loaded kernel `eaw_decompose' (39) 
for device 0
[opencl_create_kernel] successfully loaded kernel `eaw_synthesize' (40) 
for device 0
[opencl_create_kernel] successfully loaded kernel `flip' (41) for device 0
[opencl_create_kernel] successfully loaded kernel `vignette' (42) for 
device 0
[opencl_create_kernel] successfully loaded kernel `lowlight' (43) for 
device 0
[opencl_create_kernel] successfully loaded kernel `pixelmax_first' (44) 
for device 0
[opencl_create_kernel] successfully loaded kernel `pixelmax_second' (45) 
for device 0
[opencl_create_kernel] successfully loaded kernel 
`global_tonemap_reinhard' (46) for device 0
[opencl_create_kernel] successfully loaded kernel `global_tonemap_drago' 
(47) for device 0
[opencl_create_kernel] successfully loaded kernel 
`global_tonemap_filmic' (48) for device 0
[opencl_create_kernel] successfully loaded kernel `letsgofloat_1ui' (49) 
for device 0
[opencl_create_kernel] successfully loaded kernel `invert_1f' (50) for 
device 0
[opencl_create_kernel] successfully loaded kernel `invert_4f' (51) for 
device 0
[opencl_create_kernel] successfully loaded kernel 
`colormapping_histogram' (52) for device 0
[opencl_create_kernel] successfully loaded kernel `colormapping_mapping' 
(53) for device 0
[opencl_create_kernel] successfully loaded kernel `colorout' (54) for 
device 0
[opencl_create_kernel] successfully loaded kernel `colisa' (55) for device 0
[opencl_create_kernel] successfully loaded kernel `whitebalance_4f' (56) 
for device 0
[opencl_create_kernel] successfully loaded kernel `whitebalance_1f' (57) 
for device 0
[opencl_create_kernel] successfully loaded kernel `splittoning' (58) for 
device 0
[opencl_create_kernel] successfully loaded kernel `basecurve' (59) for 
device 0
[opencl_create_kernel] successfully loaded kernel `colorcontrast' (60) 
for device 0
[opencl_create_kernel] successfully loaded kernel `clip_rotate_bilinear' 
(61) for device 0
[opencl_create_kernel] successfully loaded kernel `clip_rotate_bicubic' 
(62) for device 0
[opencl_create_kernel] successfully loaded kernel `clip_rotate_lanczos2' 
(63) for device 0
[opencl_create_kernel] successfully loaded kernel `clip_rotate_lanczos3' 
(64) for device 0
[opencl_create_kernel] successfully loaded kernel `borders_fill' (65) 
for device 0
[opencl_create_kernel] successfully loaded kernel `zonesystem' (66) for 
device 0
[opencl_create_kernel] successfully loaded kernel `colorcorrection' (67) 
for device 0
[opencl_create_kernel] successfully loaded kernel `soften_overexposed' 
(68) for device 0
[opencl_create_kernel] successfully loaded kernel `soften_hblur' (69) 
for device 0
[opencl_create_kernel] successfully loaded kernel `soften_vblur' (70) 
for device 0
[opencl_create_kernel] successfully loaded kernel `soften_mix' (71) for 
device 0
[opencl_create_kernel] successfully loaded kernel `bloom_threshold' (72) 
for device 0
[opencl_create_kernel] successfully loaded kernel `bloom_hblur' (73) for 
device 0
[opencl_create_kernel] successfully loaded kernel `bloom_vblur' (74) for 
device 0
[opencl_create_kernel] successfully loaded kernel `bloom_mix' (75) for 
device 0
[opencl_create_kernel] successfully loaded kernel `tonecurve' (76) for 
device 0
[opencl_create_kernel] successfully loaded kernel 
`shadows_highlights_mix' (77) for device 0
[opencl_create_kernel] successfully loaded kernel `vibrance' (78) for 
device 0
[opencl_create_kernel] successfully loaded kernel `highpass_invert' (79) 
for device 0
[opencl_create_kernel] successfully loaded kernel `highpass_hblur' (80) 
for device 0
[opencl_create_kernel] successfully loaded kernel `highpass_vblur' (81) 
for device 0
[opencl_create_kernel] successfully loaded kernel `highpass_mix' (82) 
for device 0
[opencl_create_kernel] successfully loaded kernel 
`clip_and_zoom_demosaic_half_size' (83) for device 0
[opencl_create_kernel] successfully loaded kernel `ppg_demosaic_green' 
(84) for device 0
[opencl_create_kernel] successfully loaded kernel `green_equilibration' 
(85) for device 0
[opencl_create_kernel] successfully loaded kernel `pre_median' (86) for 
device 0
[opencl_create_kernel] successfully loaded kernel 
`ppg_demosaic_green_median' (87) for device 0
[opencl_create_kernel] successfully loaded kernel `ppg_demosaic_redblue' 
(88) for device 0
[opencl_create_kernel] successfully loaded kernel `clip_and_zoom' (89) 
for device 0
[opencl_create_kernel] successfully loaded kernel `border_interpolate' 
(90) for device 0
[opencl_create_kernel] successfully loaded kernel `color_smoothing' (91) 
for device 0
[opencl_create_kernel] successfully loaded kernel `velvia' (92) for device 0
[opencl_create_kernel] successfully loaded kernel `colorin_unbound' (93) 
for device 0
[opencl_create_kernel] successfully loaded kernel `colorin_clipping' 
(94) for device 0
[opencl_create_kernel] successfully loaded kernel 
`denoiseprofile_precondition' (95) for device 0
[opencl_create_kernel] successfully loaded kernel `denoiseprofile_init' 
(96) for device 0
[opencl_create_kernel] successfully loaded kernel `denoiseprofile_dist' 
(97) for device 0
[opencl_create_kernel] successfully loaded kernel `denoiseprofile_horiz' 
(98) for device 0
[opencl_create_kernel] successfully loaded kernel `denoiseprofile_vert' 
(99) for device 0
[opencl_create_kernel] successfully loaded kernel `denoiseprofile_accu' 
(100) for device 0
[opencl_create_kernel] successfully loaded kernel 
`denoiseprofile_finish' (101) for device 0
[opencl_create_kernel] successfully loaded kernel 
`denoiseprofile_backtransform' (102) for device 0
[opencl_create_kernel] successfully loaded kernel 
`denoiseprofile_decompose' (103) for device 0
[opencl_create_kernel] successfully loaded kernel 
`denoiseprofile_synthesize' (104) for device 0
[opencl_create_kernel] successfully loaded kernel 
`denoiseprofile_reduce_first' (105) for device 0
[opencl_create_kernel] successfully loaded kernel 
`denoiseprofile_reduce_second' (106) for device 0
[opencl_create_kernel] successfully loaded kernel `sharpen_hblur' (107) 
for device 0
[opencl_create_kernel] successfully loaded kernel `sharpen_vblur' (108) 
for device 0
[opencl_create_kernel] successfully loaded kernel `sharpen_mix' (109) 
for device 0
[opencl_create_kernel] successfully loaded kernel `profilegamma' (110) 
for device 0
[opencl_create_kernel] successfully loaded kernel `exposure' (111) for 
device 0
[opencl_create_kernel] successfully loaded kernel `colorzones' (112) for 
device 0
[opencl_create_kernel] successfully loaded kernel `channelmixer' (113) 
for device 0
[opencl_create_kernel] successfully loaded kernel `lowpass_mix' (114) 
for device 0
[opencl_create_kernel] successfully loaded kernel `monochrome_filter' 
(115) for device 0
[opencl_create_kernel] successfully loaded kernel `monochrome' (116) for 
device 0
[pixelpipe_process] [thumbnail] using device 0
[pixelpipe_process] [thumbnail] using device 0
[pixelpipe_process] [thumbnail] using device -1
blockdenom vanishes
[pixelpipe_process] [thumbnail] using device 0
blockdenom vanishes
[pixelpipe_process] [thumbnail] using device 0
[pixelpipe_process] [thumbnail] using device -1
blockdenom vanishes
[pixelpipe_process] [thumbnail] using device 0
[pixelpipe_process] [thumbnail] using device -1
blockdenom vanishes
[pixelpipe_process] [full] using device 0
[pixelpipe_process] [preview] using device -1
[pixelpipe_process] [full] using device 0
[pixelpipe_process] [preview] using device -1
blockdenom vanishes
[pixelpipe_process] [full] using device 0
[pixelpipe_process] [full] using device 0
[pixelpipe_process] [full] using device 0
[pixelpipe_process] [full] using device 0
[pixelpipe_process] [preview] using device -1
[pixelpipe_process] [full] using device 0
blockdenom vanishes
[pixelpipe_process] [full] using device 0
[pixelpipe_process] [preview] using device -1
blockdenom vanishes
[pixelpipe_process] [full] using device 0
[pixelpipe_process] [preview] using device -1
blockdenom vanishes
[pixelpipe_process] [full] using device 0
[pixelpipe_process] [preview] using device -1
blockdenom vanishes
[pixelpipe_process] [full] using device 0
[pixelpipe_process] [full] using device 0
[pixelpipe_process] [full] using device 0
[pixelpipe_process] [preview] using device -1
[pixelpipe_process] [full] using device 0
blockdenom vanishes
[pixelpipe_process] [full] using device 0
[pixelpipe_process] [full] using device 0
[pixelpipe_process] [full] using device 0
[pixelpipe_process] [full] using device 0
[pixelpipe_process] [full] using device 0
[pixelpipe_process] [full] using device 0
[opencl_events_flush] could not get event info for '[Copy Image (on 
device)]': -5
[opencl_events_flush] could not get event info for 'eaw_decompose': -5
[opencl_events_flush] could not get event info for 'eaw_decompose': -5
[opencl_events_flush] could not get event info for 'eaw_decompose': -5
[opencl_events_flush] could not get event info for 'eaw_decompose': -5
[opencl_events_flush] could not get event info for 'eaw_decompose': -5
[opencl_events_flush] could not get event info for 'eaw_decompose': -5
[opencl_events_flush] could not get event info for 'eaw_decompose': -5
[opencl_events_flush] could not get event info for 'eaw_synthesize': -5
[opencl_events_flush] could not get event info for 'eaw_synthesize': -5
[opencl_events_flush] could not get event info for 'eaw_synthesize': -5
[opencl_events_flush] could not get event info for 'eaw_synthesize': -5
[opencl_events_flush] could not get event info for 'eaw_synthesize': -5
[opencl_events_flush] could not get event info for 'eaw_synthesize': -5
[opencl_events_flush] could not get event info for 'eaw_synthesize': -5
[opencl_pixelpipe] failed to run module 'atrous'. fall back to cpu path
[opencl_pixelpipe (b)] late opencl error detected while copying back to 
cpu buffer: -5
[pixelpipe_process] [full] falling back to cpu path
[pixelpipe_process] [full] using device 0
[opencl_pixelpipe] couldn't copy image to opencl device for module 
letsgofloat
[opencl_pixelpipe] failed to run module 'letsgofloat'. fall back to cpu path
[opencl_pixelpipe (b)] late opencl error detected while copying back to 
cpu buffer: -5
[pixelpipe_process] [full] falling back to cpu path
[pixelpipe_process] [full] using device 0
[opencl_pixelpipe] couldn't copy image to opencl device for module 
letsgofloat
[opencl_pixelpipe] failed to run module 'letsgofloat'. fall back to cpu path
[opencl_pixelpipe (b)] late opencl error detected while copying back to 
cpu buffer: -5
[pixelpipe_process] [full] falling back to cpu path
[pixelpipe_process] [preview] using device -1
[pixelpipe_process] [full] using device 0
[opencl_pixelpipe] couldn't copy image to opencl device for module 
letsgofloat
[opencl_pixelpipe] failed to run module 'letsgofloat'. fall back to cpu path
[opencl_pixelpipe (b)] late opencl error detected while copying back to 
cpu buffer: -5
[pixelpipe_process] [full] falling back to cpu path
[pixelpipe_process] [full] using device 0
[opencl_pixelpipe] couldn't copy image to opencl device for module 
letsgofloat
[opencl_pixelpipe] failed to run module 'letsgofloat'. fall back to cpu path
[opencl_pixelpipe (b)] late opencl error detected while copying back to 
cpu buffer: -5
[opencl] frequent opencl errors encountered; disabling opencl for this 
session!
[pixelpipe_process] [full] falling back to cpu path

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