Hi Graeme. Thanks for looking at this. The verbose/debug output of dispwin and xrandr follows. - William % sudo dispwin -v -E -I VX922.icc Checking XRandR 1.2 VideoLUT access Display 0 name = ':0.0' Failed to get EDID for display About to open dispwin object on the display Opened display OK dispwin_get_ramdac called Getting gamma using Randr 1.2 About to install 'VX922.icc' as display's default profile dispwin_set_ramdac called Setting gamma using Randr 1.2 X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 157 (RANDR) Minor opcode of failed request: 13 () Value in failed request: 0x89 Serial number of failed request: 12 Current serial number in output stream: 14 % xrandr --verbose Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 1280 x 1280 DFP2 connected 1280x1024+0+0 (0x8d) normal (normal left inverted right x axis y axis) 376mm x 301mm Identifier: 0x89 Timestamp: 891369 Subpixel: unknown Clones: CRTC: 0 CRTCs: 0 1 Panning: 0x0+0+0 Tracking: 0x0+0+0 Border: 0/0/0/0 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: 1280x1024 (0x8d) 108.0MHz +HSync +VSync *current +preferred h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 64.0KHz v: height 1024 start 1025 end 1028 total 1066 clock 60.0Hz 1280x1024 (0x8e) 135.0MHz +HSync +VSync h: width 1280 start 1296 end 1440 total 1688 skew 0 clock 80.0KHz v: height 1024 start 1025 end 1028 total 1066 clock 75.0Hz 1280x1024 (0x8d) 108.0MHz +HSync +VSync *current h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 64.0KHz v: height 1024 start 1025 end 1028 total 1066 clock 60.0Hz 1280x960 (0x8f) 108.0MHz +HSync +VSync h: width 1280 start 1376 end 1488 total 1800 skew 0 clock 60.0KHz v: height 960 start 961 end 964 total 1000 clock 60.0Hz 1152x864 (0x90) 108.0MHz +HSync +VSync h: width 1152 start 1216 end 1344 total 1600 skew 0 clock 67.5KHz v: height 864 start 865 end 868 total 900 clock 75.0Hz 1152x864 (0x91) 81.6MHz -HSync +VSync h: width 1152 start 1216 end 1336 total 1520 skew 0 clock 53.7KHz v: height 864 start 865 end 868 total 895 clock 60.0Hz 1280x768 (0x92) 79.5MHz -HSync +VSync h: width 1280 start 1344 end 1472 total 1664 skew 0 clock 47.8KHz v: height 768 start 771 end 778 total 798 clock 59.9Hz 1280x720 (0x93) 74.5MHz -HSync +VSync h: width 1280 start 1336 end 1472 total 1664 skew 0 clock 44.8KHz v: height 720 start 721 end 724 total 746 clock 60.0Hz 1024x768 (0x94) 78.8MHz +HSync +VSync h: width 1024 start 1040 end 1136 total 1312 skew 0 clock 60.0KHz v: height 768 start 769 end 772 total 800 clock 75.0Hz 1024x768 (0x95) 75.0MHz -HSync -VSync h: width 1024 start 1048 end 1184 total 1328 skew 0 clock 56.5KHz v: height 768 start 771 end 777 total 806 clock 70.1Hz 1024x768 (0x96) 65.0MHz -HSync -VSync h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.4KHz v: height 768 start 771 end 777 total 806 clock 60.0Hz 800x600 (0x97) 50.0MHz +HSync +VSync h: width 800 start 856 end 976 total 1040 skew 0 clock 48.1KHz v: height 600 start 637 end 643 total 666 clock 72.2Hz 800x600 (0x98) 49.5MHz +HSync +VSync h: width 800 start 816 end 896 total 1056 skew 0 clock 46.9KHz v: height 600 start 601 end 604 total 625 clock 75.0Hz 800x600 (0x99) 45.5MHz -HSync +VSync h: width 800 start 840 end 920 total 1040 skew 0 clock 43.8KHz v: height 600 start 601 end 604 total 625 clock 70.0Hz 800x600 (0x9a) 40.0MHz +HSync +VSync h: width 800 start 840 end 968 total 1056 skew 0 clock 37.9KHz v: height 600 start 601 end 605 total 628 clock 60.3Hz 800x600 (0x9b) 36.0MHz +HSync +VSync h: width 800 start 824 end 896 total 1024 skew 0 clock 35.2KHz v: height 600 start 601 end 603 total 625 clock 56.2Hz 720x480 (0x9c) 26.7MHz -HSync +VSync h: width 720 start 736 end 808 total 896 skew 0 clock 29.8KHz v: height 480 start 481 end 484 total 497 clock 60.0Hz 640x480 (0x9d) 31.5MHz -HSync -VSync h: width 640 start 656 end 720 total 840 skew 0 clock 37.5KHz v: height 480 start 481 end 484 total 500 clock 75.0Hz 640x480 (0x9e) 31.5MHz -HSync -VSync h: width 640 start 664 end 704 total 832 skew 0 clock 37.9KHz v: height 480 start 489 end 492 total 520 clock 72.8Hz 640x480 (0x9d) 31.5MHz -HSync -VSync h: width 640 start 656 end 720 total 840 skew 0 clock 37.5KHz v: height 480 start 481 end 484 total 500 clock 75.0Hz 640x480 (0x9f) 25.2MHz -HSync -VSync h: width 640 start 656 end 752 total 800 skew 0 clock 31.5KHz v: height 480 start 490 end 492 total 525 clock 60.0Hz 640x400 (0xa0) 28.1MHz +HSync +VSync h: width 640 start 696 end 736 total 832 skew 0 clock 33.7KHz v: height 400 start 413 end 415 total 449 clock 75.1Hz 640x400 (0xa1) 24.9MHz +HSync +VSync h: width 640 start 664 end 760 total 792 skew 0 clock 31.5KHz v: height 400 start 460 end 462 total 525 clock 59.9Hz 512x384 (0xa2) 19.8MHz +HSync +VSync h: width 512 start 544 end 624 total 664 skew 0 clock 29.8KHz v: height 384 start 451 end 453 total 497 clock 60.0Hz 512x384 (0xa3) 19.7MHz +HSync +VSync h: width 512 start 528 end 576 total 632 skew 0 clock 31.1KHz v: height 384 start 384 end 385 total 416 clock 74.9Hz 400x300 (0xa4) 24.8MHz +HSync +VSync DoubleScan h: width 400 start 408 end 448 total 528 skew 0 clock 46.9KHz v: height 300 start 601 end 602 total 625 clock 75.0Hz 400x300 (0xa5) 22.3MHz +HSync +VSync DoubleScan h: width 400 start 416 end 480 total 496 skew 0 clock 45.0KHz v: height 300 start 601 end 605 total 742 clock 60.7Hz 320x240 (0xa6) 15.8MHz +HSync +VSync DoubleScan h: width 320 start 328 end 360 total 416 skew 0 clock 37.9KHz v: height 240 start 481 end 482 total 501 clock 75.6Hz 320x240 (0xa7) 12.6MHz +HSync +VSync DoubleScan h: width 320 start 328 end 376 total 400 skew 0 clock 31.5KHz v: height 240 start 491 end 493 total 525 clock 60.0Hz 320x200 (0xa8) 13.1MHz +HSync +VSync DoubleScan h: width 320 start 352 end 368 total 416 skew 0 clock 31.5KHz v: height 200 start 406 end 407 total 417 clock 75.5Hz 320x200 (0xa9) 12.6MHz +HSync +VSync DoubleScan h: width 320 start 336 end 384 total 400 skew 0 clock 31.5KHz v: height 200 start 457 end 459 total 524 clock 60.1Hz DFP_EXTTMDS disconnected (normal left inverted right x axis y axis) Identifier: 0x8a Timestamp: 891369 Subpixel: unknown Clones: CRTCs: 0 1 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: CRT1 disconnected (normal left inverted right x axis y axis) Identifier: 0x8b Timestamp: 891369 Subpixel: unknown Clones: CRTCs: 0 1 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: CRT2 disconnected (normal left inverted right x axis y axis) Identifier: 0x8c Timestamp: 891369 Subpixel: unknown Clones: CRTCs: 0 1 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: