I just performed further tests with a system booted from an USB drive. The bug happens regardless of architecture, both amd64 and i386 are affected.
With the nouveau driver I managed to run both monitors with native resolution, but the external monitor showed graphic errors (see the attached screenshot). Also, the system was feeling very sluggish with two monitors. xrandr --query --verbose when using the nouveau driver outputs: Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 8192 x 8192 LVDS-1 connected 1920x1200+0+0 (0x65) normal (normal left inverted right x axis y axis) 331mm x 207mm Identifier: 0x61 Timestamp: 27086 Subpixel: unknown Gamma: 1.0:1.0:1.0 Brightness: 1.0 Clones: CRTC: 0 CRTCs: 0 1 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: EDID: 00ffffffffffff004ca3553200000000 00120103802115780a87f594574f8c27 27505400000001010101010101010101 0101010101018c41805871b023406420 26004bcf100000190000000f00000000 000000000046d2026400000000fe0059 323834470031353455320a20000000fe 0017272f3f5f97afff02010a20200039 dithering depth: auto supported: auto 6 bpc 8 bpc dithering mode: auto supported: auto off static 2x2 dynamic 2x2 scaling mode: Full supported: None Full Center Full aspect color vibrance: 150 (0x00000096) range: (0,200) vibrant hue: 90 (0x0000005a) range: (0,180) 1920x1200 (0x65) 167.8MHz -HSync -VSync *current +preferred h: width 1920 start 2020 end 2052 total 2264 skew 0 clock 74.1KHz v: height 1200 start 1202 end 1208 total 1235 clock 60.0Hz 1920x1200 (0x66) 193.2MHz -HSync +VSync h: width 1920 start 2056 end 2256 total 2592 skew 0 clock 74.6KHz v: height 1200 start 1203 end 1209 total 1245 clock 59.9Hz 1920x1080 (0x67) 173.0MHz -HSync +VSync h: width 1920 start 2048 end 2248 total 2576 skew 0 clock 67.2KHz v: height 1080 start 1083 end 1088 total 1120 clock 60.0Hz 1600x1200 (0x68) 161.0MHz -HSync +VSync h: width 1600 start 1712 end 1880 total 2160 skew 0 clock 74.5KHz v: height 1200 start 1203 end 1207 total 1245 clock 59.9Hz 1680x1050 (0x69) 146.2MHz -HSync +VSync h: width 1680 start 1784 end 1960 total 2240 skew 0 clock 65.3KHz v: height 1050 start 1053 end 1059 total 1089 clock 60.0Hz 1400x1050 (0x6a) 121.8MHz -HSync +VSync h: width 1400 start 1488 end 1632 total 1864 skew 0 clock 65.3KHz v: height 1050 start 1053 end 1057 total 1089 clock 60.0Hz 1280x1024 (0x6b) 109.0MHz -HSync +VSync h: width 1280 start 1368 end 1496 total 1712 skew 0 clock 63.7KHz v: height 1024 start 1027 end 1034 total 1063 clock 59.9Hz 1280x960 (0x6c) 101.2MHz -HSync +VSync h: width 1280 start 1360 end 1488 total 1696 skew 0 clock 59.7KHz v: height 960 start 963 end 967 total 996 clock 59.9Hz 1152x864 (0x6d) 81.8MHz -HSync +VSync h: width 1152 start 1216 end 1336 total 1520 skew 0 clock 53.8KHz v: height 864 start 867 end 871 total 897 clock 60.0Hz 1024x768 (0x6e) 63.5MHz -HSync +VSync h: width 1024 start 1072 end 1176 total 1328 skew 0 clock 47.8KHz v: height 768 start 771 end 775 total 798 clock 59.9Hz 800x600 (0x6f) 38.2MHz -HSync +VSync h: width 800 start 832 end 912 total 1024 skew 0 clock 37.4KHz v: height 600 start 603 end 607 total 624 clock 59.9Hz 640x480 (0x70) 23.8MHz -HSync +VSync h: width 640 start 664 end 720 total 800 skew 0 clock 29.7KHz v: height 480 start 483 end 487 total 500 clock 59.4Hz 720x400 (0x71) 22.2MHz -HSync +VSync h: width 720 start 744 end 808 total 896 skew 0 clock 24.8KHz v: height 400 start 403 end 413 total 417 clock 59.6Hz 640x400 (0x72) 20.0MHz -HSync +VSync h: width 640 start 664 end 720 total 800 skew 0 clock 25.0KHz v: height 400 start 403 end 409 total 417 clock 60.0Hz 640x350 (0x73) 17.5MHz -HSync +VSync h: width 640 start 664 end 720 total 800 skew 0 clock 21.9KHz v: height 350 start 353 end 363 total 366 clock 59.8Hz VGA-1 connected (normal left inverted right x axis y axis) Identifier: 0x62 Timestamp: 27086 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: EDID: 00ffffffffffff0045b8212401010101 0214010368341e782aeed5a555489b26 125054bfef80b300a940950081408180 950f714f9040944380907238284080c8 350009252100001c000000ff00373039 3035303636303030310a000000fd0037 4c1d5112000a202020202020000000fc 005132340a2020202020202020200086 scaling mode: None supported: None Full Center Full aspect color vibrance: 150 (0x00000096) range: (0,200) vibrant hue: 90 (0x0000005a) range: (0,180) 1920x1080 (0x67) 173.0MHz -HSync +VSync +preferred h: width 1920 start 2048 end 2248 total 2576 skew 0 clock 67.2KHz v: height 1080 start 1083 end 1088 total 1120 clock 60.0Hz 1600x1200 (0x74) 175.5MHz +HSync +VSync h: width 1600 start 1664 end 1856 total 2160 skew 0 clock 81.2KHz v: height 1200 start 1201 end 1204 total 1250 clock 65.0Hz 1600x1200 (0x75) 162.0MHz +HSync +VSync h: width 1600 start 1664 end 1856 total 2160 skew 0 clock 75.0KHz v: height 1200 start 1201 end 1204 total 1250 clock 60.0Hz 1680x1050 (0x69) 146.2MHz -HSync +VSync h: width 1680 start 1784 end 1960 total 2240 skew 0 clock 65.3KHz v: height 1050 start 1053 end 1059 total 1089 clock 60.0Hz 1680x945 (0x76) 131.5MHz -HSync +VSync h: width 1680 start 1784 end 1960 total 2240 skew 0 clock 58.7KHz v: height 945 start 946 end 949 total 978 clock 60.0Hz 1400x1050 (0x6a) 121.8MHz -HSync +VSync h: width 1400 start 1488 end 1632 total 1864 skew 0 clock 65.3KHz v: height 1050 start 1053 end 1057 total 1089 clock 60.0Hz 1600x900 (0x77) 119.0MHz -HSync +VSync h: width 1600 start 1696 end 1864 total 2128 skew 0 clock 55.9KHz v: height 900 start 901 end 904 total 932 clock 60.0Hz 1280x1024 (0x78) 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 (0x79) 108.0MHz +HSync +VSync 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 1440x900 (0x7a) 136.8MHz -HSync +VSync h: width 1440 start 1536 end 1688 total 1936 skew 0 clock 70.6KHz v: height 900 start 903 end 909 total 942 clock 75.0Hz 1440x900 (0x7b) 106.5MHz -HSync +VSync h: width 1440 start 1520 end 1672 total 1904 skew 0 clock 55.9KHz v: height 900 start 903 end 909 total 934 clock 59.9Hz 1280x960 (0x7c) 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 1366x768 (0x7d) 85.9MHz -HSync +VSync h: width 1366 start 1439 end 1583 total 1800 skew 0 clock 47.7KHz v: height 768 start 769 end 772 total 795 clock 60.0Hz 1360x768 (0x7e) 85.5MHz +HSync +VSync h: width 1360 start 1424 end 1536 total 1792 skew 0 clock 47.7KHz v: height 768 start 771 end 777 total 795 clock 60.0Hz 1280x800 (0x7f) 106.5MHz -HSync +VSync h: width 1280 start 1360 end 1488 total 1696 skew 0 clock 62.8KHz v: height 800 start 803 end 809 total 838 clock 74.9Hz 1280x800 (0x80) 83.5MHz +HSync -VSync h: width 1280 start 1352 end 1480 total 1680 skew 0 clock 49.7KHz v: height 800 start 803 end 809 total 831 clock 59.8Hz 1152x864 (0x81) 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 1280x768 (0x82) 102.2MHz +HSync -VSync h: width 1280 start 1360 end 1488 total 1696 skew 0 clock 60.3KHz v: height 768 start 771 end 778 total 805 clock 74.9Hz 1280x768 (0x83) 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 1024x768 (0x84) 78.8MHz +HSync +VSync h: width 1024 start 1040 end 1136 total 1312 skew 0 clock 60.1KHz v: height 768 start 769 end 772 total 800 clock 75.1Hz 1024x768 (0x85) 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 (0x86) 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 1024x576 (0x87) 47.0MHz -HSync +VSync h: width 1024 start 1064 end 1168 total 1312 skew 0 clock 35.8KHz v: height 576 start 577 end 580 total 597 clock 60.0Hz 832x624 (0x88) 57.3MHz -HSync -VSync h: width 832 start 864 end 928 total 1152 skew 0 clock 49.7KHz v: height 624 start 625 end 628 total 667 clock 74.6Hz 800x600 (0x89) 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 (0x8a) 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 (0x8b) 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 (0x8c) 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 848x480 (0x8d) 33.8MHz +HSync +VSync h: width 848 start 864 end 976 total 1088 skew 0 clock 31.0KHz v: height 480 start 486 end 494 total 517 clock 60.0Hz 640x480 (0x8e) 31.5MHz -HSync -VSync h: width 640 start 664 end 704 total 832 skew 0 clock 37.9KHz v: height 480 start 489 end 491 total 520 clock 72.8Hz 640x480 (0x8f) 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 (0x90) 30.2MHz -HSync -VSync h: width 640 start 704 end 768 total 864 skew 0 clock 35.0KHz v: height 480 start 483 end 486 total 525 clock 66.7Hz 640x480 (0x91) 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 720x400 (0x92) 28.3MHz -HSync +VSync h: width 720 start 738 end 846 total 900 skew 0 clock 31.5KHz v: height 400 start 412 end 414 total 449 clock 70.1Hz DVI-D-1 disconnected (normal left inverted right x axis y axis) Identifier: 0x63 Timestamp: 27086 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: dithering depth: auto supported: auto 6 bpc 8 bpc dithering mode: auto supported: auto off static 2x2 dynamic 2x2 scaling mode: Full supported: None Full Center Full aspect color vibrance: 150 (0x00000096) range: (0,200) vibrant hue: 90 (0x0000005a) range: (0,180) underscan vborder: 0 (0x00000000) range: (0,128) underscan hborder: 0 (0x00000000) range: (0,128) underscan: off supported: auto off on When using the nvidia-current driver, only the native resolution is shown as supported for the laptop panel: Screen 0: minimum 8 x 8, current 1920 x 1200, maximum 8192 x 8192 VGA-0 connected (normal left inverted right x axis y axis) Identifier: 0x278 Timestamp: 214522 Subpixel: unknown Clones: CRTCs: 1 0 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: EDID: 00ffffffffffff0045b8212401010101 0214010368341e782aeed5a555489b26 125054bfef80b300a940950081408180 950f714f9040944380907238284080c8 350009252100001c000000ff00373039 3035303636303030310a000000fd0037 4c1d5112000a202020202020000000fc 005132340a2020202020202020200086 SignalFormat: VGA supported: VGA ConnectorType: VGA ConnectorNumber: 1 (0x00000001) _ConnectorLocation: 1 (0x00000001) 1920x1080 (0x2a6) 173.0MHz -HSync +VSync +preferred h: width 1920 start 2048 end 2248 total 2576 skew 0 clock 67.2KHz v: height 1080 start 1083 end 1088 total 1120 clock 60.0Hz 1680x1050 (0x2a7) 146.2MHz -HSync +VSync h: width 1680 start 1784 end 1960 total 2240 skew 0 clock 65.3KHz v: height 1050 start 1053 end 1059 total 1089 clock 60.0Hz 1600x1200 (0x2a8) 162.0MHz +HSync +VSync h: width 1600 start 1664 end 1856 total 2160 skew 0 clock 75.0KHz v: height 1200 start 1201 end 1204 total 1250 clock 60.0Hz 1440x900 (0x2a9) 136.8MHz -HSync +VSync h: width 1440 start 1536 end 1688 total 1936 skew 0 clock 70.6KHz v: height 900 start 903 end 909 total 942 clock 75.0Hz 1440x900 (0x2aa) 106.5MHz -HSync +VSync h: width 1440 start 1520 end 1672 total 1904 skew 0 clock 55.9KHz v: height 900 start 903 end 909 total 934 clock 59.9Hz 1400x1050 (0x2ab) 121.8MHz -HSync +VSync h: width 1400 start 1488 end 1632 total 1864 skew 0 clock 65.3KHz v: height 1050 start 1053 end 1057 total 1089 clock 60.0Hz 1280x1024 (0x2ac) 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 (0x2ad) 108.0MHz +HSync +VSync 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 (0x2ae) 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 (0x2af) 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 1024x768 (0x2b0) 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 (0x2b1) 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 (0x2b2) 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 (0x2b3) 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 (0x2b4) 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 (0x2b5) 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 (0x2b6) 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 640x480 (0x2b7) 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 (0x2b8) 31.5MHz -HSync -VSync h: width 640 start 656 end 696 total 832 skew 0 clock 37.9KHz v: height 480 start 481 end 484 total 520 clock 72.8Hz 640x480 (0x2b9) 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 59.9Hz TV-0 disconnected (normal left inverted right x axis y axis) Identifier: 0x279 Timestamp: 214522 Subpixel: unknown Clones: CRTCs: 1 0 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: SignalFormat: unknown supported: unknown ConnectorType: TV ConnectorNumber: 3 (0x00000003) _ConnectorLocation: 3 (0x00000003) LVDS-0 connected 1920x1200+0+0 (0x27b) normal (normal left inverted right x axis y axis) 331mm x 207mm Identifier: 0x27a Timestamp: 214522 Subpixel: unknown Gamma: 1.0:1.0:1.0 Brightness: 1.0 Clones: CRTC: 0 CRTCs: 1 0 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: EDID: 00ffffffffffff004ca3553200000000 00120103802115780a87f594574f8c27 27505400000001010101010101010101 0101010101018c41805871b023406420 26004bcf100000190000000f00000000 000000000046d2026400000000fe0059 323834470031353455320a20000000fe 0017272f3f5f97afff02010a20200039 SignalFormat: LVDS supported: LVDS ConnectorType: Panel ConnectorNumber: 0 (0x00000000) _ConnectorLocation: 0 (0x00000000) 1920x1200 (0x27b) 167.8MHz -HSync -VSync *current +preferred h: width 1920 start 2020 end 2052 total 2264 skew 0 clock 74.1KHz v: height 1200 start 1202 end 1208 total 1235 clock 60.0Hz DVI-D-0 disconnected (normal left inverted right x axis y axis) Identifier: 0x27c Timestamp: 214522 Subpixel: unknown Clones: CRTCs: 1 0 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: SignalFormat: TMDS supported: TMDS ConnectorType: DVI-D ConnectorNumber: 2 (0x00000002) _ConnectorLocation: 2 (0x00000002) xrandr returns the same EDID data regardless of driver used. parse-edid outputs (1. laptop panel, 2. external monitor): # EDID version 1 revision 3 Section "Monitor" # Block type: 2:0 3:f # Block type: 2:0 3:fe # Block type: 2:0 3:fe Identifier "SEC:5532" VendorName "SEC" ModelName "SEC:5532" # Block type: 2:0 3:f # Block type: 2:0 3:fe # Block type: 2:0 3:fe # DPMS capabilities: Active off:no Suspend:no Standby:no Mode "1920x1200" # vfreq 60.013Hz, hfreq 74.117kHz DotClock 167.800000 HTimings 1920 2020 2052 2264 VTimings 1200 1202 1208 1235 Flags "-HSync" "-VSync" EndMode # Block type: 2:0 3:f # Block type: 2:0 3:fe # Block type: 2:0 3:fe EndSection --- # EDID version 1 revision 3 Section "Monitor" # Block type: 2:0 3:ff # Block type: 2:0 3:fd # Block type: 2:0 3:fc Identifier "Q24" VendorName "QMX" ModelName "Q24" # Block type: 2:0 3:ff # Block type: 2:0 3:fd HorizSync 29-81 VertRefresh 55-76 # Max dot clock (video bandwidth) 180 MHz # Block type: 2:0 3:fc # DPMS capabilities: Active off:yes Suspend:no Standby:no Mode "1920x1080" # vfreq 59.963Hz, hfreq 67.158kHz DotClock 173.000000 HTimings 1920 2048 2248 2576 VTimings 1080 1083 1088 1120 Flags "+HSync" "-VSync" EndMode # Block type: 2:0 3:ff # Block type: 2:0 3:fd # Block type: 2:0 3:fc EndSection ** Attachment added: "Graphic errors with nouveau driver" https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/727112/+attachment/3466596/+files/nouveau1.png -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-graphics-drivers in Ubuntu. https://bugs.launchpad.net/bugs/727112 Title: nvidia-current does not detect hardware capabilities correctly To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/727112/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp