I tested my graphics card with another external monitor (a Dell 2408WFP) which runs with a native resolution of 1920x1200.
Using that monitor does not exhibit the bug and the driver/graphics card is able to run two monitors simultaneously at 1920x1200 (total resolution: 3840x1200). This shows me, that such a high resolution is definitely supported by my hardware (and by the nvidia-current driver?). But I'm still lost … why does one monitor work and another one with lower resolution does not? My current guess is different frequencies trip up the driver. Is there anybody out there with the slightest clue how to properly troubleshoot this problem? Interestingly, the Dell monitor does not show EDID data when queried with xrandr. Output of xrandr --verbose --query can be found below: Screen 0: minimum 8 x 8, current 3840 x 1200, maximum 8192 x 8192 VGA-0 connected 1920x1200+1920+0 (0x2c8) normal (normal left inverted right x axis y axis) 519mm x 324mm Identifier: 0x278 Timestamp: 217095 Subpixel: unknown Gamma: 1.0:1.0:1.0 Brightness: 1.0 Clones: CRTC: 1 CRTCs: 0 1 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: SignalFormat: VGA supported: VGA ConnectorType: VGA ConnectorNumber: 1 (0x00000001) _ConnectorLocation: 1 (0x00000001) 1920x1200 (0x2c8) 154.0MHz +HSync -VSync *current +preferred h: width 1920 start 1968 end 2000 total 2080 skew 0 clock 74.0KHz v: height 1200 start 1203 end 1209 total 1235 clock 60.0Hz 1600x1200 (0x2c9) 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 1280x1024 (0x2ca) 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 (0x2cb) 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 1152x864 (0x2cc) 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 (0x2cd) 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 (0x279) 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 (0x2ce) 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 (0x27e) 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 640x480 (0x2cf) 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 (0x282) 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: 0x286 Timestamp: 217095 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: SignalFormat: unknown supported: unknown ConnectorType: TV ConnectorNumber: 3 (0x00000003) _ConnectorLocation: 3 (0x00000003) LVDS-0 connected 1920x1200+0+0 (0x288) normal (normal left inverted right x axis y axis) 331mm x 207mm Identifier: 0x287 Timestamp: 217095 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 SignalFormat: LVDS supported: LVDS ConnectorType: Panel ConnectorNumber: 0 (0x00000000) _ConnectorLocation: 0 (0x00000000) 1920x1200 (0x288) 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: 0x289 Timestamp: 217095 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: SignalFormat: TMDS supported: TMDS ConnectorType: DVI-D ConnectorNumber: 2 (0x00000002) _ConnectorLocation: 2 (0x00000002) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to 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 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs