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)
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https://bugs.launchpad.net/bugs/727112
Title:
nvidia-current does not detect hardware capabilities correctly
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