Thread: Problem with one of the monitors

i have ubuntu 11.04 running on lenovo thinkpad t420, 2 monitors connected via advanced port replicator. monitor 1 connected vga port, monitor 2 connected using dvi cable.

here output of xrandr -q:

code:

$ xrandr -q  screen 0: minimum 320 x 200, current 2960 x 1050, maximum 8192 x 8192  lvds1 connected (normal left inverted right x axis y axis)     1600x900       60.0 +     1440x900       59.9       1360x768       59.8     60.0       1152x864       60.0       1024x768       60.0       800x600        60.3     56.2       640x480        59.9    vga1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 338mm x 270mm     1280x1024      60.0 +   75.0*      1024x768       75.1     70.1     60.0       832x624        74.6       800x600        72.2     75.0     60.3     56.2       640x480        72.8     75.0     66.7     60.0       720x400        70.1    hdmi1 disconnected (normal left inverted right x axis y axis)  dp1 disconnected (normal left inverted right x axis y axis)  hdmi2 disconnected (normal left inverted right x axis y axis)  hdmi3 connected 1680x1050+1280+0 (normal left inverted right x axis y axis) 459mm x 296mm     1680x1050      59.9*+     1280x1024      75.0     60.0       1440x900       75.0     59.9       1280x960       60.0       1280x800       74.9     59.8       1152x864       75.0       1280x720       50.0     60.0       1024x768       75.1     70.1     60.0       832x624        74.6       800x600        72.2     75.0     60.3     56.2       720x576        50.0       720x480        59.9       640x480        72.8     75.0     66.7     60.0       720x400        70.1    dp2 disconnected (normal left inverted right x axis y axis)  dp3 disconnected (normal left inverted right x axis y axis)

every time switch external monitors pressing fn+f7, image on vga display comes distorted. also, despite "same images on screens" unchecked, distorted screen mirror of image on dvi display (for reason, reported hdmi3).

way fix turn vga display off through system -> preferences -> monitors, select 75hz frequency, turn display again. produces extended desktop on both screens, should.

on distribution uses xorg.conf try adding correct modeline xorg.conf. on ubuntu, not generate xorg.conf file,

code:

sudo x -configure

produced errors , failed. suggestions please?

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