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Black screen after changing resolution

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http://askubuntu.com – i have Dell Latitude E5430 laptop with Intel GMA HD 4000 graphics. Ubuntu 11.10 unrecognizes graphics and system info shows it as "Unknown". My external monitor ViewSonic VG730m is also listed as "Unknown". Maximum resolution i can take is 1024x768. Optimal resolution for monitor is 1280x1024. So i did this: root@Latitude-E5430:~# xrandr Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192 LVDS1 connected (normal left inverted right x axis y axis) 1600x900 60.0 + 40.0 1440x900 59.9 1360x768 59.8 60.0 1152x864 60.0 1024x768 60.0 800x600 60.3 56.2 640x480 59.9 VGA1 connected 102 (HowTos)