[ubuntu] why nomdeset solution runs in low resolution

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http://ubuntuforums.org – Installing 12.04 as dual boot on HP Pavilion dv4 with integrated intel graphic card, ran into the black screen. Tried nomodeset option and was able to bring the screen backup. I am also able to make it permanent by editing the grub. The only problem is that it appears to be running on 640x480 resolution. I need it to run 1366x768 the windows partition is running. I've tried everything in both the graphic card threads. I even tried 12.10 nightly release with 3.5 kernel. Nothing is working. Any help is appreciated. (Hardware)