You need to given all the fundamental changes to the Intel driver, and especially now with KMS, external display support has been quite in flux. One of the issue encounter is that the maximum virtual screen size depending on driver version (or in the case of KMS, the kernel). This is significant if you want to have an comprehensive desktop (dual-display), but not for Mirror mode. If you’re using KMS, depending on what patch made it keen on the kernel the maximum virtual screensize is either 2048x2048 or 4096x4096. If you’re not using KMS, depending on the Intel driver version it will be either 1280x1280 or 2048x2048. 4096x4096 is not potential without KMS, and even then you authority have to add the patch to your kernel to enable it. To see what your practical screen size is, simply run xrandr from a cmdline and appear for something like this
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Screen 0: minimum 320 x 200, current 1400 x 1050, maximum 4096 x 4096
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