Yes, the 3150 supports screen rotation in Windows 7 Starter on the N450. I have a Lenovo S10-3. To change the rotation on my netbook, I
1) Right click on the desktop, select "Graphics Properties"
2) Select the "Display Settings" tab
3) Make sure the "Enable Rotation" checkbox is checked, and select one of the degrees
4) Click OK or Apply
If you cannot follow these same steps, then you should first look for a 3150 driver update, then look for a BIOS update for the motherboard.
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This evidently is an ACER issue. I have the Aspire One D255 with the 3150 processor and I have not been able to find a solution to this. Third party Irotate and eeerotate don't work either.
I suspect Acer plans on releasing a tablet PC soon and does not want this nice netbook feature to cripple sales of the new device.
There is no reason to lock this function out.
I have same issue on an Acer Aspire One D544-13DKK with Windows 7 - no rotation / orientation no matter what I do.
Acer Support is no use as all - first they claimed that rotation was not supported by Windows 7 Starter (which is untrue) and told me to upgrade. Then they refused to offer support since I had changed "their" OS aso. When I downgraded to Starter again they had a third story. Pure run-around or a very clueless support.
Well, I have tried irotate as well - no luck, expect that the one bundled with eeerotate did not exit with an execption. Several registry tweaks only allowed me to change resolution to almost any value - but still no rotation. As I am not hardcore enough to tweak the PCI registers to attempt to re-enable rotation that way, I am currently considering downgrading to Windows XP...
Anyhow - I can only recommend NOT to buy anything from Acer - no, buy anything but Acer