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I just installed the Nvidia 304.51 and it works great, the problem is that now the Unity Launcher doesn't auto-hide. I found this bug report so it seems there isn't a way to fix it. One way to get auto-hide again it would be to downgrade to the last version of the Nvidia drivers (so it shows in the bug report comments), the thing is that I didn't install the drivers using PPA but using this method.

Any ideas on how I can downgrade my Nvidia drivers to "fix" this?

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Have you checked system settings > appearance > behavior? There Auto hide option must be checked. – Mostafa Shahverdy Feb 24 '13 at 18:03

To downgrade a package you can use the command

sudo dpkg -i <packagenamehere>

Did the auto hide option in the appearance settings just get unchecked?

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