The problem Described in X/Troubleshooting/IntelPerformance, some laptops with intel graphics hardware experience a serious performance degration after upgrading from intrepid to jaunty. The reasons for that are already explained on that page. This page explains how to revert the driver to the version in intrepid. Installing the package Add the following lines to your /etc/apt/sources.list: deb ht
{{#tags}}- {{label}}
{{/tags}}