Run apt-get update & apt-get upgrade to ensure your system is up to date.You’ll also have to tell the repository manager what your preferred release channel is. The instructions below will setup the system to know about packages from the testing channel, but ignore all of them unless expressly told otherwise. You’ll have to adjust your package repository to install some software from the testing channel without updating the whole system. You may experience package dependency conflicts, but Debian is pretty good at resolving these automatically. Luckily, you can easily upgrade the graphics driver running on Debian stable to the testing version and leave the rest of your system on stable. The older driver doesn’t support Intel’s most recent graphics cards and you’ll either have a non-functioning graphics driver or serious performance problems. If you’re on the Debian stable release, you’re currently using the more-than-a-year-old 2.21.15 driver.

The Debian GNU/Linux project recently migrated the Intel graphics drivers version 2.99.917 into their testing release channel. Let’s stay comfortable and get the newer drivers anyway. Debian stable is safe and comfortable, but Debian testing has got better performing Intel graphics drivers.

Intel graphics card update