Bug#894089: linux-image-4.9.0-6-amd64: Please fix max supported i915 screen (not display) resolution

[Marcin Owsiany]

Thank you for the contact, Ben. I will follow up with them.
FWIW, this patch does not even seem to work properly. While it does change
the max supported size reported by xrandr, trying to use the space just
results in an error.