Hi. Among the boot messages, there were the following lines: ---CUT--- [drm] This hardware requires preliminary hardware support See CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT, and/or modparam preliminary_hw_support ---CUT---
Then, a web search easily revealed this page: http://www.phoronix.com/scan.php?page=news_item&px=intel-skl-prelim-support The workaround is to append the following to the kernel command-line: i915.preliminary_hw_support=1 Hence I modified the variables GRUB_CMDLINE_LINUX_DEFAULT and GRUB_CMDLINE_LINUX in /etc/default/grub and then ran "update-grub". After rebooting, DRM is working. Perhaps this unexpected behaviour can be dealt with (or warned about) during install... Best regards, Gilles