Tomorrow I was trying to boot into Debian, but I got stuck in a login loop. I would be able to login, and the desktop screen would be shown for five seconds, after which it would log me out and show the login screen again. Since yesterday I have been researching about the issue and have found some possible solutions, but none seem to be working. I am running Debian Jessie with Gnome. Many of the proposed solutions are about ownership of certain files in the home directory, but this is not the case here, because I checked everything. Also problems with .xinitrc, .xsession or .Xauthority are not the issue. So after trying all the above, I tried starting gdm3 from root in tty and it would give me an error message. It is saying:
i915 firmware: failed to load i915:skl_dmc_ver1.bin (-2) i915 firmware: direct firmware load for i915:skl_dmc_ver1.bin failed with error -2 Failed to load DMC firmware [https://01.org/linuxgraphics/intel-linux-graphics-firmwares], disabling runtime power management
So I guess something seems to go wrong with the Intel graphics drivers? Or atleast I think so? I am not really an expert on all this stuff. Does anyone have an idea what might cause this? Or how I could solve this? Or what steps next to take? Everything used to work great for several months and I guess I did something wrong the day before yesterday, but for the love of Moore I cant seem to remember what I was doing then, nothing special atleast.