I assume you already have checked dmesg and ~/.xsession-errors !? I had a recent freeze on startup that I could solve by moving ~/.config/kwinrc away and restarting the machine.
AMD64, unstable here with Intel Gfx. Tim On Monday 23 November 2015 16:54:06 MERLIN Philippe wrote: > Hello, > My system is one Sid AMD64 Kde, Sid wants to say unstable > distribution, at present its name even a little too much to my taste. > Further to the last ones update Debian: gcc-5, libstdc kde jams > constantly, in the starting up with the only one the screen of starting > up and visible progress, black screen... > Today to send you this message I already have to rebooter 5 times. > Am I the only one in this galley? What can you we make? > Philippe Merlin