Comment 1 for bug 1422185

I am not an ubuntu user. I have an archlinux instalation with plasma 5 too. It have been working fine for a month. But yesterday, my desktop behaviour is exactly like yours.

In my case, I thought that this was due to an xorg-server package update (now I have xorg-server 1.7.1 installed in my arch distro) because at minute 3 from boot, the following message was shown at the end of the Xorg.0.log file:

"(II) AIGLX: Suspending AIGLX clients for VT switch"

But, the matter is not clear for me at all.