Comment 24 for bug 1070150

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Fiorenzo De Santis (fiod3s) wrote : Re: Intermittent low graphics mode with Intel HD graphics

I was affected as well but after I upgraded with the software from xorg-edgers PPA, and I selected lightdm again, the problem has gone.

So I think that this isn't a problem of lightdm rather it's a problem of xorg related software.

If you want to upgrade too, you should refer to https://launchpad.net/~xorg-edgers/+archive/ppa