I am having the same problem on up-to-date Kubuntu on x200s with Intel graphics. If suspend is done by PowerDevil (KDE4 power manager), either by closing lid or selecting Suspend from menu, I get KDM login screen after resume.
If I start suspend from command line (sudo pm-suspend), resume works and I get my KDE session back after resume.
I am having the same problem on up-to-date Kubuntu on x200s with Intel graphics. If suspend is done by PowerDevil (KDE4 power manager), either by closing lid or selecting Suspend from menu, I get KDM login screen after resume.
If I start suspend from command line (sudo pm-suspend), resume works and I get my KDE session back after resume.