Comment 5 for bug 1770565

Since installing this kernel, I see instant screen garbage or blanking (everything but the cursor), when attaching / removing a second / third screen on My Lenovo Thinkpad T440s.

Older kernels do not suffer these problems. A restart of lightdm makes the problems go away and makes a second screen be detected as expected.

What logs would be usefull? Xorg.0.log doesn't realy have anything out of the ordinary, nor does Dmesg.