Bug#928121: Same problem on Lenovo T480

[Shannon Dealy]

I'm having what appears to be the same problem with a few differences of note:

 - Lenovo T480 (original report was for a T580)
 - Linux kernel 4.19.0-6-amd64
 - lxdm
 - xfce4
 - External monitor connected via HDMI

Shannon C. Dealy               |       DeaTech Research Inc.
de...@deatech.com              | Biotechnology Development Services
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