drm/i915: "Wrong MCH_SSKPD value: 0x16040307"

0) A ThinkPad X220 I use prints these messages at every boot and at every resume: [drm] Wrong MCH_SSKPD value: 0x16040307 [drm] This can cause pipe underruns and display issues. [drm] Please upgrade your BIOS to fix this.

These messages can be seen for every kernel that's still in the logs (the oldest is v3.11 based).

1) I'm not sure whether I actually run into "pipe underruns" or "display issues". Is there something specific I should look for?

2) Now it happens that this laptop already runs the latest BIOS. So, if I were to contact Lenovo to see if they could release a BIOS update to fix this, what should I ask them to do?

Paul Bolle