sorry, I slackened for the last months, hoping someone would see this bug, 
upstream. They didn't. I filed it yesterday.
Finally, I hope somebody sees it and starts working on it. Fingers crossed.

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  Disappearing screen and flickering after upgrade to 16.04

Status in linux package in Ubuntu:

Bug description:
  I have two Lenovo T410s that I upgraded from 14.04 to 16.04.
  Since then, one is working fine while the other shows mainly an ever 
disappearing screen and flickering.

  I have asked here:
  I also found I am not the only one:
  The latter has tried pretty much that could be tried already, to no avail.

  I think that I can help with this problem, since my two T410s are
  identical in hard- and software, including BIOS, except that one is a
  type 2924 (with NVIDIA-card, though disabled in the BIOS), and the
  other one is a 2904 (without NVIDIA card).

  I have checked for differences at boot time and found DMAR as major 
  T410s, 2924: [ 0.335616] DMAR: Disabling batched IOTLB flush on Ironlake
  T410s, 2904: [ 0.355681] DMAR: BIOS has allocated no shadow GTT; disabling 
IOMMU for graphics 

  Should this be initially at the root of the problem, I'd consider the
  kernel package as responsible, therefore I marked it as above.

  The outputs of lspci -k | grep -EA3 'VGA|3D|Display' are identical to
  the point.

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