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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1712508
Title:
Disappearing screen and flickering after upgrade to 16.04
Status in linux package in Ubuntu:
Incomplete
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:
https://askubuntu.com/questions/947233/i-upgraded-from-kubuntu-14-04-lts-to-16-04-lts-and-now-my-screen-shows-up-and-di?noredirect=1#comment1506995_947233
I also found I am not the only one:
https://askubuntu.com/questions/927407/flickering-screen-with-intel-graphics-on-ubuntu-17-04?noredirect=1#comment1507937_927407
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
difference:
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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