Guessing this patch should fix it.
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Patch added: "refine_tmds_dual_link_checks.patch"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/915408/+attachment/2708796/+files/refine_tmds_dual_link_checks.patch
** Tags added: kernel-da-key kernel-handoff-graphics
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https://bugs.launchpad.net/bugs/915408
Title:
Garbled display on external screen when using 1920x1080 instead of
1920x1200
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