** Changed in: linux (Ubuntu Vivid)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1493746
Title:
[SKL, i915_bpo] System hang when switching between extended/mirror
modes
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Vivid:
Fix Committed
Bug description:
Switching between extended/mirror modes when an external monitor is
plugged in causes a system hang on at least some machines, like my
SKL-Y ultramobile test system. It needs a backport of an upstream
commit from 4.3, modified to work on 4.2-based i915_bpo:
commit f015c5518879fb3e578caaa63806617468a24045
Author: Ville Syrjälä <[email protected]>
Date: Wed Jun 24 22:00:02 2015 +0300
drm/i915: Split atomic wm update to pre and post variants
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the watermark stuff is Skylake-specific, so can't regress BSW/BDW.
This has been tested on a number of SKL machines now, fixing the bug.
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