[SKL, i915_bpo] System hang when switching between extended/mirror modes
Bug #1493746 reported by
Timo Aaltonen
This bug affects 2 people
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Released
|
High
|
Unassigned | ||
Vivid |
Fix Released
|
Critical
|
Timo Aaltonen |
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 f015c5518879fb3
Author: Ville Syrjälä <email address hidden>
Date: Wed Jun 24 22:00:02 2015 +0300
drm/i915: Split atomic wm update to pre and post variants
--
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.
Related branches
Changed in linux (Ubuntu): | |
importance: | Undecided → High |
status: | New → In Progress |
Changed in linux (Ubuntu Vivid): | |
assignee: | nobody → Timo Aaltonen (tjaalton) |
importance: | Undecided → Critical |
status: | New → In Progress |
description: | updated |
Changed in linux (Ubuntu Vivid): | |
status: | In Progress → Fix Committed |
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Verified the kernel build with the said patch on multiple failed Intel SKL systems and it made display mode switching work reliably.