[Bug 1715586] [NEW] Fix shrinking behavior in rrCheckPixmapBounding

Launchpad Bug Tracker 1715586 at bugs.launchpad.net
Thu Sep 7 12:23:22 UTC 2017


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[Impact]
When using extended mode on an slave-output connected external monitor, RRSetCrtc calls rrCheckPixmapBounding, which shrinks the output area. It makes the slave-output configured to scan-out an area which completely falls outside of the screen-pixmap, and end up with
a black display on the external monitor.

We need these two commits:
a46afee84d45fbff4e4dad9376afc95bbcc31d7c randr: rrCheckPixmapBounding: do not shrink the screen_pixmap
3b624aa9a9df86dc7d48149e0f18ca223b4355f1 randr: rrCheckPixmapBounding: Do not substract crtc non 0 x,y from screen size

[Test Case]
Enable NVIDIA PRIME, plug an external monitor, and change to extended mode.

[Regression Potential]
There should be none, the shrinking behavior wasn't right at the first place.

** Affects: hwe-next
     Importance: Undecided
         Status: New

** Affects: xorg-server (Ubuntu)
     Importance: Critical
     Assignee: Kai-Heng Feng (kaihengfeng)
         Status: Confirmed


** Tags: originate-from-1704921 patch somerville
-- 
Fix shrinking behavior in rrCheckPixmapBounding
https://bugs.launchpad.net/bugs/1715586
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