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** Changed in: xorg (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1606122
Title:
Cairo drawing coordinates are broken w/nouveau (affects xfwm4)
Status in xorg package in Ubuntu:
Incomplete
Bug description:
I'm using xfwm4 with Xubuntu 16.04. With compositing enabled, and
when I cycle through windows with Alt-Tab, xfwm4 draws an opaque
rectangle bordering a candidate window, and it fills that rectangle
with a semi-transparent blue color. When I use the nouveau driver,
the filled rectangle is clipped. The problem does not reproduce with
the proprietary nvidia driver.
It seems as though a drawing command should be issued using a window-
relative coordinate, but sometimes is instead issued using a screen-
relative coordinate.
I extracted relevant bits of xfwm4 into a small test program that
reproduces the problem. The test program creates a transparent
XWindow at (100,100) with size (210,210). It draws six rectangles
centered inside the window of varying parameters. Two of them are
drawn at the wrong place.
xfwm4 should be off-the-hook, I think, unless it's doing something
wrong (e.g. unspecified/undefined behavior).
$ lsb_release -rd
Description: Ubuntu 16.04.1 LTS
Release: 16.04
$ apt-cache policy xserver-xorg-video-nouveau
xserver-xorg-video-nouveau:
Installed: 1:1.0.12-1build2
Candidate: 1:1.0.12-1build2
Version table:
*** 1:1.0.12-1build2 500
500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
100 /var/lib/dpkg/status
$ apt-cache policy xfwm4
xfwm4:
Installed: 4.12.3-1ubuntu2
Candidate: 4.12.3-1ubuntu2
Version table:
*** 4.12.3-1ubuntu2 500
500 http://us.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
100 /var/lib/dpkg/status
I created a video demonstrating the problem in xfwm4:
https://www.youtube.com/watch?v=8dZN80tMA6M. If you look closely, you
can see that the opaque blue border is positioned correctly, while the
semi-transparent overlay isn't.
FWIW, I'm using an NVIDIA GeForce GTX 750 Ti card.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: XFCE
Date: Mon Jul 25 00:50:21 2016
InstallationDate: Installed on 2016-07-19 (6 days ago)
InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64
(20160420.1)
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
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