Even more interesting...
I'm developing a small game in SDL.
It runs in a window, hides the cursor, and in every frame moves the cursor to
the center of the window.
But if I move the mouse fast enough for the cursor to exit the window, it is
shown for a split second and, more importantly, that black rectangle flashes in
the screen under the cursor.
So, this graphical glitch occurs when the mouse cursor is shown or
hidden!
This bug can be easily reproduced by following these steps:
1. Open a gnome-terminal
2. Move the mouse cursor to inside the window
3. Press and hold any letter in the keyboard, like 'A', to enter that letter
repeatedly into the terminal, which will also hide the mouse cursor
4. Start moving the mouse cursor, keeping it inside the window, and the problem
will manifest
This issue occurs also in a guest session and a live session (after I disable
the phantom 2nd monitor due to NVidia Optimus), so it's not because of any
change I made to the system.
And like I said above, I'm using a laptop with Nvidia Optimus (Nvidia driver
installed, Intel card selected).
I also just now tried reproducing this bug in GNOME Session Flashback, and I
managed to reproduce it both with Compiz and Metacity.
So, this issue isn't neither in Unity nor in Compiz! Maybe in X11.
Could a developer take a look into this issue?
I think there's enough info to go on now.
If you need more info, just ask.
** Also affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
** Changed in: compiz (Ubuntu)
Status: New => Invalid
** Changed in: unity (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1585329
Title:
Sometimes a black rectangle appears briefly under the mouse cursor
Status in compiz package in Ubuntu:
Invalid
Status in unity package in Ubuntu:
Invalid
Status in xorg-server package in Ubuntu:
New
Bug description:
I'm on 16.04, using a laptop with Nvidia Optimus (Nvidia driver installed,
Intel card selected).
The problem also occurs in a guest session.
It didn't occur in 14.04.
Sometimes I see a black rectangle appear for a very brief moment (a flash).
Horizontally, the rectangle occupies the whole screen.
Vertically, the rectangle seems to start in the mouse cursor and ends in the
bottom of the screen.
The easiest way to reproduce the bug is to open a Gnome terminal, move
the mouse cursor inside the window and press Alt+Backspace repeatedly.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: compiz 1:0.9.12.2+16.04.20160415-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
.tmp.unity_support_test.0:
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CompizPlugins:
[core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,staticswitcher,workarounds,scale,expo,ezoom,dbus]
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Tue May 24 19:44:19 2016
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
EcryptfsInUse: Yes
GraphicsCard:
Intel Corporation Core Processor Integrated Graphics Controller [8086:0046]
(rev 02) (prog-if 00 [VGA controller])
Subsystem: Acer Incorporated [ALI] Core Processor Integrated Graphics
Controller [1025:0488]
NVIDIA Corporation GF108M [GeForce GT 420M] [10de:0df1] (rev ff) (prog-if ff)
GsettingsChanges:
b'org.compiz.core' b'outputs' b"['1366x768+0+0']"
b'org.compiz.core' b'hsize' b'2'
b'org.compiz.core' b'active-plugins' b"['core', 'composite', 'opengl',
'compiztoolbox', 'imgpng', 'snap', 'titleinfo', 'grid', 'vpswitch', 'move',
'regex', 'copytex', 'place', 'mousepoll', 'session', 'commands', 'wall',
'resize', 'winrules', 'dbus', 'unitymtgrabhandles', 'animation', 'expo',
'ezoom', 'fade', 'workarounds', 'scale', 'unityshell']"
b'org.compiz.core' b'vsize' b'2'
b'org.compiz.core' b'focus-prevention-level' b'0'
InstallationDate: Installed on 2016-04-25 (28 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64
(20160420.1)
Lsusb:
Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 064e:a219 Suyin Corp. 1.3M WebCam (notebook emachines
E730, Acer sub-brand)
Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Acer Aspire 5742G
PackageArchitecture: all
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-22-generic
root=UUID=68a53fa4-4cfc-45bc-84de-762947ea37e1 ro locale=pt_PT quiet splash
SourcePackage: compiz
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/13/2012
dmi.bios.vendor: Acer
dmi.bios.version: V1.30
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Aspire 5742G
dmi.board.vendor: Acer
dmi.board.version: V1.30
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.30
dmi.modalias:
dmi:bvnAcer:bvrV1.30:bd08/13/2012:svnAcer:pnAspire5742G:pvrV1.30:rvnAcer:rnAspire5742G:rvrV1.30:cvnAcer:ct10:cvrV1.30:
dmi.product.name: Aspire 5742G
dmi.product.version: V1.30
dmi.sys.vendor: Acer
version.compiz: compiz 1:0.9.12.2+16.04.20160415-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20160325-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau
1:1.0.12-1build2
xserver.bootTime: Tue May 24 19:18:29 2016
xserver.configfile: default
xserver.errors:
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
product id 592
vendor LGD
xserver.version: 2:1.18.3-1ubuntu2
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