dist-upgrading to xorg-server (source package) 2:1.18.3-1ubuntu1 (binary packages xserver-common, xserver-xorg-core, xvfb) introduces a regression for Alt-backtick switching between windows of the same application. Before the upgrade, Alt-backtick works by showing you the switcher and letting you cycle between multiple windows of the same application. After the upgrade, Alt-backtick does nothing.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-17.33-generic 4.4.6
Uname: Linux 4.4.0-17-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
NVRM version: NVIDIA UNIX x86_64 Kernel Module 361.42 Tue Mar 22 18:10:58 PDT 2016
GCC version: gcc version 5.3.1 20160405 (Ubuntu 5.3.1-13ubuntu4)
ApportVersion: 2.20.1-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Apr 6 09:52:54 2016
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
DkmsStatus:
bbswitch, 0.8, 4.4.0-16-generic, x86_64: installed
bbswitch, 0.8, 4.4.0-17-generic, x86_64: installed
nvidia-361, 361.42, 4.4.0-16-generic, x86_64: installed
nvidia-361, 361.42, 4.4.0-17-generic, x86_64: installed
EcryptfsInUse: Yes
GraphicsCard:
NVIDIA Corporation GK104 [GeForce GTX 760] [10de:1187] (rev a1) (prog-if 00 [VGA controller])
Subsystem: Gigabyte Technology Co., Ltd GK104 [GeForce GTX 760] [1458:360b]
InstallationDate: Installed on 2016-01-22 (75 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160117)
MachineType: Gigabyte Technology Co., Ltd. Z170X-UD5
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-17-generic root=UUID=d03718f1-9983-4b07-a942-1b42fe8352ec ro
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/24/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F2
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: Z170X-UD5-CF
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF2:bd07/24/2015:svnGigabyteTechnologyCo.,Ltd.:pnZ170X-UD5:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnZ170X-UD5-CF:rvrx.x:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: Z170X-UD5
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz 1:0.9.12.2+16.04.20160331-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.2-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.2-1ubuntu2
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1ubuntu2
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: Wed Apr 6 09:09:25 2016
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
xserver.version: 2:1.18.3-1ubuntu1
I narrowed this down by doing a bisect dist-upgrade with disk snapshots. I.e. take a snapshot, manually upgrade a few packages, reboot, test, rinse, repeat. The only packages left are the three binary packages mentioned in the bug report. With the snapshot before upgrading those packages, Alt-backtick works. I've verified that after upgrading just these three, the regression occurs.