note: this is a follow-up to bug https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1533278
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1535123 Title: Touchscreen location incorrect after changing resolution using unity- control-center with dual-display setup Status in xorg package in Ubuntu: New Bug description: I have a touchscreen laptop with external display connected. Both support maximum resolution of 4k (3840x2160). The laptop screen is on the left, external display on the right. After initial boot from daily xenial live cd 2016-01-17, both screens are at the maximum resolution. When I touch the laptop screen, the cursor correctly shows my touch position. Using unity-control-center, when I set the resolution of the laptop display to 1920x1080, the screen blanks momentarily and apport reports that Ubuntu has experienced an internal error. The resolution reverts to 3820x2160 on both screens. I try again and the screen resolution changes properly. I submitted the report through apport several minutes ago, but I don't know how to link it here and I'm not sure it's related. After the resolution change, the laptop display on the left is 1920x1080 and the monitor display on the right is 3840x2160. Touches on the left are scaled to the entire width of the desktop, rather than under my finger. Reverting the resolution to 3840x2160 on both monitors through unity- control-center, the touches are still scaled to the whole desktop. In other words, touches on the right side of the laptop display register on the touchless monitor. When I log out, the touches are correct on the login screen. When I log back in as the ubuntu user with both resolutions at 3820x2160, the touch positions are correct. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: xorg 1:7.7+12ubuntu1 ProcVersionSignature: Ubuntu 4.3.0-5.16-generic 4.3.3 Uname: Linux 4.3.0-5-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.19.3-0ubuntu3 Architecture: amd64 CasperVersion: 1.366 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true CurrentDesktop: Unity Date: Sun Jan 17 20:12:52 2016 DistUpgraded: Fresh install DistroCodename: xenial DistroVariant: ubuntu ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation Device [8086:191b] (rev 06) (prog-if 00 [VGA controller]) Subsystem: Samsung Electronics Co Ltd Device [144d:c12b] Subsystem: Samsung Electronics Co Ltd Device [144d:c12b] LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160117) MachineType: SAMSUNG ELECTRONICS CO., LTD. 940Z5L ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/username.seed boot=casper quiet splash --- cdrom-detect/try-usb=true noprompt persistent SourcePackage: xorg Symptom: display UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev' UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 10/20/2015 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P04AFC.084.151020.SH dmi.board.asset.tag: No Asset Tag dmi.board.name: NP940Z5L-X01US dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.board.version: SGL8554A1H-C01-G001-S0001+10.0.10240 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.chassis.version: N/A dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP04AFC.084.151020.SH:bd10/20/2015:svnSAMSUNGELECTRONICSCO.,LTD.:pn940Z5L:pvrP04AFC:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP940Z5L-X01US:rvrSGL8554A1H-C01-G001-S0001+10.0.10240:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A: dmi.product.name: 940Z5L dmi.product.version: P04AFC dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. version.compiz: compiz 1:0.9.12.2+16.04.20151211-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.66-2 version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.8-1ubuntu1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.8-1ubuntu1 version.xserver-xorg-core: xserver-xorg-core 2:1.17.3-2ubuntu2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20151217-1~exp1ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3 xserver.bootTime: Sun Jan 17 20:10:41 2016 xserver.configfile: default xserver.errors: systemd-logind: failed to get session: PID 2978 does not belong to any known session xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 16714 vendor SDC xserver.version: 2:1.17.3-2ubuntu2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1535123/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp