Public bug reported: It seems that recent versions of Ubuntu (16.04) has a bug in handling extended HDMI monitors. The HDMI monitor has up to 1980x1080 resolution, my laptop has up to 1366x768 resolution. Both screens have native 16:9 ratio. However, in "mirrored display" mode, I can only select 1024x768 and 800x600 resolution as shown in the image attached.
In such mode, my laptop screen has two blank strip on the left and right side. On the HDMI monitor, it shows a squashed screen (1024x768 resolution stretched to 16:9 full screen). I have temporarily developed a workaround, see https://xuancong84.blogspot.sg/2018/05/ubuntu-hdmi-extended-monitor- low.html , but I still hope the bug can be solved. Thank you very much! ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: xorg 1:7.7+13ubuntu3 ProcVersionSignature: Ubuntu 4.15.0-15.16~16.04.1-generic 4.15.15 Uname: Linux 4.15.0-15-generic x86_64 .tmp.unity_support_test.0: ApportVersion: 2.20.1-0ubuntu2.16 Architecture: amd64 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: Tue May 8 22:21:37 2018 DistUpgraded: Fresh install DistroCodename: xenial DistroVariant: ubuntu DkmsStatus: bcmwl, 6.30.223.271+bdcom, 4.10.0-28-generic, x86_64: installed ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation Device [8086:5916] (rev 02) (prog-if 00 [VGA controller]) Subsystem: Dell Device [1028:07a0] InstallationDate: Installed on 2018-03-09 (59 days ago) InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 003: ID 1bcf:2b96 Sunplus Innovation Technology Inc. Bus 001 Device 002: ID 17ef:6025 Lenovo ThinkPad Travel Mouse Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Dell Inc. Latitude 7480 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-15-generic root=UUID=3f217eea-d2a7-4c61-9f9a-0a111e2e3cdf ro quiet splash intel_pstate=disable vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/09/2018 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.9.3 dmi.board.name: 00F6D3 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.9.3:bd03/09/2018:svnDellInc.:pnLatitude7480:pvr:rvnDellInc.:rn00F6D3:rvrA00:cvnDellInc.:ct10:cvr: dmi.product.family: Latitude dmi.product.name: Latitude 7480 dmi.sys.vendor: Dell Inc. version.compiz: compiz 1:0.9.12.3+16.04.20180221-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.83-1~16.04.1 version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.8-0ubuntu0~16.04.1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.8-0ubuntu0~16.04.1 version.xserver-xorg-core: xserver-xorg-core N/A version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A ** Affects: xorg (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug compiz-0.9 resolution ubuntu xenial ** Attachment added: "bug screenshot" https://bugs.launchpad.net/bugs/1769907/+attachment/5136129/+files/bug.jpg -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1769907 Title: HDMI extended monitor has very low resolution in mirrored display mode To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1769907/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
