Public bug reported: I have monitor LG 43UD79-B and xrandr cannot correctly detect the dimensions of the monitor:
$ xrandr Screen 0: minimum 8 x 8, current 3840 x 2160, maximum 32767 x 32767 DVI-D-0 disconnected (normal left inverted right x axis y axis) HDMI-0 disconnected (normal left inverted right x axis y axis) HDMI-1 disconnected (normal left inverted right x axis y axis) DP-0 disconnected (normal left inverted right x axis y axis) DP-1 disconnected (normal left inverted right x axis y axis) DP-2 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 600mm x 340mm 3840x2160 60.00*+ 30.00 2560x1440 59.95 1920x1080 60.00 59.94 1600x900 60.00 1280x1024 60.02 1280x800 59.81 1280x720 60.00 59.94 1152x864 59.96 1024x768 60.00 800x600 60.32 720x480 59.94 640x480 59.94 59.93 DP-3 disconnected (normal left inverted right x axis y axis) According to the LG spec (https://www.lg.com/us/monitors/lg-43UD79-B-4k- uhd-led-monitor) the monitor pixel pitch is 0.2451 x 0.2451 mm so the actual panel size should be 941.184 x 529.416 mm instead of reported "600mm x 340mm". The monitor is connected via Nvidia GTX 1060 (6 GB) in case it makes a difference. Also, this monitor has BGR subpixel structure and it seems that every application will incorrectly default to RGB subpixel structure. I'm not sure if this information is supposed to be available via xrandr. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: x11-xserver-utils 7.7+7 ProcVersionSignature: Ubuntu 4.15.0-51.55~16.04.1-lowlatency 4.15.18 Uname: Linux 4.15.0-51-lowlatency x86_64 NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia .proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0000:01:00.0' .proc.driver.nvidia.registry: Binary: "" .proc.driver.nvidia.version: NVRM version: NVIDIA UNIX x86_64 Kernel Module 384.130 Wed Mar 21 03:37:26 PDT 2018 GCC version: gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.11) .proc.driver.nvidia.warnings.fbdev: Your system is not currently configured to drive a VGA console on the primary VGA device. The NVIDIA Linux graphics driver requires the use of a text-mode VGA console. Use of other console drivers including, but not limited to, vesafb, may result in corruption and stability problems, and is not supported. .tmp.unity_support_test.0: ApportVersion: 2.20.1-0ubuntu2.18 Architecture: amd64 BootLog: CompizPlugins: [core,composite,opengl,compiztoolbox,decor,regex,mousepoll,move,resize,imgpng,wall,animation,grid,fade,place,vpswitch,gnomecompat,session,workarounds,expo,scale,ezoom] CompositorRunning: None CurrentDesktop: MATE Date: Wed Jun 26 10:06:35 2019 DistUpgraded: 2016-06-10 11:06:21,514 WARNING no activity on terminal for 300 seconds (Applying changes) DistroCodename: xenial DistroVariant: ubuntu DkmsStatus: bbswitch, 0.8, 4.15.0-50-lowlatency, x86_64: installed bbswitch, 0.8, 4.15.0-51-lowlatency, x86_64: installed nvidia-384, 384.130, 4.15.0-50-lowlatency, x86_64: installed nvidia-384, 384.130, 4.15.0-51-lowlatency, x86_64: installed GraphicsCard: NVIDIA Corporation GP106 [GeForce GTX 1060 6GB] [10de:1c03] (rev a1) (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Device [1043:865b] InstallationDate: Installed on 2015-02-23 (1583 days ago) InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1) MachineType: System manufacturer System Product Name ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-51-lowlatency root=UUID=254cacdb-f61b-45a6-9885-37afd2b598ce ro libata.noacpi=1 quiet splash vt.handoff=7 SourcePackage: x11-xserver-utils UpgradeStatus: Upgraded to xenial on 2016-06-10 (1110 days ago) dmi.bios.date: 02/04/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1101 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: P8H77-M PRO dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev X.0x dmi.chassis.asset.tag: Asset-1234567890 dmi.chassis.type: 3 dmi.chassis.vendor: Chassis Manufacture dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1101:bd02/04/2013:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8H77-MPRO:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.family: To be filled by O.E.M. dmi.product.name: System Product Name dmi.product.version: System Version dmi.sys.vendor: System manufacturer version.compiz: compiz 1:0.9.12.3+16.04.20180221-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.91-2~16.04.1 version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~16.04.1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~16.04.1 version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A 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 xserver.bootTime: Tue Jun 18 10:32:33 2019 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.outputs: xserver.version: 2:1.19.6-1ubuntu4.1~16.04.2 ** Affects: x11-xserver-utils (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug ubuntu xenial -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to x11-xserver-utils in Ubuntu. https://bugs.launchpad.net/bugs/1834290 Title: Incorrect physical size detected for LG 43UD79-B To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/x11-xserver-utils/+bug/1834290/+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
