Thanks, I'll try weston-launch when I get a chance, and I'll try it on ubuntu 18.04 with intel graphics.
In the meantime, I checked the maximum size a few systems report, and it does seem to be a property of the graphics hardware and/or driver. See also http://webglstats.com/webgl2/parameter/MAX_TEXTURE_SIZE === + uname -a Linux rbb-ubu1604-6 4.4.0-128-generic #154-Ubuntu SMP Fri May 25 14:15:18 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux + grep maximum + xrandr Screen 0: minimum 8 x 8, current 3840 x 6480, maximum 32767 x 32767 + lspci + grep VGA 03:00.0 VGA compatible controller: NVIDIA Corporation Device 1c03 (rev a1) + glxinfo + grep string server glx vendor string: NVIDIA Corporation server glx version string: 1.4 client glx vendor string: NVIDIA Corporation client glx version string: 1.4 OpenGL vendor string: NVIDIA Corporation OpenGL renderer string: GeForce GTX 1060 6GB/PCIe/SSE2 OpenGL core profile version string: 4.5.0 NVIDIA 390.67 OpenGL core profile shading language version string: 4.50 NVIDIA OpenGL version string: 4.6.0 NVIDIA 390.67 OpenGL shading language version string: 4.60 NVIDIA OpenGL ES profile version string: OpenGL ES 3.2 NVIDIA 390.67 OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20 === + uname -a Linux rbb-ubu1804-5 4.17.0-999-generic #201806080237 SMP Fri Jun 8 06:41:11 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux + xrandr + grep maximum Screen 0: minimum 320 x 200, current 7680 x 2160, maximum 16384 x 16384 + lspci + grep VGA 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Vega [Radeon RX Vega M] (rev c0) + glxinfo + grep string server glx vendor string: SGI server glx version string: 1.4 client glx vendor string: Mesa Project and SGI client glx version string: 1.4 OpenGL vendor string: X.Org OpenGL renderer string: AMD VEGAM (DRM 3.26.0, 4.17.0-999-generic, LLVM 6.0.0) OpenGL core profile version string: 4.5 (Core Profile) Mesa 18.2.0-devel OpenGL core profile shading language version string: 4.50 OpenGL version string: 3.1 Mesa 18.2.0-devel OpenGL shading language version string: 1.40 OpenGL ES profile version string: OpenGL ES 3.1 Mesa 18.2.0-devel OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.10 === + uname -a Linux rbb-ubu1804-6 4.15.0-23-generic #25-Ubuntu SMP Wed May 23 18:02:16 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux + xrandr + grep maximum Screen 0: minimum 320 x 200, current 3840 x 6480, maximum 8192 x 8192 + lspci + grep VGA 00:02.0 VGA compatible controller: Intel Corporation Iris Pro Graphics 580 (rev 09) + glxinfo + grep string server glx vendor string: SGI server glx version string: 1.4 client glx vendor string: Mesa Project and SGI client glx version string: 1.4 OpenGL vendor string: Intel Open Source Technology Center OpenGL renderer string: Mesa DRI Intel(R) Iris Pro Graphics 580 (Skylake GT4e) OpenGL core profile version string: 4.5 (Core Profile) Mesa 18.0.0-rc5 OpenGL core profile shading language version string: 4.50 OpenGL version string: 3.0 Mesa 18.0.0-rc5 OpenGL shading language version string: 1.30 OpenGL ES profile version string: OpenGL ES 3.2 Mesa 18.0.0-rc5 OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1776260 Title: Can't use three monitors properly; "xrandr: screen cannot be larger than 8192x8192" Status in mutter package in Ubuntu: Incomplete Status in xorg-server package in Ubuntu: Incomplete Bug description: https://www.intel.com/content/www/us.../mini-pcs.html claims that the Skull Canyon ( NUC6i7KYK ) can handle three 4k displays, so I'm experimenting with a Skull Canyon running a fresh minimal Ubuntu 18.04. It works great when plugged into one 4k monitor (via any of the three ports: hdmi, mini-dp, or type c; all three show up in xrandr as DisplayPort). It even seems to work ok when I plug in two. Doesn't matter which two. When I plug in all three, and boot to normal graphical.target mode with the usual gdm greeter, one of the three screens does show gdm, and allows me to log in. But I can't seem to get all three screens active at the same time. Falling back to old school tools, I did 'sudo systemctl set-default multi-user.target' and rebooted. Logging in, creating a trivial .xinitrc, and doing 'startx' started the X server, and all three screens show the same output. So far so good. But trying to arrange them like this: $ xrandr --auto --output DP-2 --right-of DP-1 --output DP-3 --right-of DP-2 fails with xrandr: screen cannot be larger than 8192x8192 (desired size 11520x2160) Using --above instead of --right-of works, but that's not how the monitors are arranged. I tried creating /usr/share/X11/xorg.conf.d/85-screen.conf containing Section "Screen" Identifier "Default Screen" DefaultDepth 24 SubSection "Display" Virtual 11520 6480 EndSubSection EndSection and applied it by killing X and doing startx again, but that gave very strange results: the mouse showed up on two screens, but .xinit didn't seem to have taken effect, and the content on the screen was the same as before startx. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: xserver-xorg-core 2:1.19.6-1ubuntu4 ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17 Uname: Linux 4.15.0-22-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.2 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: None Date: Mon Jun 11 09:49:40 2018 DistUpgraded: Fresh install DistroCodename: bionic DistroVariant: ubuntu ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation Iris Pro Graphics 580 [8086:193b] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Intel Corporation Iris Pro Graphics 580 [8086:2064] InstallationDate: Installed on 2018-06-08 (2 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.15.0-22-generic root=UUID=80ac733c-b098-4643-84a4-fe81874f2101 ro rootflags=subvol=@ quiet splash vt.handoff=1 SourcePackage: xorg-server UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 06/03/2016 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: KYSKLi70.86A.0037.2016.0603.1032 dmi.board.name: NUC6i7KYB dmi.board.vendor: Intel Corporation dmi.board.version: H90766-404 dmi.chassis.type: 3 dmi.chassis.vendor: Intel Corporation dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrKYSKLi70.86A.0037.2016.0603.1032:bd06/03/2016:svn:pn:pvr:rvnIntelCorporation:rnNUC6i7KYB:rvrH90766-404:cvnIntelCorporation:ct3:cvr1.0: version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.91-2 version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1 version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1 version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1776260/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
