Thank you. As I mentioned, I spent an extraordinary amount of time on this. I did not provide an exhaustive list of all my attempts and will not do so now, but this included, though was not limited to:-
+ Trying at least three different HDMI cables (and I dare mention that the whole debate about 1.3 vs 1.4 actually refers to the devices; for cables there's only the official "high speed" category vs the rest based on their shielding and all wires being connected - these cables are passive and have no protocol-awareness, though this is an entirely separate debate) all of which provided higher resolution with a different input device. + Trying a different monitor. + Reading out the EDID info once via the Displayport cable and once via HDMI using get-edid and parse-edid, and also parsing the hex EDID info in the X log file (which was binary identical to what get-edid got). Interestingly, for the same monitor (but via different input ports) the EDID info differed in the maximum clock speed and the mode list, but in both cases included a (non-interlaced) mode at 2560x1440 pixels. The EDID info is stable - it is identical in repeated readouts (or X startup log files) for each of the connection modes. The monitor is not a cheapo TV but a brand new Asus PB328Q ( https://www.asus.com/Commercial-Monitors/PB328Q/). I have at present no other input devices that would be able to send 2560x1440 down the HDMI cable, so I cannot test that. I can, however, report, that with kernel 4.18, sometimes (rarely), upon restart, the X server initially starts with 1920x... (over HDMI), and sometimes 1289x..., but when I enter the display manager, it only offers the 1024x... mode, and actually forces the lower mode at that point, so there's clearly some inconsistency somewhere (and I am obviously not excluding this being in the intel HD 620 graphics hardware). Sometimes the startup mode is then even interlaced, to make matters even worse. In mention once more that there are *plenty* of reports out there on exactly this phenomenon of not getting the top resolution via HDMI with this (and some other) intel graphics hardware, also, but not only on official intel/windows support forums where official intel support staff keep recommending newer versions of the driver until, eventually, those customers suffering the problem find a version that works for them. All this may be caused by the intel (HDMI) hardware being flakey, show unreliable intermittent responses, etc., you name it, but merely reiterating suggestions that amount to this being simply extraneous or ultimately the users responsibility (or even fault) is not particularly helpful. This problem is widely reported! I mean obviously no offense. I am grateful for any genuine attempt to help and will try out the new kernel 4.19 asap (still away on business) and report back. Sincerely, pj On Mon, 1 Oct 2018, 10:01 Daniel van Vugt, <daniel.van.v...@canonical.com> wrote: > The hardware brochure says "HDMI 2.0 (3840x2160 @ 60Hz), HDCP compliant" on > > http://hkftp.zotac.com/External/ZBOX/C-series/CI547nano/Brochure/ZBOX-CI547NANO_Brochure.pdf > > So the only reasons I can think of for 2560x1440 (which requires only > HDMI 1.3) being rejected are: > > 1. Low quality HDMI cable. Make sure you use a cable that is advertised > as supporting 4K. HDMI 1.3 can do 4K at 30Hz and HDMI 2.0 can do 4K at > 60Hz. > > 2. A buggy TV/display returning bad EDID data. That's unlikely but > happens occasionally. > > -- > You received this bug notification because you are subscribed to the bug > report. > https://bugs.launchpad.net/bugs/1793837 > > Title: > xorg gives low resolution on HDMI port > > Status in linux package in Ubuntu: > Triaged > > Bug description: > This is a Zotac CI547 box. It has to video outputs: one HDMI and one > DisplayPort. The HDMI port appears as DP-1 in the logs, the > DisplayPort as DP-2. The hardware is Intel HD 620 and is allegedly > able to run two displays simultaneously at 4K. I have one WQHD monitor > (=2560x1440) and I get that full resolution over the DisplayPort. > However, I would like to also get that resolution over the HDMI port > (in order to connect two identical monitors), but over HDMI I only get > 1024x768. Updating the kernel to the latest 4.18.8 using UKUU made no > difference. > > ProblemType: Bug > DistroRelease: Ubuntu 18.04 > Package: xorg 1:7.7+19ubuntu7.1 > Uname: Linux 4.18.8-041808-generic x86_64 > ApportVersion: 2.20.9-0ubuntu7.3 > Architecture: amd64 > CompizPlugins: No value set for > `/apps/compiz-1/general/screen0/options/active_plugins' > CompositorRunning: None > CurrentDesktop: X-Cinnamon > Date: Sat Sep 22 00:21:15 2018 > DistUpgraded: Fresh install > DistroCodename: bionic > DistroVariant: ubuntu > ExtraDebuggingInterest: Yes > GraphicsCard: > Intel Corporation HD Graphics 620 [8086:5916] (rev 02) (prog-if 00 [VGA > controller]) > Subsystem: Intel Corporation HD Graphics 620 [8086:0000] > InstallationDate: Installed on 2018-09-19 (2 days ago) > InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 > (20180725) > MachineType: ZOTAC ZBOX-CI527/CI547 > ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.8-041808-generic > root=UUID=a3c0f54d-b5ae-4a0f-89ec-8e47ad34e2ef ro quiet splash > acpi_backlight=native pci=nomsi > resume=UUID=a3c0f54d-b5ae-4a0f-89ec-8e47ad34e2ef resume_offset=34816 > vt.handoff=1 > SourcePackage: xorg > Symptom: display > UpgradeStatus: No upgrade log present (probably fresh install) > dmi.bios.date: 04/25/2017 > dmi.bios.vendor: American Megatrends Inc. > dmi.bios.version: B331P206 > dmi.board.asset.tag: NA > dmi.board.name: ZBOX-CI527/CI547 > dmi.board.vendor: ZOTAC > dmi.board.version: XX > dmi.chassis.asset.tag: Default string > dmi.chassis.type: 9 > dmi.chassis.vendor: Default string > dmi.chassis.version: Default string > dmi.modalias: > dmi:bvnAmericanMegatrendsInc.:bvrB331P206:bd04/25/2017:svnZOTAC:pnZBOX-CI527/CI547:pvrXX:rvnZOTAC:rnZBOX-CI527/CI547:rvrXX:cvnDefaultstring:ct9:cvrDefaultstring: > dmi.product.family: NA > dmi.product.name: ZBOX-CI527/CI547 > dmi.product.sku: NA > dmi.product.version: XX > dmi.sys.vendor: ZOTAC > version.compiz: compiz N/A > version.libdrm2: libdrm2 2.4.91-2 > version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~18.04.1 > version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~18.04.1 > 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/linux/+bug/1793837/+subscriptions > -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1793837 Title: xorg gives low resolution on HDMI port To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1793837/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
