Yes it sounds/looks like a signalling frequency problem if not a cable fault.
Check out bug 1606103 where some frequency problems with the modesetting driver are being investigated. -- 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/1631643 Title: 1920x1080 HDMI output is corrupted in 16.04 Status in xorg-server package in Ubuntu: New Bug description: Ever since upgrading to 16.04 from 14.04 on my Lenovo x230 the HDMI output to a Benq W1070 is corrupted if run at 1920x1080 (native resolution). At 1280x720 the display looks fine. Looking at similar reports for other graphics cards it seems similar to cases when the frequency is too low. I've tested that the projector still works fine with the same cable and another computer. I've attached a photo of the kind of corruption that shows up on screen. It's mostly green/magenta pixels sprinkled across the screen. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: xorg 1:7.7+13ubuntu3 ProcVersionSignature: Ubuntu 4.4.0-38.57-generic 4.4.19 Uname: Linux 4.4.0-38-generic x86_64 .tmp.unity_support_test.0: ApportVersion: 2.20.1-0ubuntu2.1 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: Sat Oct 8 19:38:39 2016 DistUpgraded: 2016-08-07 01:11:54,340 DEBUG icon theme changed, re-reading DistroCodename: xenial DistroVariant: ubuntu DkmsStatus: virtualbox, 5.0.24, 4.4.0-31-generic, x86_64: installed virtualbox, 5.0.24, 4.4.0-38-generic, x86_64: installed ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Lenovo 3rd Gen Core processor Graphics Controller [17aa:21fa] InstallationDate: Installed on 2014-05-03 (889 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) MachineType: LENOVO 23252QG ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-38-generic root=UUID=9018e190-86bb-4fbf-a348-d47ea769640f ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: Upgraded to xenial on 2016-08-07 (62 days ago) dmi.bios.date: 05/24/2012 dmi.bios.vendor: LENOVO dmi.bios.version: G2ET31WW (1.11 ) dmi.board.asset.tag: Not Available dmi.board.name: 23252QG dmi.board.vendor: LENOVO dmi.board.version: Not Available dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvrG2ET31WW(1.11):bd05/24/2012:svnLENOVO:pn23252QG:pvrThinkPadX230:rvnLENOVO:rn23252QG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 23252QG dmi.product.version: ThinkPad X230 dmi.sys.vendor: LENOVO version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.2 version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2.2 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2.2 version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.1 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1.1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2 xserver.bootTime: Wed Oct 5 10:26:16 2016 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 728 vendor LGD xserver.version: 2:1.18.3-1ubuntu2.3 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1631643/+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
