Public bug reported: I installed Ubuntu 16.04.1 on my Dell XPS 13 9360 and I'm experiencing some issues with external displays.
I bought two adapters from Aukey: USB-C to VGA and USB-C to HDMI (USB-C is the only port that I can use for video output on my computer). USB-C to VGA work flawlessly with all display I tested. USB-C to HDMI has issues with some displays. Sound works great but with some displays (such as on 2 24" Samsung TV monitors) colors are rendered wrong, like if a 16-bit palette is used (this picture posted by another user gives an idea of the problem: https://i.stack.imgur.com/KY44f.jpg). If I connect the display BEFORE turning it on and then turn it on it works correctly (until any video setting option is changed... then I get weird colours again). When I get weird colours if I turn the monitor off and on I get correct colours (until a change in video mode options). However on some other displays it works correctly all the time, such as on a 40" Toshiba TV. Other users are reporting the same issues with other usb-c to hdmi adapters / monitors combinations. The same adapter/monitor combination works flawlessly with Windows 10, and previously I used the same monitor with Ubuntu on my old computer (that had HDMI output) with no problems. I tested some other distros with the same result, so I think it is a kernel-related bug. I tested latest 4.10 rc6 kernel but the problem is still there. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.8.0-34-generic 4.8.0-34.36~16.04.1 ProcVersionSignature: Ubuntu 4.8.0-34.36~16.04.1-generic 4.8.11 Uname: Linux 4.8.0-34-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.5 Architecture: amd64 CurrentDesktop: Unity Date: Sun Feb 5 17:39:55 2017 EcryptfsInUse: Yes InstallationDate: Installed on 2017-02-05 (0 days ago) InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) SourcePackage: linux-hwe-edge UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: linux-hwe-edge (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1661987 Title: Wrong colours on some monitors via USB-C to HDMI To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-edge/+bug/1661987/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
