I have the same setup as @ritterkeks in comment #10, and the same issues. The P50 dock and it's DisplayPort hub is apparently the problem. The mini-DP connector on the laptop itself is working much better (I'm also seeing some OpenGL bugs there on my Lenovo P27 4K monitor (had to enable triple buffering), but that's apparently something else.
When I connect the monitor to either dock's DP ports the monitor's power led goes green like it's receiveng some signal, bit then goes amber into a power safe more. In the meantime the builtin monitor does pretty much the same, except it also shows some picture for a fraction of a second. This repeats sometimes forever (till I time out and pull the monitor's DP cable from the dock), or sometimes the xserver gives up and falls back to the builtin screen itself. It happenede that it was sometimes successful and I saw a proper picture on both screens, but that was far from stable/usable. After a bit of desperate searching I've fould that the dock itself has an upgradable firmware. The current latest version is 2.33. After jumping through hoops of installing windows (thanks a ton, Lenovo) I've managed to flash the dock. To my surprise, the monitor adoption got worse and since then, I can't ever see any picture on the 4K monitor via the dock at all (but compared to the previous unusable state it's really no big deal). With Windows it works fine, though, so I'm sure the firmware upgrade didn't really brick it. For those who want to try flashing the dock too 3:), you can find the binary here: https://support.lenovo.com/us/en/accessories/B697B003-94C2-418E-914F-23C201052DB1 Note the flashing utility is itself a "brilliant masterpiece" and most of the time it does nothing after you run it. At least apparently, but it does produce an "update.txt" file in the CWD, which you can examine for a status message. Also be sure to connect something to the dock when flashing it, as otherwise the utility shows it can't connect and bails out. So much facepalm. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nvidia-graphics-drivers-361 in Ubuntu. https://bugs.launchpad.net/bugs/1615734 Title: Multiple monitors broken Status in nvidia-graphics-drivers-361 package in Ubuntu: Confirmed Status in nvidia-graphics-drivers-367 package in Ubuntu: Confirmed Status in nvidia-graphics-drivers-375 package in Ubuntu: Confirmed Bug description: I have a Lenovo P50 with Nvidia Optimus (Quadro M1000M), installed with Ubuntu 16.04 and the recommended Nvidia drivers (361.42). I added two external monitors connected to DP sockets in the docking station. I would like to have display shift to those two monitors when the laptop is docked. One monitor has native resolution of 1680x1050 and the other is 1920x1080. The laptop native resolution is 1920x1080. Expected result: laptop monitor shut off, two external monitors running in native resolution, display shared on both monitors (not mirrored). Process: I configured the display using the "Displays" applet in the unity control center. However, pressing "Apply" when changing a specific display setting (such as resolution, location of screen relative to others, turning on/off), results in a long period of darkness, usually followed by display falling back to mirroring of all 3 monitors, using a similar-size screen (either low on all or high on all with the low-res monitor using panning). The applet remains frozen for some time, with the dialog "Is the display ok" open but unresponsive. Later I realized this is because there is another dialog of "Cannot set screen CRTCXXX" hidden under the two above windows, which needs to by ok-ed first. Extra: I also tried setting the display manually with 'xrandr', which lead to a similar result as above - with the "cannot set screen" dialog, and falling back to mirroring. This convinced me that the problem is probably with the nvidia driver and not the higher plumbing. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: nvidia-361 361.42-0ubuntu2 ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15 Uname: Linux 4.4.0-34-generic x86_64 NonfreeKernelModules: symap_custom_dkms_x86_64 nvidia_uvm nvidia_modeset nvidia ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 CurrentDesktop: Unity Date: Mon Aug 22 19:14:55 2016 InstallationDate: Installed on 2016-07-17 (36 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) SourcePackage: nvidia-graphics-drivers-361 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-361/+bug/1615734/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
