This issue initially happened on both intel and nvidia gpus after 16.04 was released but the bug was fixed for intel gpus at some point but remains for nvidia on 352 and 340 drivers.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1534964 Title: Hotplugging HDMI fails Status in xorg package in Ubuntu: Invalid Bug description: Affected computer: Dell Precision 15 5000 Series (5510) with Quadro M1000M/PCIe/SSE2 graphics card (kernel 4.2.0-23-generic). Expected behaviour: - hotplugging HDMI cable would work Current behaviour: - Hotpluging doesn't work (no kernel events, used udevadm monitor to verify) Current observations: - HDMI output works if connected from the boot - When DPMS kicks in HDMI output disappears (tested with 2 different monitors) - Hotpluging doesn't work (no kernel events, used udevadm monitor to verify) - VGA (via usb-c adapter) works, hotplugging also - HDMI (via usb-c adapter) causes black screen in computer display and eventually crashes X. Unplugging adapter before crash restores state (computer display restored) - display port (via usb-c adapter) not confirmed ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: xorg 1:7.7+7ubuntu4 ProcVersionSignature: Ubuntu 4.2.0-23.28-generic 4.2.6 Uname: Linux 4.2.0-23-generic x86_64 NonfreeKernelModules: nvidia .proc.driver.nvidia.registry: Binary: "" .proc.driver.nvidia.version: NVRM version: NVIDIA UNIX x86_64 Kernel Module 352.63 Sat Nov 7 21:25:42 PST 2015 GCC version: gcc version 5.2.1 20151010 (Ubuntu 5.2.1-22ubuntu2) ApportVersion: 2.19.1-0ubuntu5 Architecture: amd64 CurrentDesktop: Unity Date: Sat Jan 16 19:13:22 2016 DistUpgraded: Fresh install DistroCodename: wily DistroVariant: ubuntu DkmsStatus: bbswitch, 0.7, 4.2.0-23-generic, x86_64: installed nvidia-352, 352.63, 4.2.0-23-generic, x86_64: installed EcryptfsInUse: Yes GraphicsCard: Intel Corporation Device [8086:191d] (rev 06) (prog-if 00 [VGA controller]) Subsystem: Dell Device [1028:06e5] Subsystem: Dell Device [1028:06e5] InstallationDate: Installed on 2016-01-11 (4 days ago) InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 003: ID 04f3:21d5 Elan Microelectronics Corp. Bus 001 Device 007: ID 8087:0a2b Intel Corp. Bus 001 Device 004: ID 0c45:6713 Microdia Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Dell Inc. Precision 5510 ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-23-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro noprompt quiet splash vt.handoff=7 SourcePackage: xorg UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev' UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/18/2015 dmi.bios.vendor: Dell Inc. dmi.bios.version: 01.01.15 dmi.board.name: 08R8KJ dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr01.01.15:bd12/18/2015:svnDellInc.:pnPrecision5510:pvr:rvnDellInc.:rn08R8KJ:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Precision 5510 dmi.sys.vendor: Dell Inc. version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.64-1 version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4 version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1534964/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp