Public bug reported: Note that I'm really running Mint 17.3; but I don't believe they change the kernel packages, so this is still relevant here.
When an external screen is connected through the dock (both displayport and displayport-to-dvi, on different docks), I get a message during startup that the X server has not found any screens. Simply turning the screen off (not even disconnecting it) lets the system boot into the single laptop screen as per normal. When I turn on (or reconnect) the screen, it isn't recognised, and not even seen as far as syslog is concerned. When not docked, the onboard displayport connection works as normal. Yesterday everything was normal, the only relevant upgrade that happened was from kernel 3.16.0-38.52 to 3.19.0-32.37. I've rebooted into the previous kernel, and that works normally - so I suspect a regression in the i915 driver or similar? I'm also noticing these lines in there, that aren't shown with the old kernel: [ 8.553727] [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master control interrupt lied (SDE)! Kernel 3.19 loads i915_bpo and spews the above errors; kernel 3.16 uses i915 and does not. I cannot rmmod i915_bpo as it is in use even when no X is active; and simply loading i915 on top does not help. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.19.0-32-generic 3.19.0-32.37~14.04.1 ProcVersionSignature: Ubuntu 3.19.0-32.37~14.04.1-generic 3.19.8-ckt7 Uname: Linux 3.19.0-32-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.19 Architecture: amd64 Date: Wed Jan 13 11:04:01 2016 InstallationDate: Installed on 2015-09-22 (112 days ago) InstallationMedia: Linux Mint 17.2 "Rafaela" - Release amd64 20150723 SourcePackage: linux-lts-vivid UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: linux-lts-vivid (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug rosa third-party-packages -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-lts-vivid in Ubuntu. https://bugs.launchpad.net/bugs/1533590 Title: X recognises no screens when external connected Status in linux-lts-vivid package in Ubuntu: New Bug description: Note that I'm really running Mint 17.3; but I don't believe they change the kernel packages, so this is still relevant here. When an external screen is connected through the dock (both displayport and displayport-to-dvi, on different docks), I get a message during startup that the X server has not found any screens. Simply turning the screen off (not even disconnecting it) lets the system boot into the single laptop screen as per normal. When I turn on (or reconnect) the screen, it isn't recognised, and not even seen as far as syslog is concerned. When not docked, the onboard displayport connection works as normal. Yesterday everything was normal, the only relevant upgrade that happened was from kernel 3.16.0-38.52 to 3.19.0-32.37. I've rebooted into the previous kernel, and that works normally - so I suspect a regression in the i915 driver or similar? I'm also noticing these lines in there, that aren't shown with the old kernel: [ 8.553727] [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master control interrupt lied (SDE)! Kernel 3.19 loads i915_bpo and spews the above errors; kernel 3.16 uses i915 and does not. I cannot rmmod i915_bpo as it is in use even when no X is active; and simply loading i915 on top does not help. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.19.0-32-generic 3.19.0-32.37~14.04.1 ProcVersionSignature: Ubuntu 3.19.0-32.37~14.04.1-generic 3.19.8-ckt7 Uname: Linux 3.19.0-32-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.19 Architecture: amd64 Date: Wed Jan 13 11:04:01 2016 InstallationDate: Installed on 2015-09-22 (112 days ago) InstallationMedia: Linux Mint 17.2 "Rafaela" - Release amd64 20150723 SourcePackage: linux-lts-vivid UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-vivid/+bug/1533590/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp