Yes this patch is in the mainline kernel v4.5-rc1-wily. But I think regarding our problem here it does only what it says: shut up the messages. I just tested it, got a
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun at boot time now (related: https://bugzilla.kernel.org/show_bug.cgi?id=95461), while the [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)! are gone. With external monitor connected things getting worse, gdm isn't able to use the monitor correctly and crashes from time to time. Looks like there are now other i915 bugs (maybe regression?) more urgent. Personally I will stick to 4.4 until I've got time to investigate this further with a clean install of ubuntu to eliminate the possibility that I'm looking at completely unrelated issues here. ** Bug watch added: Linux Kernel Bug Tracker #95461 http://bugzilla.kernel.org/show_bug.cgi?id=95461 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1488719 Title: dmesg shows "[drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!" Status in Linux: Confirmed Status in linux package in Ubuntu: Confirmed Bug description: On a recent intel NUC using i915 graphics, I get the following errors in dmesg: [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)! There are two monitors connected to this box, one with mini- HDMI->HDMI, one with mini-DP->HDMI cable. Maybe related: https://bugs.freedesktop.org/show_bug.cgi?id=80896 ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: linux-image-generic 3.19.0.26.25 ProcVersionSignature: Ubuntu 3.19.0-26.28-generic 3.19.8-ckt4 Uname: Linux 3.19.0-26-generic x86_64 ApportVersion: 2.17.2-0ubuntu1.3 Architecture: amd64 Date: Wed Aug 26 10:07:31 2015 InstallationDate: Installed on 2015-08-01 (24 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-26-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7 SourcePackage: linux UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev' UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1488719/+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
