Not sure if this is related. In 'dmesg -w' I see [15788.902724] [drm:intel_cpu_fifo_underrun_irq_handler [i915_bpo]] *ERROR* CPU pipe A FIFO underrun
The first time the mouse cursor enters the laptop display and the screen blanks. The message does not re-appear upon further mouse enter and exit. When I click All Settings -> Displays -> Apply (without changing any options), the following appears in dmesg [15830.032731] usb 1-5: USB disconnect, device number 25 [15831.090254] usb 1-5: new full-speed USB device number 26 using xhci_hcd [15831.152466] [drm:intel_dp_link_training_clock_recovery [i915_bpo]] *ERROR* failed to enable link training [15831.161070] [drm:intel_dp_start_link_train [i915_bpo]] *ERROR* failed to start channel equalization [15831.181674] [drm:intel_cpu_fifo_underrun_irq_handler [i915_bpo]] *ERROR* CPU pipe B FIFO underrun [15831.219948] usb 1-5: New USB device found, idVendor=2a94, idProduct=53e1 [15831.219957] usb 1-5: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [15831.219961] usb 1-5: Product: Multi-Touch by G2TSP [15831.219965] usb 1-5: Manufacturer: G2Touch [15831.224117] input: G2Touch Multi-Touch by G2TSP as /devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.0/0003:2A94:53E1.002E/input/input36 [15831.278552] hid-multitouch 0003:2A94:53E1.002E: input,hidraw4: USB HID v1.11 Device [G2Touch Multi-Touch by G2TSP] on usb-0000:00:14.0-5/input0 [15831.279665] hid-generic 0003:2A94:53E1.002F: hiddev0,hidraw5: USB HID v1.11 Device [G2Touch Multi-Touch by G2TSP] on usb-0000:00:14.0-5/input1 [15831.304466] [drm:intel_cpu_fifo_underrun_irq_handler [i915_bpo]] *ERROR* CPU pipe A FIFO underrun -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1585687 Title: Screen blanks with dual 4k displays when cursor enters built-in display Status in xorg package in Ubuntu: Incomplete Bug description: I'm not sure where to look for more information, but happy to debug further. I find that when both 4k displays are active, when the mouse cursor is within the external monitor area, both displays are on. When the mouse cursor enters the laptop's display screen area, the laptop screen either blanks or turns off (not sure which). ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: xorg 1:7.7+13ubuntu3 ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8 Uname: Linux 4.4.0-22-generic x86_64 .tmp.unity_support_test.0: ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 BootLog: CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true CurrentDesktop: Unity Date: Wed May 25 10:37:41 2016 DistUpgraded: Fresh install DistroCodename: xenial DistroVariant: ubuntu ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation Skylake Integrated Graphics [8086:191b] (rev 06) (prog-if 00 [VGA controller]) Subsystem: Samsung Electronics Co Ltd Skylake Integrated Graphics [144d:c12b] Subsystem: Samsung Electronics Co Ltd GM107M [GeForce GTX 950M] [144d:c12b] InstallationDate: Installed on 2015-12-22 (154 days ago) InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021) MachineType: SAMSUNG ELECTRONICS CO., LTD. 940Z5L ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic.efi.signed root=UUID=24c27814-5135-4a80-9ce1-b932e2513949 ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/11/2016 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P06AFC.091.160311.SH dmi.board.asset.tag: No Asset Tag dmi.board.name: NP940Z5L-X01US dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.board.version: SGL8554A1H-C01-G001-S0001+10.0.10240 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.chassis.version: N/A dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP06AFC.091.160311.SH:bd03/11/2016:svnSAMSUNGELECTRONICSCO.,LTD.:pn940Z5L:pvrP06AFC:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP940Z5L-X01US:rvrSGL8554A1H-C01-G001-S0001+10.0.10240:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A: dmi.product.name: 940Z5L dmi.product.version: P06AFC dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. version.compiz: compiz 1:0.9.12.2+16.04.20160415-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.67-1 version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2 version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2 xserver.bootTime: Wed May 25 09:50:07 2016 xserver.configfile: default xserver.errors: Failed to load module "nvidia" (module does not exist, 0) Failed to load module "nvidia" (module does not exist, 0) Unknown chipset: NV117 xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 16714 vendor SDC xserver.version: 2:1.18.3-1ubuntu2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1585687/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
