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 Ubuntu-X, 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1585687/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
