[Kernel-packages] [Bug 1727662] Re: [Lenovo ThinkPad T450s] Issues after docking and locking: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

Hi Alexander. Thanks for your bug report and all your effort to troubleshoot and fix this weird issue. I'm not using any docking station but I'm experiencing the same behaviour (screen flickering and unable to lock my screen) here on a Lenovo T450s with a Intel HD Graphics 5500 (Broadwell GT2) G

[Kernel-packages] [Bug 1550779] Re: [i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches

Same issue here on a Lenovo T450s with a Intel HD Graphics 5500 (Broadwell GT2) GPU. It happens both with Ubuntu 16.04 and Fedora (26 and 27) so I suppose that's a weird bug in the intel driver. It also happens sometimes without any external monitor when I leave my notebook powered up during the