NMGLugers, I've been working on a Lenovo G570 with no luck at accurately diagnosing the cause of the screen going snowy white from time to time.I do have some interesting dmesg data: [ 3801.052632] perf: interrupt took too long (2511 > 2500), lowering kernel.perf_event_max_sample_rate to 79500 [ 4854.434600] perf: interrupt took too long (3172 > 3138), lowering kernel.perf_event_max_sample_rate to 63000 [ 6331.178797] perf: interrupt took too long (3978 > 3965), lowering kernel.perf_event_max_sample_rate to 50250 [ 8761.400542] perf: interrupt took too long (4978 > 4972), lowering kernel.perf_event_max_sample_rate to 40000 Another day: [ 1140.327578] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A [ 1140.327612] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun [ 2738.169609] perf: interrupt took too long (2540 > 2500), lowering kernel.perf_event_max_sample_rate to 78500 [ 3508.016823] perf: interrupt took too long (3226 > 3175), lowering kernel.perf_event_max_sample_rate to 62000 [ 4803.061071] perf: interrupt took too long (4049 > 4032), lowering kernel.perf_event_max_sample_rate to 49250 [ 6866.952654] perf: interrupt took too long (5089 > 5061), lowering kernel.perf_event_max_sample_rate to 39250 So, I will bring the unit to our GLUG meeting - barring a terrific snowstorm- and see if we can determine whether this is hardware or software. I am reluctant to expend any money without knowing what to fix. For now I close the the lid to restart the display and I can work for longer and longer periods without an issue. Web searches have been fruitless diversions. Thank you, Ted P.