Yikes, this does not look good... My old Mac Mini crashed just now. Didn't ever happen before the upgrade to LMDE 5.
Trace ends with
May 06 22:53:19 minnie kernel: nouveau 0000:02:00.0: fifo: channel 5 [Xorg] unload timeout
Somehow these newly acquired display problems seem inconsistent?
Sometimes I boot the machine and can work for hours with no problem. Sometimes I start a web browser and get display corruption within minutes (usually an area of the screen gets sort of an overlay with some coloured gemoetric shape when the web browser is rendering a page - or yesterday, just input field for image descriptions in Pinafore was being filled with sort of a colour gradient).
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