04-13-2020, 01:19 PM
The cause is Intel (incomplete firmware). This is an old bug started with kernel 4.8, (4.7 seems to have been OK) but I can't find any mention of it being fixed in newer kernels other than the workaround you used (disabling the s-video port). Seems it is still there (reported at RHEL & Debian) at least up through kernel 4.15. There may or may not be a kernel fix coming at some point.
TC
TC
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