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Eliminate long IOP cycles on front-ends with AST VGA chips

Keith Thorne requested to merge keith-thorne/advligorts:branch-longiopcyclefix into master

Close #12 (closed) Add Debian-specific kernel 4.19 config file (config-4.19.67-cs) Disable CONFIG_DRM_AST flag so kernel uses 'nomodeset' on AST VGA chips which prevents interrupts causing long IOP cycles on newer front-ends (and removes need for nomodeset as kernel boot parameter) Update README in patches/linux-4.19-cs for these changes

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