Changes
CRTC
,/* VCC (C4) overflow */
* if this update was done when VCC = R4, the decision was already made to switch to vertical adjust mode and no update to R4 will make the CRTC change its mind for the current frame
The only exception when VCC = R4 is for CRTC 1 with a value of 0 when VCC = R4, which will cause the VCC to overflow.
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