Changes
CRTC
,/* Counter freezes */
On CRTCs 1/2/3/4, R0 accepts all values without causing any problems for counters.
On CRTC 0, setting R0 to 0 or 1 will cause some counters to freeze. The reason for the freezes relates to the logic of how and when the CRTC 0 triggers updates and resets of its various internal counters. Several operations, like the last line check and additional line management vertical adjustment activation, depend on HCC reaching certain values. When R0 is 0 or 1, HCC doesn't reach those values, preventing those operations from happening.
When R0=0:
