[rudrood]

I just made some test and found that the 23.976 is the only one that doesn't switch the tv oke with build 0515.
I played the files with variable fps that Milhouse posted some time ago.

Output of xrandr -q
   1920x1080     60.00*+  59.94    50.00    29.97    25.00    23.97    60.05    60.00    50.04
   1680x1050     ….etc

Results legacy driver:
23.976 - tv stays on default fps (60)
24 - tv stays on default fps (60)
25 - tv switches to 25
29.97 - tv switches to 30
30 - tv switches to 60i
50 - tv switches to 50
59.94 - tv stays on default fps (60)
60 - tv stays on default fps (60)

log: http://ix.io/17OG

Results default driver:
23.976 - tv switches to 24
24 - tv stays on default fps (60)
25 - tv switches to 25
29.97 - tv switches to 30
30 - tv switches to 60i
50 - tv switches to 50
59.94 - tv stays on default fps (60)
60 - tv stays on default fps (60)

log: http://ix.io/1aur