AMD/ATI Pixel Clock Patcher

[falkentyne]

(07-12-2015 12:18 AM)ToastyX Wrote:  

(07-11-2015 02:56 PM)eucalyptux Wrote:  Hello, i just tried to do the VT1500 trick+ tight timing with my freshly flashed XL2411Z v4, r9 290 and Catalyst 15.7
But i have a black screen (more like no backlight) when i switch to 120hz, is the 15.7 incompatible or im doing something else wrong ?

edit: vt1350 with default timing work but artefact

edit2: same with 15.5 beta

You might have to reduce the crosstalk setting as described here: http://forums.blurbusters.com/viewtopic.php?f=13&t=1689

Yes,
When using the VT tweak, the maximum "strobe phase" setting is reduced. The basic rule is, when using a VT 1500 tweak, the higher the refresh rate, the lower the max Strobe Phase will be.

Here are some limits I have found myself.
125 hz: VT 1498: Strobe phase 047 (Vt 1500 is laggy at 125hz on my xl2720z)
120 hz: VT 1500: Strobe phase 049
100 hz: VT 1502: Strobe phase 059
91 hz: VT 1502: strobephase 065 (custom refresh rate/resolution for call of duty)

Going 1 higher strobe phase past these will set the persistence to 0 ms which effectively shuts off the backlight (turning off blur reduction will bring the screen back).

A more indepth, but non confusing explanation of why the strobe phase is limited with a VT tweak is the first post by masterotaku here:

http://forums.blurbusters.com/viewtopic.php?f=13&t=560

I have a post somewhere explaining in a bit more detail exactly what the vertical total is doing to the monitor scaler. ToastyX could probably explain much better, but in the factory service menu#2 (V4 firmware only; power off, hold button 3+4 for 5 seconds then press power at the same time; button 1 and 2 on XL2411z), using a VT 1500 makes the scaler report that the vertical screen size is 1440 instead of 1080, which effectively "moves" the bottom strobe crosstalk off the physical end of the monitor and into some sort of virtual zone (which if you think about it, explains why the maxiumum strobe phase is lower with a VT tweak).