Re: Benq XL2411 - Can't get rid of ghosting
Posted: 13 Feb 2017, 17:03
If the problem happens when moving diagonally up to the left and not up to the right, then I would blame that on the game.
I haven't played PoE even though I do own it, so I can't really help. I assume changing the strobe phase from 0 to 90 changes this?
(if using a VT tweak at higher than 60hz refresh rate, going too high on the strobe phase exceeds the strobe timing and the backlight will shut off if blur reduction is on).
VT 1497-VT 1502 works because Lightboost uses this range internally. Benq reverse engineered Lightboost, which is why on V1 firmware, all refresh rates lower than 100hz would double strobe, 50hz-97hz
If you unlock the factory menu (which is also called the burn-in menu), you will see how changing the VT interacts with the scaler.
Starting with low Vt changes, even a little below the default of VT 1133 or VT 1144, you will see the vertical resolution change slowly in chunks. Eventually certain VT's will show a picture but display "Out of range" because the scaler will be working with an improper resolution. Example: going above VT 1380, to VT 1410 will display "1792x1344", with an out of range popup error. Higher than 1410 will black screen up to 1481, when an out of range error of 1920x1440(!) appears. Then after VT 1485, more black screens, then at VT 1497, suddenly the 1920 changes to 1280(!)x1440, and no more errors (since this range is used by Lightboost).
50hz is missing single strobe data.
If you're still getting jitter, raise or lower the VT by "1" until it goes away. This jitter MUST be tested in TestUFO/alien invasion. Testing for it in games is too unreliable.
You can run the toastyx driver restarter after each attempt.
The best way to test this is to set the desktop refresh rate to 100hz, and then switch to 60hz to test it, rather than having the desktop reset to 60hz after running the toastyX driver restarter.
I actually forgot about the HDMI pixel clock limits.
HDMI pixel clock is limited to <165 MHz, which is half of the dual link DVI clock limits of 330 MHz (basically single link dvi), so I'm not even sure if a HT of 2876 will work over HDMI. As I think you'd be over 250 MHz pixel clock. Remember I never tested VT tweaks over HDMI. I only tested HDMI once or twice, I think to do a "bug" with Hue and Saturation (they unlock over HDMI, but you can SAVE the values into a gaming preset, then hook up DVI and RECALL the preset, and even though the values are greyed out, the values you changed actually get USED....meaning it's "possible" to use Hue and Saturation over DVI--this does NOT work in Standard Mode though, only FPS/RTS modes).
But yeah. basically, any jittering you get would be at the same periodic rate, if it's being caused by a VT tweak being sent to the scaler. Usually between every half second to every 8 seconds (yes I've seen it that high before).
This is over displayport on a XL2720Z, but the most trouble free VT tweaks I've found on this monitor are:
60hz: VT 1354 (HT 2080)
85hz: VT 1350, VT 1501 (everything else stutters in the "lightboost" VT range of 1497-1502; 1497, 1498, 1499, 1500 and 1502 all repeatedly stutter, only 1501 works well).
100hz: VT 1500, 1502
120hz: VT 1500
125hz: VT 1497
2560x1440 100hz (Displayport, DVI): HT 2720, VT: 1500 <--yes this works. This apparently works on a XL2411z and XL2420Z and 2430T.
2560x1440 115hz (displayport only. DVI will black screen): HT: 2641, VT: 1500
I haven't played PoE even though I do own it, so I can't really help. I assume changing the strobe phase from 0 to 90 changes this?
(if using a VT tweak at higher than 60hz refresh rate, going too high on the strobe phase exceeds the strobe timing and the backlight will shut off if blur reduction is on).
VT 1497-VT 1502 works because Lightboost uses this range internally. Benq reverse engineered Lightboost, which is why on V1 firmware, all refresh rates lower than 100hz would double strobe, 50hz-97hz
If you unlock the factory menu (which is also called the burn-in menu), you will see how changing the VT interacts with the scaler.
Starting with low Vt changes, even a little below the default of VT 1133 or VT 1144, you will see the vertical resolution change slowly in chunks. Eventually certain VT's will show a picture but display "Out of range" because the scaler will be working with an improper resolution. Example: going above VT 1380, to VT 1410 will display "1792x1344", with an out of range popup error. Higher than 1410 will black screen up to 1481, when an out of range error of 1920x1440(!) appears. Then after VT 1485, more black screens, then at VT 1497, suddenly the 1920 changes to 1280(!)x1440, and no more errors (since this range is used by Lightboost).
50hz is missing single strobe data.
If you're still getting jitter, raise or lower the VT by "1" until it goes away. This jitter MUST be tested in TestUFO/alien invasion. Testing for it in games is too unreliable.
You can run the toastyx driver restarter after each attempt.
The best way to test this is to set the desktop refresh rate to 100hz, and then switch to 60hz to test it, rather than having the desktop reset to 60hz after running the toastyX driver restarter.
I actually forgot about the HDMI pixel clock limits.
HDMI pixel clock is limited to <165 MHz, which is half of the dual link DVI clock limits of 330 MHz (basically single link dvi), so I'm not even sure if a HT of 2876 will work over HDMI. As I think you'd be over 250 MHz pixel clock. Remember I never tested VT tweaks over HDMI. I only tested HDMI once or twice, I think to do a "bug" with Hue and Saturation (they unlock over HDMI, but you can SAVE the values into a gaming preset, then hook up DVI and RECALL the preset, and even though the values are greyed out, the values you changed actually get USED....meaning it's "possible" to use Hue and Saturation over DVI--this does NOT work in Standard Mode though, only FPS/RTS modes).
But yeah. basically, any jittering you get would be at the same periodic rate, if it's being caused by a VT tweak being sent to the scaler. Usually between every half second to every 8 seconds (yes I've seen it that high before).
This is over displayport on a XL2720Z, but the most trouble free VT tweaks I've found on this monitor are:
60hz: VT 1354 (HT 2080)
85hz: VT 1350, VT 1501 (everything else stutters in the "lightboost" VT range of 1497-1502; 1497, 1498, 1499, 1500 and 1502 all repeatedly stutter, only 1501 works well).
100hz: VT 1500, 1502
120hz: VT 1500
125hz: VT 1497
2560x1440 100hz (Displayport, DVI): HT 2720, VT: 1500 <--yes this works. This apparently works on a XL2411z and XL2420Z and 2430T.
2560x1440 115hz (displayport only. DVI will black screen): HT: 2641, VT: 1500