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plaganum · (Last edited: 12-08-2020, 05:55 PM by plaganum)

(12-08-2020 03:16 AM)ToastyX Wrote:
(12-08-2020 02:12 AM)plaganum Wrote: I'm about to just plug in an external HDMI switch and call it a day, but I really want to get this working. It's killing me that it's so close. Is there any info I can provide to help get this to behave?
I said you need an HDMI support data block in the first extension block. I don't see that in your screen shots. Why not just use HDMI-DVI with the Nintendo Switch instead, since it only needs 1080p? Then you won't have to deal with workarounds.

Ok, so here's what I'm seeing:
[Image: ivAsF3P.png]

The only available resolutions in the dropdown are both 2160 vertically. I tried adding the extension block without a resolution, but it exhibits the same behavior when I restart (downsampled/upscaled). I tried googling "HDMI codes" to see if there was a code for 2160x1440@60Hz, but I'm not finding much. Do I have the Extension Block type and other settings correct? (I tried adding a detailed resolution in the extension block, but no change.)

Thanks!

Canes · 12-08-2020, 05:58 PM

Hi. Just used this nifty little utility to get my Asus monitor to LCD standard in order to fix the always-max VRAM Clock Speed on some AMD GPUs (followed a Reddit post). What I wanted to ask: It changed my Back porch, Blanking and Frequency by a few points as can be seen below. I'm sure this won't break my monitor, but I wanted to know what does this do exactly, what does it change in newbie-friendly terms? Does it change the response times of the monitor, does it make any changes to the color, blurriness or any such? Does it make it slower?

[Image: b68Zk2a.png]

Thank you in advance.

***ToastyX*** · 12-09-2020, 02:48 AM

(12-08-2020 05:58 PM)Canes Wrote: Hi. Just used this nifty little utility to get my Asus monitor to LCD standard in order to fix the always-max VRAM Clock Speed on some AMD GPUs (followed a Reddit post). What I wanted to ask: It changed my Back porch, Blanking and Frequency by a few points as can be seen below. I'm sure this won't break my monitor, but I wanted to know what does this do exactly, what does it change in newbie-friendly terms? Does it change the response times of the monitor, does it make any changes to the color, blurriness or any such? Does it make it slower?

The blanking controls how long to wait between each line/frame:
https://www.monitortests.com/blog/timing...explained/

The timing parameters don't affect the image quality. The only thing that changes is how long it takes for the refresh to complete. A larger vertical blanking reduces the time it takes to refresh the screen, but increases the time between refreshes. In your example, the difference is around 0.2 ms.

The reason the GPU doesn't change the memory clock if the vertical blanking is too low is because it doesn't have enough time to retrain the memory without visible screen flicker/corruption.

***ToastyX*** · 12-09-2020, 02:50 AM

(12-08-2020 05:54 PM)plaganum Wrote: The only available resolutions in the dropdown are both 2160 vertically. I tried adding the extension block without a resolution, but it exhibits the same behavior when I restart (downsampled/upscaled). I tried googling "HDMI codes" to see if there was a code for 2160x1440@60Hz, but I'm not finding much. Do I have the Extension Block type and other settings correct? (I tried adding a detailed resolution in the extension block, but no change.)

If you used the alternative method, then that's still in effect. Run reset-all.exe and reboot first. Then delete the default extension block (if it has one) and add a CEA-861 extension block and an HDMI support data block like you did. You don't need anything else. Then make sure 2560x1440 @ 60 Hz is the first detailed resolution (not in the extension block).

***ToastyX*** · 12-09-2020, 02:55 AM

(12-08-2020 04:53 PM)mederic.caldas Wrote: I'm an old user of CRU since my surface book 1 & 2. It used to work and let me redure the main screen resolution from 3k*2k to 1920*1280 with a 150% scaling instead of 200% or more.

Nevertheless I have now a surface book 3 and this method doesnt work. I try to add a resolution like 1920*1280 and after a restart screen is black.... Only way to resolve it is by a reset with external screen.

Can you give me some advice about reducing the def on main screen to redure scaling.... Cause with external HDMI screen it makes the programs goes wrong with some blurry window.

Is that happening with any change?

Run reset-all.exe and reboot. Then install this program: https://www.entechtaiwan.com/util/moninfo.shtm

Then run MonInfo and choose the "Real-time" display. Then save a .bin file and post it here.

***ToastyX*** · 12-09-2020, 02:57 AM

(12-08-2020 01:39 PM)traderdude123 Wrote: So is there any way i can force 12 bpc at 4k/100hz/ycbcr444?

CRU can't force anything. Does changing the maximum TMDS character rate to 1200 Mcsc make any difference? The highest value it will accept is 1275 Mcsc, so I'm not sure that's used with HDMI 2.1.

The only other thing I can think of is try creating a detailed resolution in a DisplayID extension block and tweak the timing parameters to reduce the bandwidth.

CRU doesn't currently have a preset for the CTA-861 timing parameters for 3840x2160 @ 100 Hz, so you'll have to enter it manually:

Code:

Active:       3840  2160

Front porch:  1056     8

Sync width:     88    10

Back porch:    296    72

Refresh rate:  100 Hz

Pixel clock:  1188 MHz

Then try reducing values and see if the TV will display it.

traderdude123 · 12-09-2020, 08:34 AM

(12-09-2020 02:57 AM)ToastyX Wrote:
(12-08-2020 01:39 PM)traderdude123 Wrote: So is there any way i can force 12 bpc at 4k/100hz/ycbcr444?
CRU can't force anything. Does changing the maximum TMDS character rate to 1200 Mcsc make any difference? The highest value it will accept is 1275 Mcsc, so I'm not sure that's used with HDMI 2.1.

The only other thing I can think of is try creating a detailed resolution in a DisplayID extension block and tweak the timing parameters to reduce the bandwidth.

CRU doesn't currently have a preset for the CTA-861 timing parameters for 3840x2160 @ 100 Hz, so you'll have to enter it manually:

Code:

Active: 3840 2160 Front porch: 1056 8 Sync width: 88 10 Back porch: 296 72 Refresh rate: 100 Hz Pixel clock: 1188 MHz

Then try reducing values and see if the TV will display it.

Tried it. i added the displayid section successfully and restarted.

But still could not get the 12bpc @ 4k/100hz in nvcp.

i managed to get the edid info using asset manager utility.

can you tell me if the TV can support 4k/100hz/ycbcr444/12bpc from this file?

if the TV can support it , then its clearly a driver issue. Then the ball falls in the nvidia's court.

***ToastyX*** · 12-09-2020, 03:18 PM

(12-09-2020 08:34 AM)traderdude123 Wrote: can you tell me if the TV can support 4k/100hz/ycbcr444/12bpc from this file?

if the TV can support it , then its clearly a driver issue. Then the ball falls in the nvidia's court.

Oh, I do see something that would limit the maximum FRL rate to 40 Gbps. I didn't know what that was for because I don't have the HDMI 2.1 specs, but your comment about FRL helped me make the connection. CRU doesn't have a way to edit any of the HDMI 2.1 features yet, but it can import the changes.

Try importing this file:

.dat

lg-cx-48gbps.dat (Size: 1.04 KB / Downloads: 2702)

traderdude123 · (Last edited: 12-09-2020, 04:01 PM by traderdude123)

(12-09-2020 03:18 PM)ToastyX Wrote:
(12-09-2020 08:34 AM)traderdude123 Wrote: can you tell me if the TV can support 4k/100hz/ycbcr444/12bpc from this file?

if the TV can support it , then its clearly a driver issue. Then the ball falls in the nvidia's court.
Oh, I do see something that would limit the maximum FRL rate to 40 Gbps. I didn't know what that was for because I don't have the HDMI 2.1 specs, but your comment about FRL helped me make the connection. CRU doesn't have a way to edit any of the HDMI 2.1 features yet, but it can import the changes.

Try importing this file:

@toastyx,

I cannot believe what just happened.I imported the lg-cx-48gbps.dat file.

I m getting 4k/120hz/ycbcr444/12bpc on my lg cx which has only 40Gbps.

but 4k/120hz/ycbcr444/12bpc requires full 48 gbps.

How is this even possible?

See attachment.

Edit: even the TV hdmi stat info is showing 4k/120hz/Ycbcr444 12b 4L12

***ToastyX*** · 12-09-2020, 04:22 PM

(12-09-2020 03:58 PM)traderdude123 Wrote: I cannot believe what just happened.I imported the lg-cx-48gbps.dat file.

I m getting 4k/120hz/ycbcr444/12bpc on my lg cx which has only 40Gbps.

but 4k/120hz/ycbcr444/12bpc requires full 48 gbps.

How is this even possible?

I changed the max to 48 Gbps (12 x 4 lanes). A future version of CRU will be able to edit the value. Sometimes TVs will support features that aren't listed in the EDID like higher refresh rates or color formats. I didn't know what the FRL rate was for until now.