Re: Arc A750 with incorrect resolutions and not support HDR10

RiceD · ‎06-25-2024

Hi,

I recently switch my AMD 5700xt to Arc A750, and found that the resolution and refresh rate is wired on A750. Thanks for the support in advance.

Issue 1: Using DP1.2 connection: the maximum refresh rate is 59.997Hz not 60Hz. It doesn't support HDR at all.

Issue 2: Using DP 1.2 (PC) - HDMI 2.0 (Monitor) connection: the maximum refresh rate can recognize 60Hz and 59.94Hz, but the screen is over scaling (there is about 10% display go beyond the actual screen size). It can support HDR, not HDR10.

Monitor: Acer KG281K (Support 4K HDR10, HDMI2.0/DP1.2)

Driver: 31.0.101.5592 (WHQL 2024/06/19)

CPU: 12600KF

Motherboard: UNIKA B660M-PRO DDR4

RAM: 64Gb

Operating System: Win10 Enterprise Build 19045

PSU: DeepCool 1000W

BIOS: Resizable Bar is On.

MUC · ‎06-26-2024

Please create a Report for Intel Graphics Drivers when using the DP > DP connection and attach the txt file here.

RiceD · ‎06-27-2024

Report Date: Thursday, 27 June 2024
Report Time [hh:mm:ss]: 10:02:42 PM
Operating System: Microsoft Windows 10 Enterprise 10.0.19045
IGCC Version: 1.100.5536.0
Language: en-AU
Physical Memory: 63.84 GB
Current Resolution: 3840x2160

Processor: 12th Gen Intel(R) Core(TM) i5-12600KF
Processor Speed: 3700 MHz
GFX Driver Name: Intel® Arc(TM) A750 Graphics
Shader Version: 5.1
OpenCL* Version: 3.0
* Microsoft DirectX* *
Runtime Version: 12
Hardware-Supported Version: 12
Vendor ID: 8086
Device ID: 56A1
Device Revision: 08
GFX Driver Version: 31.0.101.5592
Dedicated RAM: 8 GB
Shared RAM: 32 GB
Max Supported Displays: 4
GFX Vulcan: 1.3.284
Option ROM (OpROM) Version: 20.0.1064.0

* Devices connected to the Graphics Accelerator *

Active Displays: 3

* Digital Display 1 *

Display Name:
Display Type: Digital
Serial Number: -
DDC2 Protocol: Supported
Gamma: 2.2
Connector Type: HDMI

Maximum Image Size
Horizontal - 0 inches
Vertical - 0 inches

Supported Modes
640 x 480 (60p Hz)
800 x 600 (60p Hz)
1024 x 768 (60p Hz)
1280 x 720 (60p Hz)
1600 x 900 (60p Hz)
1920 x 1080 (60p Hz)
2560 x 1440 (60p Hz)
3840 x 2160 (24p Hz, 4K)
3840 x 2160 (25p Hz, 4K)
3840 x 2160 (30p Hz, 4K)
3840 x 2160 (50p Hz, 4K)
3840 x 2160 (60p Hz, 4K)
3840 x 2400 (30p Hz, 4K)
3840 x 2400 (60p Hz, 4K)

Power Management Support
Active Off Mode Supported

Raw EDID:
00 FF FF FF FF FF FF 00 4A 8B 1A 1B 00 00 00 00
2B 1E 01 03 A2 00 00 78 3E 64 35 A5 54 4F 9E 27
12 50 54 21 08 00 D1 C0 A9 C0 81 C0 01 01 01 01
01 01 01 01 01 01 72 E7 00 A0 F0 60 45 90 30 20
35 00 61 63 21 00 00 1A B9 73 00 A0 F0 60 45 90
30 20 35 00 61 63 21 00 00 1A 3E D0 00 A0 F0 70
3E 80 30 20 35 00 61 63 21 00 00 1A 00 00 00 FD
00 28 3D 1E 87 3C 00 0A 20 20 20 20 20 20 01 18

02 03 48 F1 51 04 4C 5D 5E 5F 60 61 00 00 00 00
00 67 68 69 6A 6B E3 05 C0 00 23 09 7F 07 83 01
00 00 E5 0F 00 00 0C 00 67 03 0C 00 10 00 38 78
67 D8 5D C4 01 78 88 01 E6 06 05 01 69 69 4F 68
1A 00 00 01 01 28 3D E6 02 3A 80 18 71 38 2D 40
58 2C 45 00 61 63 21 00 00 1E 56 5E 00 A0 A0 A0
29 50 30 20 35 00 61 63 21 00 00 1E 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 96

* Digital Display 2 *

Display Name: VFV
Display Type: Digital
Serial Number: demoset-1 0
DDC2 Protocol: Supported
Gamma: 2.2
Connector Type: DisplayPort

Maximum Image Size
Horizontal - 13.39 inches
Vertical - 7.48 inches

Supported Modes
800 x 600 (60p Hz)
1024 x 768 (60p Hz)
1280 x 720 (60p Hz)
1920 x 1080 (60p Hz)

Power Management Support
Active Off Mode Supported

Raw EDID:
00 FF FF FF FF FF FF 00 58 D6 32 BC 01 01 01 01
09 1A 01 03 80 22 13 78 3E EE 91 A3 54 4C 99 26
0F 50 54 01 08 00 D1 C0 01 01 01 01 01 01 01 01
81 80 01 01 81 C0 02 3A 80 18 71 38 2D 40 58 2C
25 00 58 C1 10 00 00 1E 00 00 00 FC 00 56 46 56
0A 20 20 20 20 20 20 20 20 20 00 00 00 FF 00 64
65 6D 6F 73 65 74 2D 31 0A 20 30 20 00 00 00 FD
00 32 4B 54 54 13 01 0A 20 20 20 20 20 20 01 7F

02 03 24 F2 41 04 E2 00 D5 E3 05 C0 00 23 09 7F
07 83 01 00 00 67 03 0C 00 10 00 38 3C E6 06 05
01 62 62 00 02 3A 80 18 71 38 2D 40 58 2C 25 00
55 50 21 00 00 1E 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 E4

* Digital Display 3 *

Display Name: Acer KG281K
Display Type: Digital
Serial Number: -
DDC2 Protocol: Supported
Gamma: 2.2
Connector Type: DisplayPort

Maximum Image Size
Horizontal - 24.41 inches
Vertical - 13.39 inches

Supported Modes
640 x 480 (60p Hz)
640 x 480 (75p Hz)
720 x 480 (60p Hz)
720 x 480 (60i Hz)
720 x 576 (50p Hz)
800 x 600 (56p Hz)
800 x 600 (60p Hz)
1024 x 768 (60p Hz)
1280 x 720 (50p Hz)
1280 x 720 (60p Hz)
1280 x 800 (60p Hz)
1280 x 960 (60p Hz)
1280 x 1024 (60p Hz)
1440 x 900 (60p Hz)
1680 x 1050 (60p Hz)
1920 x 1080 (50i Hz)
1920 x 1080 (50p Hz)
1920 x 1080 (60p Hz)
1920 x 1080 (60i Hz)
3840 x 2160 (24p Hz, 4K)
3840 x 2160 (25p Hz, 4K)
3840 x 2160 (30p Hz, 4K)
3840 x 2160 (60p Hz, 4K)

Power Management Support
Active Off Mode Supported

Raw EDID:
00 FF FF FF FF FF FF 00 04 72 2D 06 47 94 01 02
14 1E 01 04 B5 3E 22 78 3B 08 A1 A2 57 4F A2 28
0F 50 54 23 08 00 81 40 81 80 81 C0 81 00 95 00
B3 00 D1 C0 01 01 4D D0 00 A0 F0 70 3E 80 30 20
35 00 6D 55 21 00 00 1A B4 66 00 A0 F0 70 1F 80
08 20 18 04 6D 55 21 00 00 1A 00 00 00 FD 00 28
3C A0 A0 3C 01 0A 20 20 20 20 20 20 00 00 00 FC
00 41 63 65 72 20 4B 47 32 38 31 4B 0A 20 01 4F

02 03 31 F1 4F 01 03 04 12 13 05 14 1F 90 07 02
5D 5E 5F 61 23 09 07 07 83 01 00 00 6D 03 0C 00
10 00 38 78 20 00 60 01 02 03 E6 06 07 01 57 57
51 02 3A 80 18 71 38 2D 40 58 2C 45 00 6D 55 21
00 00 1E 01 1D 00 72 51 D0 1E 20 6E 28 55 00 6D
55 21 00 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96
00 6D 55 21 00 00 18 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 03

* Other names and brands are the property of their respective owners.

Screenshot for display settings:

MUC · ‎06-27-2024

I see the following in the diagnostic data:

Simultaneous output of 3 x 4K @ 60 Hz has been supported since Skylake platform, so this shouldn't be a problem.

What kind of device is that on the HDMI port? Seems to be a display or capture device with a Realtek chipset. Another portable monitor?
Can you please tell me the brand of your Arc A750 graphics card?
What kind of cables or adapters (HDMI/USB-C) did you use to connect device #1 and #2? Links to the products would be best.

Regarding HDR vs. HDR10: For transmission via HDMI 2.0, a maximum of 18 Gbps is available with the video timing provided according to CTA-861 HDMI standard. This means:

4K @ 60 Hz RGB 8-bit with dithering HDR = 18 Gbps = 594 MHz TMDS = OK
4K @ 60 Hz YCbCr 4:2:0 10-bit HDR = 11.14 Gbps = 371 MHz TMDS = OK
4K @ 60 Hz RGB 10-bit HDR = 20.05 Gbps = NOT OK

You can read about the difference between the color models (RGB <> YCbCr) here.

This is why primarily 8-bit with dithering is used (by Microsoft Windows) when it comes to bandwidth limits, as the RGB color model is still better for a monitor than the YCbCr color model. This is in turn better suited for TVs, as pixel-accurate rendering is not needed there but higher bit depth provides more viewing experience if suitable sources (e.g. cine films) are watched.

DisplayPort 1.2 (CVT-RB): 4K @ 60 Hz RGB 10-bit HDR = 93 % HBR2 = OK

According to the diagnostic data you posted the Acer KG281K offers these parameters to the graphics driver:

So, 59.997 Hz is presented by the monitor and this is OK.

I'd connect the VFV device to the HDMI port of the Arc A750 and the RTK to DisplayPort. All connections should be made without adapters if possible, so that the original protocol is used. The Acer KG281K must definitely be able to show 4K @ 60 Hz HDR10 via DisplayPort. Please test this with the monitor alone if necessary and unplug the other devices for testing.

RiceD · ‎07-04-2024

Hi MUC,

Firstly, thanks for the thoroughly reply. This is very helpful for understanding.

What kind of device is that on the HDMI port? Seems to be a display or capture device with a Realtek chipset. Another portable monitor?

Yes, my PC connects one 28 inch monitor (Device 3, Acer) and two portal screens. The hardware ID of #1 is RTK1B1A. No further information available.

Can you please tell me the brand of your Arc A750 graphics card?

GUNNIR

What kind of cables or adapters (HDMI/USB-C) did you use to connect device #1 and #2? Links to the products would be best.

#1 BlueRigger MiniHDMI -> HDMI: https://www.amazon.com.au/BlueRigger-High-Speed-cable-Ethernet/dp/B00608WXGA?th=1

#2 MiniHDMI -> HDMI -> DP

------------------------------------------------------------------------------------------------------------------------

The funny thing is that Device #1 and #2 works well with HDR, but the HDR option is completely disabled in #3 (Acer one)!! From the monitor information, confirmed the DP format is 1.2 (by using the DP-DP cable COXOC E119932T).

MUC · ‎07-04-2024

Thanks for the additional information, everything seems to be fine.

As you can see from the data you posted earlier, the Intel driver receives the so-called Extended Display Identification Data (EDID) from each display device via the cables. I analyzed the data and in contrast to the other two monitors the Acer monitor does not send any information via DisplayPort that it supports the ITU-R BT.2020 color space. But that is a requirement for activating HDR under Windows.

The only explanation I can think of is that DisplayPort version 1.2 does not actually have to support HDR according to the specification and that's why Acer may have left it out. I did not notice this at first because Intel has actually supported HDR via DP1.2 for a long time. But since the monitor can obviously process the color space via HDMI, we can try to add the information manually. I can't promise that it will work, but in my test environment (Iris Xe with driver 31.0.101.5593 without a real monitor but with the corresponding simulation) it works to get Windows to offer HDR. I was also able to activate HDR this way. Please proceed as follows:

Download Custom Resolution Utility (CRU)
Run CRU.exe
Make sure the active EDID is that of the Acer KG281K monitor connected to your Arc A750 via DisplayPort. If necessary, select from the drop down menu.
Proceed as follows:

Only select "BT.2020 RGB", close ALL windows with OK and restart the computer.

If this procedure does not make HDR appear, then unfortunately we have to accept that the monitor only supports HDR via HDMI and the monitor's DisplayPort hardware is a limitation.

RiceD · ‎07-08-2024

Hi MUC,

Thanks again and appreciated the detail instruction.

Still no luck after following the instruction. (Even tried to reduce the refresh rate to enable HDR10)

Based on my further research on Google, seems this is a common issue for ACER KG281G on nVidia cards (with DP connection) as well, but it works very well with AMD graphics card.

Anyway, it is a chance to upgrade my monitor. DP1.2 is too old now.

Thanks!!