Intel Win11 Graphics Driver No High Refresh Rate(>60HZ)

[Jeremy_Wu]

I'm using Arc A750 in Windows11 24H2 but only one option 60Hz refresh rate there.

Win11-60Hz

Linux is OK on 2560*1600 @ 165Hz.

Linux-165Hz

How to enable 165Hz in Windows?

[MUC]

What happens when you enable Variable Refresh Rate Mode in Intel Graphics Software (if possible)?

Intel Graphics Software > Display > Scroll all the way down in the right pane:

The EDID only reports 60 Hz as the refresh rate. However, there is a FreeSync block that specifies 60 - 165 Hz.

[Jeremy_Wu]

It has no change no different whatever VRR and VRR Mode are. Just 60Hz.

VRR FullscreenVRR Fullscreen&WindowedVRR Mode DisabledVRR Disabled

[MUC]

Obviously there are differences in how the Windows and Linux drivers process the monitor's EDID. The EDID that this device sends is not entirely consistent.

The panel is a CSOT T3 MNG007DA1-1, which is a laptop screen. What cable did you use to connect this panel to the Arc A750?

[Jeremy_Wu]

You are right. I found the final blocks of EDID are different in Windows and Linux.

In Windows, Intel GCC Raw EDID:

00 FF FF FF FF FF FF 00 0E 6F 00 16 00 00 00 00
00 1E 01 04 B5 22 16 78 03 EE 95 A3 54 4C 99 26
0F 50 54 00 00 00 01 01 01 01 01 01 01 01 01 01
01 01 01 01 01 01 6E 6E 00 A0 A0 40 84 60 30 20
36 00 59 D7 10 00 00 18 00 00 00 FD 0C 3C A5 1F
1F 4E 01 0A 20 20 20 20 20 20 00 00 00 FE 00 43
53 4F 54 20 54 33 0A 20 20 20 20 20 00 00 00 FE
00 4D 4E 47 30 30 37 44 41 31 2D 31 0A 20 02 02

02 03 1D 00 E3 05 80 00 E6 06 05 01 6A 6A 24 6D
1A 00 00 02 03 3C A5 00 04 6A 24 6A 24 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 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 FF
02 03 1D 00 E3 05 80 00 E6 06 05 01 6A 6A 24 6D
1A 00 00 02 03 3C A5 00 04 6A 24 6A 24 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 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 FF

Linux is:

00 ff ff ff ff ff ff 00 0e 6f 00 16 00 00 00 00
00 1e 01 04 b5 22 16 78 03 ee 95 a3 54 4c 99 26
0f 50 54 00 00 00 01 01 01 01 01 01 01 01 01 01
01 01 01 01 01 01 6e 6e 00 a0 a0 40 84 60 30 20
36 00 59 d7 10 00 00 18 00 00 00 fd 0c 3c a5 1f
1f 4e 01 0a 20 20 20 20 20 20 00 00 00 fe 00 43
53 4f 54 20 54 33 0a 20 20 20 20 20 00 00 00 fe
00 4d 4e 47 30 30 37 44 41 31 2d 31 0a 20 02 02

02 03 1d 00 e3 05 80 00 e6 06 05 01 6a 6a 24 6d
1a 00 00 02 03 3c a5 00 04 6a 24 6a 24 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 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 ff

70 13 79 00 00 03 01 14 ac 2f 01 85 ff 09 9f 00
2f 00 1f 00 3f 06 83 00 02 00 05 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 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 37 90

I don't know why they are different. I just use a 16'' portable screen. There is an edp to minidp board inside it and using a minidp to DP cable connected to Arc A750.

[MUC · Accepted solution]

Yes, the EDID read with Linux contains a third block that also defines the 165 Hz video timing (with 777 MHz pixel clock). But I can't get it to appear on my Windows device either.

With a bit of fiddling around, I can say that there seems to be a pixel clock limit of 600 MHz with this configuration on the Intel Windows drivers.

If the Linux EDID is changed to take this into account, then you can run

• 2560 x 1600 @ 101 Hz RGB 10-bit (475.82 MHz) or
• 2560 x 1600 @ 127 Hz RGB 8-bit with dithering (598.31 MHz)

on Windows.

Please try this on yours:

• Download the EDID file attached
• Download Custom Resolution Utility (CRU)
• Run CRU.exe
• Make sure the active EDID is CSO1600 connected to your PC. If necessary, select from the drop down menu.

Please close CRU with OK and restart the computer.

Note:
All changes made with CRU can be undone if necessary by running "reset-all.exe" from the CRU download package and restarting the system. You can find more information about this tool on the linked page.

[Jeremy_Wu]

Thank you！🤗The EDID_mod you provided works well at 127Hz on Windows.😄

127HZ

Then I thought and tried to copy paste the EDID from Linux and import it with CRU on Windows, 165Hz comes out.😂

165HZ

So it can run at the same 165Hz on Windows as Linux. 👏But manually...🤣

[MUC]

Ah, all the better! Then the pixel clock limit seems to be a phenomenon on my simulation environment only.