topic Re: Why can't I set refresh rate above 30Hz on 4k TV with 8250U? in Mobile and Desktop Processors

Why can't I set refresh rate above 30Hz on 4k TV with 8250U?

GHorv3 — Sun, 03 Mar 2019 02:21:28 GMT

I have a 4k TV (Samsung 49NU7300) and a Windows laptop with Intel Core 8250U processor, connected with a 18GBps transfer speeded HDMI 2.0 cable, which supports 4k. According to the TV's and the Intel UHD Graphics 620's specifications, everything should be fine to set the refresh rate to 60Hz. The driver version is 24.20.100.6286 .

Re: Why can't I set refresh rate above 30Hz on 4k TV with 8250U?

AlHill — Sun, 03 Mar 2019 02:24:42 GMT

The 4K 60hz is only supported on DP, not HDMI:

https://ark.intel.com/content/www/us/en/ark/products/124967/intel-core-i5-8250u-processor-6m-cache-up-to-3-40-ghz.html

Doc

Re: Why can't I set refresh rate above 30Hz on 4k TV with 8250U?

GHorv3 — Sun, 03 Mar 2019 02:28:47 GMT

How can I solve this problem? Neither my TV and my laptop doesn't have DP.

Re: Why can't I set refresh rate above 30Hz on 4k TV with 8250U?

GHorv3 — Sun, 03 Mar 2019 02:29:23 GMT

How can I solve this problem? Neither my TV and my laptop doesn't have DP.

Re: Why can't I set refresh rate above 30Hz on 4k TV with 8250U?

AlHill — Sun, 03 Mar 2019 02:33:28 GMT

I do not think you can. Perhaps some good DP to HDMI active adaptor might work, but I am just guessing...

Or, get a TV that has 4K 60hz on DP.

Doc

Re: Why can't I set refresh rate above 30Hz on 4k TV with 8250U?

GHorv3 — Sun, 03 Mar 2019 02:51:12 GMT

I've did some research ( https://forums.tomsguide.com/threads/laptop-that-can-output-4k-60hz.422352/ , https://www.intel.com/content/www/us/en/support/articles/000023945/graphics-drivers.html ), and it should definitely support 4k@60Hz, with HDMI 2.0, and just 30Hz if the cable is 1.4 . Any suggestions?

Re: Why can't I set refresh rate above 30Hz on 4k TV with 8250U?

AlHill — Sun, 03 Mar 2019 02:59:05 GMT

We will have to wait for an Intel support engineer to verify.

Doc

Re: Why can't I set refresh rate above 30Hz on 4k TV with 8250U?

n_scott_pearson — Sun, 03 Mar 2019 10:37:32 GMT

Intel processors natively support DP 1.2 output (which is capable of supporting 4K@60Hz). A LSPcon chip is used to convert formats in order to support HDMI connectors. In order to support 4K@60Hz, this chip must have hardware- and firmware-level support for HDMI 2.0 and 4K@60Hz. I suggest you talk to your laptop vendor and see if they have provided a compliant chip. Note that it may take a firmware update to get support for this capability, so remember to ask them specifically about this.

Hope this helps,

...S

Re: Why can't I set refresh rate above 30Hz on 4k TV with 8250U?

ZZZ83 — Fri, 16 Jul 2021 22:42:15 GMT

I have similar issue, I have Sony 65X850E , it works well with AMD R5 2400GE (with Vega 11) on 4K 60Hz even with DP to HDMI convert cable. however, same TV same cable if I'm using Intel i5 8500T (with UHD630) it only works on 4K 30HZ.

I'm still on the way to find answer...