Laptop limited to 300.99mhz, need help to push out max Hz

[Keyan90]

Hello,

I have an old but good Laptop (Asus ux330ua, bios unlocked) equipped with an i7-7500u and integrated Intel HD620 graphics (pixel clock capped to 300.99 mhz). HDMI output is limited to micro hdmi 1.4.

Im' using an external monitor (LG27UL500 4k 60 hz).

I have tried to improve a little bit the frequency in the resolution of 2160p and 1800p.

This are the maximum frequency I have reached (I'm using the monitor at 1800p 50 hz, 2160p 35hz is too slow).
Timing used are the CVT-RB2. See attachment.

Do you think I can do better and get higher frequency with manual timing? and how?
Really thanks in advance


P.s. The internal monitor works at 1800p, 60hz

[ToastyX]

You can reduce the horizontal and vertical blanking as low as the monitor can handle to reduce the pixel clock, but that will only get you a little more.

Blanking = front porch + sync width + back porch

You can get 2880x1620 @ 60 Hz with CVT-RB2, which is 1.5x 1080p.

[Keyan90]

(10-21-2021 11:22 PM)ToastyX Wrote:  You can reduce the horizontal and vertical blanking as low as the monitor can handle to reduce the pixel clock, but that will only get you a little more.

Blanking = front porch + sync width + back porch

You can get 2880x1620 @ 60 Hz with CVT-RB2, which is 1.5x 1080p.

Thanks man!

I have made a little progress, better then nothing.

Do you think this is the maximum I can do?
Have a good day!

   

Ps. Tried 1620p but it's not so sharp like 1800p

[ToastyX]

That's probably close to the maximum without patching the driver. I wanted to make an Intel pixel clock patcher, but I couldn't find where the limit is in the driver. One thing to watch out for is the TV might display refresh rates less than 60 Hz with frame duplication instead of spacing them out evenly, so make sure the motion is smooth and not juddery.

[Keyan90]

(10-28-2021 12:34 AM)ToastyX Wrote:  That's probably close to the maximum without patching the driver. I wanted to make an Intel pixel clock patcher, but I couldn't find where the limit is in the driver. One thing to watch out for is the TV might display refresh rates less than 60 Hz with frame duplication instead of spacing them out evenly, so make sure the motion is smooth and not juddery.

That's a really big goal! So keep up your good work.

Yes I can confirm that for my daily little usage, 51 mhz is pretty smooth (but u know, 52 is better then 51 and etc...). Maybe because I can't do gaming (in my case only some retrogaming for fun).

So thanks again for your time and your work!