Can't set custom resolution to 4k 50Hz "Exceeds Bandwidth"

RHann3 · ‎04-11-2017

I have an LG 27UD68P 4K display which supports 50Hz modes in HDMI (but not 4K) and I have it plugged in via DisplayPort from my i7 with Intel 520 graphics.

4kp60 works fine but it doesn't provide an option for 4kp50, when I go to set Custom Resolution to 50Hz it says the resolution "exceeds the maximum bandwidth". But 50Hz is lower bandwidth than 60Hz so why would I get that message?

I would accept a refusal based on the LG refusing to support 50Hz but I don't understand the message from the Intel graphics tool!

Driver Version: 21.20.16.4574

OS: Windows 7 Enterprise

Memory 16GB

CPU: i7-6600U

Graphics: Intel HD Graphics 520

VBIOS: 1043.16

Current Resolution: 3840 x 2160

Refresh Rate: 60Hz

idata · ‎04-11-2017

Hello bobdvb,

I understand you are trying to use 4K screen resolution at 50Hz.

Let me apologize for any inconvenience this issue may be causing to you.

In order to help you better I would like to get the Intel Graphics Driver Report. This link will show you how to generate it http://www.intel.com/content/www/us/en/support/graphics-drivers/000005848.html http://www.intel.com/content/www/us/en/support/graphics-drivers/000005848.html

I was also checking the specifications of the monitor on LG's website, but I did not find information about if the monitor supports or not 50Hz. Where did you see the monitor supports 4k@50Hz?

To attach a file, you must click "Use Advanced Editor" on the upper right hand corner of the response box, then the "attach" option will appear on the bottom right hand corner of the response box.

Regards,

Fred

RHann3 · ‎04-12-2017

Attached.

The monitors EDID is reporting only 60Hz via DP but via HDMI it is different, which is why I asked here why custom resolution cannot be set.

idata · ‎04-12-2017

Hello bobdvb,

Thanks for the information you sent to me.

According to the Intel Graphics Driver Report the monitor does not seem to support 4K@50Hz. We can try a couple of troubleshooting steps, but there is a chance you may not be able to get 4K@50Hz.

One of the troubleshooting steps you can try is updating the graphics driver. You can download latest graphics driver from this link https://downloadmirror.intel.com/26669/eng/win64_154516.4627.zip https://downloadmirror.intel.com/26669/eng/win64_154516.4627.zip

Please install the graphics driver with the steps that are on this YouTube video https://www.youtube.com/watch?v=S1KzoQDjMMY https://www.youtube.com/watch?v=S1KzoQDjMMY

The content on the above site is not controlled by Intel. This information is offered for your convenience and should not be viewed as an endorsement by Intel for the merchants or services offered there.

Another troubleshooting step you can try is installing the monitor driver so they system can properly recognize all of the monitor features. You can download the driver from this link http://www.lg.com/uk/support/support-product/lg-27UD68P http://www.lg.com/uk/support/support-product/lg-27UD68P

Let me know if issue persists or not.

Regards,

Fred

idata · ‎04-18-2017

Hello bobdvb,

I was wondering if you were able to try the troubleshooting steps I provided. If you still need assistance just let me know.

Regards,

Fred