I recently purchased a Hisense HLUD58XT880 LCD TV (LCD flat-panel with 3840x2160 native resolution). I have plugged my PC into the HDMI (UHD) port on the TV. My PC is running Windows 8.1 with a ATI mobility Radeon 4500/5100. I have tried multiple HDMI cables but am still not able to see a resolution above 1920x1080 in the list of resolutions, or a refresh rate above 60hz when I click
list all modes in system manager.
I am currently running 1920x1080 @ 60hz but notice a lag in the mouse movement, probably about 100ms or so. It's barely noticable when watching video but using the mouse or keyboard it's quite distinct.
I also wasn't able to find any kind of "driver" for the TV, nor was I able to find online what the maximum resolution / refresh rate that my video card supports is.
My thoughts are that this could be caused by:
1) pre-1.4 HDMI cable 2) video card not supporting 3840x2160 @ 100hz 3) TV reporting incorrect EDID information 4) TV crap
I don't really know how to diagnose any of these though. I've tried changing the HDMI cables around without effect, so I suspect
1 is not the cause. If
3 was the cause then I thought I would have been able to set a custom resolution by disabling "hide unsupported modes" in the display settings, but that had no effect (I still only saw lower resolutions/refresh rates).