Question: I'm using a 40" 4K display... laptop on the table, a Lenovo T60 with Intel 950 integrated graphics... I'm having serious scaling issues when displaying from the laptop to the 40". Things are too big and text isn't sharp. The display is supposed to support upscaling to 4K, but I don't know that I'm getting it. Are there things I can do to improve what I'm getting when using the 40" display with the laptop?
You are probably out of luck. If the image is filling the whole monitor then you are getting upscaling to 4K and it is going to be blurry, is why the age old rule is true that you should run an LCD display at its native resolution, but Intel 950 can't do 4K.
I know that nVidia, probably ATI too can adjust in the drivers how it does scaling (upsampling to 4K) then 4K is sent to the monitor but it isn't relevant in your case because your 950 video can't do 4K output.
There are a couple things you can try. Win10 (and Win8.1, not sure about Win7) can do per-monitor % scaling of the windows environment. That would allow making everything smaller and give more real-estate on the 40" monitor while leaving the built in laptop screen at same scaling it is now, but it will still be blurry.
2nd thing is you could set your monitor in its menu to not scale, then set the output to the monitor at the max resolution that the Intel 950 can do. I'm not 100% certain but that may be 2048×1536. You "might" have more resolution settings if using a newer driver from Intel rather than one built into windows if that's what you're running now. The result would be per-pixel, a sharp display on the 40" but it would use little more than half the screen width (so closer to 1/4th total area) with black bars around the displayed image. If you do that you shouldn't need to change the per display scaling % in windows much if at all. One consolation in giving up almost 3/4ths of the screen would be that I find a 40" screen (mine is larger but that's close enough) is a heck of a lot of light, causes me eyestrain if I don't turn the brightness down as much as I can before I can't make out images (grayscaling) well. Using just over 1/4th the screen, is just over 1/4th the light. In that regard I find turning down the blue hue to a warmer color temperature also helps, and this is also something the intel driver may not allow? Maybe on newer Intel chipsets? I don't know.
Ultimately the best solution would be a new laptop capable of HDMI2 video output (which implies 4K @ 60Hz support) then you would have full screen, sharp 4K on the 40", then you may or may not want to change windows' scaling % to adjust the size but it would still be sharp if you did.
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