i have a little problem with my mac and external tv (LG 4K).

Macbook air 2012 (intel HD 4000) LG 43UJ6307

i connect macbook with MiniDisplayPort -> DVI -> HDMI (1.4). by default i cannot set resolution to 2560x1440 (max resolut. is fullHD) but i fix it by switchResX app (but this only app can change this resolution more than fHD). when i set resolution to 2k fonts are vert uggly and readble. when i connect my Desktop pc and resolution to same size fonts are pretty and more understandable. (in 2k and 4k).

i was disable in Settings -> General -> Use LCD Smoothing when available

How can i fix it ?

i saw thereis option for HIDPI but there is only two variants 960x540 (HIDPI) 850x450 (HIDPI)


It sounds like your TV is not correctly connected to the Mac, so that you only have Full HD resolution available instead of the UHD resolution you want.

I would suggest trying with a different cable from mini-DisplyPort directly to HDMI. This should give you the least amount of problems connecting to the TV. Ensure that the cable specifically supports 4k.

I have seen multiple times that even cables sold as HDMI 1.4 cables do not really support 4k with the Mac (I guess some companies deliberately re-label old cables). Specifically I have seen this also with expensive cables, where as a cheap HDMI cable from IKEA works without any problems.

  • on the same cable hdmi - dvi if i connect to PC integrated HD 630 Graphics (DVI) Windows 10, i got full 3860x2160 @ 30Hz , yeah i know that hdmi and dvi not support more than hdmi -full hd and dvi 2560. Resolution i can fix but font on mac looks very ugly and not readble on 2560x1600. for example on windows pc if set this resolution is more pretty and i can read something or write. i read that i need set force RGB and disable LCD Smooting – Mixmax Makster Oct 21 '17 at 11:04
  • You're not using the same combination of cables. I will still suggest the cable I mentioned above. The reason for the ugly fonts is probably the resolution. Check the input resolution on the TV's menu to determine which resolution you're really running. – jksoegaard Oct 21 '17 at 17:45
  • ok, i'll try use combination of cables mini DP to hdmi and hdmi cable to TV. but i read somewhere that OS incorrectly detecting TV. i mean that i need use a monitor configuration for TV set a force RGB – Mixmax Makster Oct 29 '17 at 17:48

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