How to sharpen blurry fonts when connecting a laptop to an external monitor via HDMI?

Question

ASUS

Good day.
Deeply puzzled by the essence of what is happening with the connection of an external monitor to the laptop.
There is probably quite a lot of text, but I tried to describe everything in detail. I really hope for good advice.
In short, the problem is slightly blurred text (fonts) in programs (especially panels, menus) when an external monitor is connected to a laptop via HDMI.
The text is readable, but not comparable to the same text on the laptop itself.
In general, it is impossible to work, the eyes get tired very quickly. For movies or games, everything is fine, for work - no.
Essentially. Equipment:
1) Ancient laptop Sony VPCEB3E4R, 15.6 ATI Radeon HD5470 video card, VGA, HDMI connectors. Max resolution of the crap matrix 1366*768
(“Shit” because I have not seen worse quality matrices) In general, the laptop is old and slow. Software - Windows 7 Home Premium
2) Fresher laptop ASUS N56J, 15.6', NVIDIA GTX760M video card, same connectors - VGA, HDMI. Full HD resolution 1920*1080.
Windows 8.1 software. Why a monitor with a diagonal of 15.6 Full HD, I do not know. Unfortunately, this is such a trend apparently or "to be".
Small things are indescribable, work is also hard and harmful to the eyes. In many programs, fonts do not adapt and look muddy / soapy.
3) External monitor HP 22xi. Full HD 1920*1080. Connectors VGA, DVI-D Dual Link, HDMI
4) VGA-VGA, HDMI-HDMI cables.
Task: You need to connect an external monitor to an ASUS laptop so that there are all bunches of chips. An HDMI-to-HDMI cable is used for connection.
What was tested:
The connection process itself is not interesting because it takes one minute.
Further, everything by itself is perfectly defined and works, there is nothing to explain here.
The settings in the HP monitor do not give any significant improvement. All options covered.
The settings in the laptop for an external monitor are 1920 * 1080 frequency 60 Hz. Reducing the frequency and resolutions does not give any result, only worse.
Working on setting Clear Type fonts doesn't help. In the software settings of the video card, there is also nothing sensible on the merits of the issue.
As an option, I connected it via a VGA-VGA cable - quiet horror (which is logical, what did I expect?)). Permission moved down, there is no sharpness.
In general, advice is needed on what could be the matter and what to do.
HP was purchased in addition to ASUS for more comfortable work, but in fact it’s impossible to work ((
What is the SONY laptop for in the experiment? The fact is that since it has an HDMI connector,
my inquisitive mind could not deny myself the pleasure of checking the image quality with this old shabby laptop.
As a result, I saw a picture of excellent quality, which actually should be,
with good color reproduction and almost crystal clear fonts. I connected it with the same HDMI-HDMI cable.
The resolution on the external was 1920 * 1080, frequency 60 Hz, on the built-in 1366 *
768. Moreover, for the sake of experiment, when Clear Type is disabled, the font on the external monitor still remains in excellent shape.
My thoughts. Obviously, the HP monitor and cable are out of business. It's all about ASUS. There are two options here.
Either it's Windows 8.1 that "perverts" fonts so soullessly blurring them, or it's the video card.
But an unvoiced participant in the experiment speaks against these two options - this is one familiar FullHD TV (32 inches),
when connected to which ASUS's image was wonderful. The connection was HDMI-HDMI.
To make sure that the problem is in Window 8.1, I even had the idea to run the laptop from under another OS, from a flash drive, for example, from Ubuntu
(there is only one operating system on the laptop itself) and check the image quality in this way
(in my mind, I could use the opportunity install Windows 7, but so far I don’t like this option;)
If the image (fonts) is clear, then it means in Win 8.1.
In general, experts and just connoisseurs-amateurs, any of your opinions on this issue is interesting.
I really want to see a high-quality image when connecting an external HP monitor to an ASUS laptop. Thanks in advance.
Whom I tired with a large text - I understand you, such posts infuriate myself. Sorry :)
update
In order to eliminate the subjectivity factor in the concept of "blurred font", and in general to understand why I spread the scribble here, I attach two screenshots made by the PrntScrn program at a monitor resolution of 1920 * 1080:
Image on the built-in ASUS monitor :
i66.fastpic.ru/big/2015/1015/60/58ed1a56645b66f707...
Image on external HP monitor (from ASUS laptop):
i59.fastpic.ru/big/2015/1015/64/2a91a1fb883b344bfe...

Answer 1

It is very similar to incorrectly working scaling, in Windows 10 it’s quite a problem with this, in Windows 8.1, such problems also seem to occur, but less often.
It is not clear from the text in which mode you use the external monitor, as an extension of the main one, or as a clone?
In any case, here is an article on this issue: https://technet.microsoft.com/en-us/library/dn5288... , I think it will help you. Most often, you have to check the box to disable scaling in "Compatibility". The interface will become small, but at least the blur will disappear.

Answer 2

Check if you have video mirroring on the main monitor turned on.
Also, pay attention to the size of your pictures. They are not 1920x1080.

Answer 3

solved by settings, usually you need to shamanize where the monitors are broken, + in 8.1 there are separate settings for monitors, I don’t remember how they are called, but usually a die appears, you connected a new monitor and you can configure
it, I caught it on some nettops, there it was necessary that Then fix it in the BIOS so that the sharpness appears.

Answer 4

In my research, I came across this article, which prompted me to a very obvious solution to my question. It's all about scaling, of course. Therefore, anyone who thought so or suggested such an option is absolutely right. Here is an article in which everything is described in great detail habrahabr.ru/post/248135
I hope it will be useful to someone who has encountered a similar problem.
As for setting an individual scale for each monitor separately, here, apparently, there is no solution yet. Neither Windows tools, nor third-party programs How to change dpi only on the main laptop display? or How to make different scale for two displays? At the moment it is possible to set only one scale for all displays (I'm talking about Windows 8.1)