Can't get higher resolution on Red Hat 7.2

Hi everyone,

recently I have installed red hat 7.2 (no-Cost RHEL for developers). After the installation I have booted into red hat and couldn't change the resolution of display (every thing is big now!) The only available resolution is 1024x768 and the monitor is unknown in the display setting. I have updated everything and it doesn't solve my problem.
I have checked the xorg direction (/etc/X11) and there is no xorg.conf, which can be normal I think (correct me if I'm wrong). I have searched about the issue and found out that I can create a xorg.conf file by running

Xorg -configure

Now when I run this command it fails with the following error:

Number of created screens does not match number of detected configuration failed.

I have also tried to use elrepo and installed xorg-x11-drv-intel but it didn't solve the issue either.
I don't know if it's relevant to the issue or not but at the system start I get the following errors:

FastTSC calibration failed
snd_hda_intel 0000:00:1f.3: failed to add i915 component master (-19)

I have a MSI Mortar Motherboard (b150m) and an Intel Skylake CPU.
I use the on-board graphic card of my motherboard and have no other graphic cards.

I'm trying for days now and I didn't find a solution.
Can anyone help me with the issue?