After installing FreeBSD,...

I had xorg errors during installing FreeBSD in UEFI Mode. I tried many methods to fix it. But nothig fixed. So I tried in Legacy Mode. In Legacy Mode, everything is ok. I don't understand so much why not available in UEFI Mode. My PC has two HDDs(1 TB & 300GB). On 1TB Drive, I am running Debian GNU/Linux in UEFI Mode. I would like to install FreeBSD on 300GB Drive. Now I successfully installed FreeBSD with Gnome3 DE in Legacy Mode. But I still have graphic errors. I can't control brightness, night mode doen't work. I tried the instructions from FreeBSD Handbook, but nothing fixed.
 

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I had xorg errors during installing FreeBSD in UEFI Mode
FreeBSD installer does not come with Xorg, so I assume that it is after installing x11/xorg and trying to run X with startx (after setting up a simple window manager session).
For that we will need to have the content of Xorg logs
/var/log/Xorg.0.log
The information of the kernel module loaded (i915kms is needed)
kldstat -v
The output of sysrc kld_list
The content of /boot/loader.conf

Gnome3 DE in Legacy Mode. But I still have graphic errors
If the graphics error are icons, it is know bug with recent gnome3 update, you will need to install the gnome icons set and then set the default icons set to gnome with deskutils/gnome-tweaks

I can't control brightness
For that you may try graphics/intel-backlight
night mode doen't work
For that the best bet would be to use something like accessibility/redshift

And finally the most important one: which FreeBSD version are you installing ?
 
FreeBSD installer does not come with Xorg, so I assume that it is after installing x11/xorg and trying to run X with startx (after setting up a simple window manager session).
For that we will need to have the content of Xorg logs
/var/log/Xorg.0.log
The information of the kernel module loaded (i915kms is needed)
kldstat -v
The output of sysrc kld_list
The content of /boot/loader.conf


If the graphics error are icons, it is know bug with recent gnome3 update, you will need to install the gnome icons set and then set the default icons set to gnome with deskutils/gnome-tweaks


For that you may try graphics/intel-backlight

For that the best bet would be to use something like accessibility/redshift

And finally the most important one: which FreeBSD version are you installing ?
FreeBSD-12.2-RC3-amd64
 
And in particular, please post the textual information that is essential for your problem.
You say “xorg errors”, so what are those errors exactly? The Xorg.0.log file would be a good start.
 
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