Incorrect login screen resolution

[Gofer83]

The problem:
Login screen resolution is 4K. It is too much. Everything is very little and hard to see.
Once logged in, the resolution changes to my preffered one, which is 1920x1080.
My PC is connected to 50 inch Samsung TV supporting resolutions up to 4K.

Can I somehow change login screen resolution to 1920x1080?

My machine:
System: Host: krzemowarakieta Kernel: 4.4.0-66-generic x86_64 (64 bit gcc: 5.4.0)
           Desktop: Gnome (Gtk 3.18.9-1ubuntu3.2) Distro: elementary 0.4 loki
Machine: Mobo: ASUSTeK model: Z170-DELUXE v: Rev 1.xx Bios: American Megatrends v: 1902 date: 06/27/2016
CPU: Quad core Intel Core i7-6700K (-HT-MCP-) cache: 8192 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 32066
           clock speeds: max: 4300 MHz 1: 2641 MHz 2: 932 MHz 3: 3000 MHz 4: 800 MHz 5: 995 MHz 6: 3000 MHz
           7: 958 MHz 8: 800 MHz
Graphics: Card: NVIDIA Device 1b80 bus-ID: 01:00.0
           Display Server: X.Org 1.18.4 drivers: nvidia (unloaded: fbdev,vesa,nouveau)
           Resolution: 1920x1080@60.00hz
           GLX Renderer: GeForce GTX 1080/PCIe/SSE2 GLX Version: 4.5.0 NVIDIA 367.57 Direct Rendering: Yes
Audio: Card-1 NVIDIA Device 10f0 driver: snd_hda_intel bus-ID: 01:00.1 Sound: ALSA v: k4.4.0-66-generic
           Card-2 Intel Sunrise Point-H HD Audio driver: snd_hda_intel bus-ID: 00:1f.3
Network: Card-1: Intel Ethernet Connection (2) I219-V driver: e1000e v: 3.2.6-k bus-ID: 00:1f.6
           IF: enp0s31f6 state: up speed: 100 Mbps duplex: full mac: <filter>
           Card-2: Broadcom BCM4360 802.11ac Wireless Network Adapter driver: wl bus-ID: 07:00.0
           IF: wlp7s0 state: down mac: <filter>
           Card-3: Intel I211 Gigabit Network Connection driver: igb v: 5.3.0-k port: c000 bus-ID: 0b:00.0
           IF: enp11s0 state: down mac: <filter>
Drives: HDD Total Size: 2520.5GB (0.6% used) ID-1: /dev/sda model: Samsung_SSD_850 size: 256.1GB
           ID-2: /dev/sdb model: Samsung_SSD_850 size: 1024.2GB
           ID-3: /dev/sdc model: WDC_WD1002FAEX size: 1000.2GB
           ID-4: /dev/sdd model: KINGSTON_SH100S3 size: 120.0GB
           ID-5: /dev/sde model: KINGSTON_SV300S3 size: 120.0GB
Partition: ID-1: / size: 110G used: 15G (14%) fs: ext4 dev: /dev/sde1
RAID: No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors: System Temperatures: cpu: 29.8C mobo: 27.8C gpu: 0.0:45C
           Fan Speeds (in rpm): cpu: 0
Info: Processes: 248 Uptime: 12 min Memory: 1278.0/32090.4MB Init: systemd runlevel: 5 Gcc sys: 5.4.0
           Client: Shell (bash 4.3.461) inxi: 2.2.35

[Gamunu Balagalla (gamunu)]

Could you try this: https://gist.github.com/RyanMillerC/c48d9f63f8fe386b22a7da18cf6913d2