Kexec doesn't properly reintialize GPU on Dell XPS13 9343

I've symlinked /lib/systemd/system/reboot.target to /lib/systemd/system/kexec.target and everything works fine except my framebuffer screen which on very initial screen with full disk encryption password starts to floating horizontally. I'm able to use it, after blindly typing password everything works fine, but I'm worried that something not initialized at this stage may break hardware, and it just doesn't look good.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: kexec-tools 1:2.0.16-1ubuntu1.1
ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
Uname: Linux 4.15.0-118-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Sep 22 06:30:13 2020
InstallationDate: Installed on 2015-05-08 (1963 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=pl_PL.UTF-8
 SHELL=/bin/bash
SourcePackage: kexec-tools
UpgradeStatus: Upgraded to bionic on 2018-08-26 (757 days ago)