Comment # 1 on bug 1119621 from Felix Miata

You may be able to workaround this by removing the unofficially deprecated
xf86-video-intel driver. I have no such problem with modesetting on Kaby Lake:

# inxi -bxx
System:    Host: gb250 Kernel: 4.19.7-1-default x86_64 bits: 64 compiler: gcc
v: 8.2.1 Desktop: IceWM 1.4.2 dm: XDM
           Distro: openSUSE Tumbleweed 20181213
Machine:   Type: Desktop System: Gigabyte product: B250M-D3H v: N/A serial: N/A
           Mobo: Gigabyte model: B250M-D3H-CF v: x.x serial: N/A UEFI: American
Megatrends v: F9 date: 04/10/2018
CPU:       Dual Core: Intel Core i3-7100T type: MT MCP arch: Kaby Lake speed:
800 MHz min/max: 800/3400 MHz
Graphics:  Device-1: Intel HD Graphics 630 vendor: Gigabyte driver: i915 v:
kernel bus ID: 00:02.0
           chip ID: 8086:5912
           Display: server: X.Org 1.20.3 driver: modesetting unloaded:
fbdev,vesa alternate: intel
           resolution: 1920x1200~60Hz
           OpenGL: renderer: Mesa DRI Intel HD Graphics 630 (Kaby Lake GT2) v:
4.5 Mesa 18.1.7 compat-v: 3.0
           direct render: Yes
Info:      Processes: 173 Uptime: N/A Memory: 15.55 GiB used: 212.6 MiB (1.3%)
Init: systemd v: 239 runlevel: 5
           target: multi-user.target Compilers: gcc: 8.2.1 alt: 8 Shell: bash
v: 4.4.23 running in: xterm
           inxi: 3.0.28