# Hardware

Latest (nov 2019) Dell XPS 7390 with Intel i915 chipset

# Kernel

5.4.10-1-default (OS Tumbleweed up to date)
(same behavior was noticed with the 5.3.x kernels)

# Relevant outputs

## lspci

00:02.0 VGA compatible controller: Intel Corporation UHD Graphics (rev 02)

## lshw

        *-display
             description: VGA compatible controller
             product: UHD Graphics
             vendor: Intel Corporation
             physical id: 2
             bus info: pci@0000:00:02.0
             logical name: /dev/fb0
             version: 02
             width: 64 bits
             clock: 33MHz
             capabilities: pciexpress msi pm vga_controller bus_master cap_list
rom fb
             configuration: depth=32 driver=i915 latency=0 mode=1920x1080
visual=truecolor xres=1920 yres=1080
             resources: iomemory:600-5ff iomemory:400-3ff irq:139
memory:604a000000-604affffff memory:4000000000-400fffffff ioport:3000(size=64)
memory:c0000-dffff

## /proc/cmdline

BOOT_IMAGE=/boot/vmlinuz-5.4.10-1-default
root=UUID=55518547-6da3-4579-bdad-ecf3dbee0de4 splash=silent
resume=/dev/disk/by-id/nvme-PC601_NVMe_SK_hynix_512GB_AD9BN4767124YBC32-part3
mitigations=auto quiet

# Description

>From time to time, the screen flickers, freezes and goes back to normal. The
following message can be seen in the journal:

kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A
FIFO underrun

Sometimes this problem leads to the computer being unusable, the screen does
not return to a normal state and switching to another TTY via Ctrl+Alt+Fx does
not work.
When the computer exits from sleep, the same behavior can be observed, the
login screens' (provided by GDM in my case) colors are messed up.

This affects only the build-in screen in my case. Even if an external monitor
is connected it does not seem to be affected so far.

# Possibly related bugs

https://bugzilla.opensuse.org/show_bug.cgi?id=1156254
https://bugzilla.opensuse.org/show_bug.cgi?id=1132926

Please let me know if I can help by providing further information or testing
some kernel options.