All 4.19 kernels I have tested (up-to-date Tumbleweed) have given only a
flashing/intermittent display after bootloader on my laptop.
After GRUB instead of the splash screen, I see the manufacturer image from the
UEFI again and then the display spends most of its time off. Sometimes hitting
keys (or just randomly, perhaps something to do with screen refresh) brings the
display back for a moment and reveals system has actually booted and is
operational, just with no display.
Problem exists both on tty/console and in X (KDE), starting from the splash
screen and continuing till reboot/shutdown.
Booting and running kernels from 4.18 series work fine, completely stable, with
no changes in configuration. "Recovery mode" also gives a steady tty display.
No errors in Xorg.log or dmesg that I can spot.
> lsmod | grep i915
i915 2064384 15
i2c_algo_bit 16384 1 i915
drm_kms_helper 196608 1 i915
drm 471040 16 drm_kms_helper,i915
video 45056 1 i915
Not sure which packages are relevant.
libvulkan_intel-18.1.7-208.1.x86_64
libdrm_intel1-2.4.96-1.1.x86_64
ucode-intel-20180807a-1.1.x86_64
intel-gpu-tools-1.23-2.1.x86_64
libdrm_intel1-32bit-2.4.96-1.1.x86_64
xf86-video-intel-2.99.917+git8674.25c9a2fcc-1.1.x86_64
intel-vaapi-driver-2.2.0-1.1.x86_64
xf86-video-intel-32bit-2.99.917+git8674.25c9a2fcc-1.1.x86_64
xorg-x11-driver-video-7.6_1-17.2.x86_64
libdrm2-2.4.96-1.1.x86_64
kernel-default-4.19.7-1.5.x86_64 (not working)
kernel-default-4.18.15-1.2.x86_64 (working)
kernel-default-4.19.5-1.5.x86_64 (not working)
kernel-firmware-20181026-1.1.noarch
> sudo /usr/sbin/lshw -c video -c cpu
*-cpu
description: CPU
product: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
vendor: Intel Corp.
physical id: 1b
bus info: cpu@0
version: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
serial: To Be Filled By O.E.M.
slot: U3E1
size: 1378MHz
capacity: 4005MHz
width: 64 bits
clock: 100MHz
capabilities: x86-64 fpu fpu_exception wp vme de pse tsc msr pae mce cx8
apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht
tm pbe syscall nx pdpe1gb rdtscp constant_tsc art arch_perfmon pebs bts
rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni
pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid
sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand
lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti ssbd ibrs ibpb
stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep
bmi2 erms invpcid mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec
xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp
flush_l1d cpufreq
configuration: cores=4 enabledcores=4 threads=8
*-display
description: VGA compatible controller
product: UHD Graphics 620
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 07
width: 64 bits
clock: 33MHz
capabilities: pciexpress msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:127 memory:de000000-deffffff memory:c0000000-cfffffff
ioport:f000(size=64) memory:c0000-dffff