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Latest kernel gives blank screen when it boots

I have spent the last several days setting up Fedora on
another partition. When it came to boot back into Debian Sid
this morning I discovered my screen goes blank after the first
few seconds.
The previous kernel is fine. 4.18.0-2-amd64 #1 SMP Debian 4.18.10-2 (2018-11-02) x86_64 GNU/Linux

This is the output of inxi-

System: Host: franklin Kernel: 4.18.0-2-amd64 x86_64 bits: 64 compiler: gcc v: 7.3.0 Desktop: IceWM 1.4.2 info: wbar
           dm: LightDM 1.26.0 Distro: Debian GNU/Linux buster/sid
Machine: Type: Desktop System: LENOVO product: 5536E2F v: ThinkCentre M90p serial: <root required> Mobo: LENOVO model: N/A serial: <root required> BIOS: LENOVO v: 5JKT47AUS date: 07/13/2010 Battery: Device-1: hidpp_battery_0 model: Logitech Wireless Keyboard K330 serial: 4016-b1-f3-8c-d1 charge: 100% (should be ignored) rechargeable: yes status: Discharging Device-2: hidpp_battery_1 model: Logitech Wireless Mouse M215 2nd Gen serial: 401b-11-8a-8b-04 charge: 100% (should be ignored) rechargeable: yes status: Discharging
Memory:    RAM: total: 3.54 GiB used: 486.8 MiB (13.4%)

PCI Slots: Permissions: Unable to run dmidecode. Are you root?
CPU: Topology: Dual Core model: Intel Core i5 660 bits: 64 type: MT MCP arch: Nehalem family: 6 model-id: 25 (37)
           stepping: 2 microcode: 11 L2 cache: 4096 KiB bogomips: 26601
Speed: 1463 MHz min/max: 1197/3326 MHz boost: enabled Core speeds (MHz): 1: 1464 2: 1463 3: 1463 4: 1463 Flags: acpi aes aperfmperf apic arat arch_perfmon bts clflush cmov constant_tsc cpuid cx16 cx8 de ds_cpl dtes64 dtherm dts ept est flexpriority flush_l1d fpu fxsr ht ibpb ibrs ida lahf_lm lm mca mce mmx monitor msr mtrr nonstop_tsc nopl nx pae pat pbe pclmulqdq pdcm pebs pge pni popcnt pse pse36 pti rdtscp rep_good sep smx ss ssbd sse sse2 sse4_1 sse4_2 ssse3 stibp syscall tm tm2 tpr_shadow tsc vme vmx vnmi vpid xtopology xtpr Vulnerabilities: Type: l1tf mitigation: PTE Inversion; VMX: conditional cache flushes, SMT vulnerable
           Type: meltdown mitigation: PTI
Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via prctl and seccomp
           Type: spectre_v1 mitigation: __user pointer sanitization
Type: spectre_v2 mitigation: Full generic retpoline, IBPB, IBRS_FW Graphics: Device-1: Intel Core Processor Integrated Graphics vendor: Lenovo driver: i915 v: kernel bus ID: 00:02.0
           chip ID: 8086:0042
Display: x11 server: X.Org 1.20.3 driver: intel resolution: 1920x1080~60Hz OpenGL: renderer: Mesa DRI Intel Ironlake Desktop v: 2.1 Mesa 18.2.6 direct render: Yes Audio: Device-1: Intel 5 Series/3400 Series High Definition Audio vendor: Lenovo driver: snd_hda_intel v: kernel
           bus ID: 00:1b.0 chip ID: 8086:3b56
           Sound Server: ALSA v: k4.18.0-2-amd64
Network:   Device-1: Intel 82578DM Gigabit Network vendor: Lenovo

Can anyone help? Where should I look first.


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