After disconnecting an external HDMI monitor without turning off the computer, it stopped working when logging in. The login session prompt displays fine, but once I log in, the KDE logo appears for a second then the display turns off. The desktop extends (I can see it in the workspaces thumbnails) but the monitor stays turned off.

I tried creating another user and it works fine there. So does the original user with XFCE.

I tried replacing `.config/plasmashellrc` and other files, a bit wildly and without really knowing what I was doing, but never got to fix it.

Any ideas on what may be going on and how to fix it?

Cheers.

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inxi --full --admin --verbosity=7 --filter --no-host
System:    Kernel: 5.8.11-1-MANJARO x86_64 bits: 64 compiler: N/A
           parameters: BOOT_IMAGE=/boot/vmlinuz-5.8-x86_64 root=UUID=8ad4c5a0-a095-4ad0-9e56-f777755bfc33 rw
           quiet udev.log_priority=3
           Desktop: KDE Plasma 5.19.5 tk: Qt 5.15.1 wm: kwin_x11 dm: LightDM 1.30.0 Distro: Manjaro Linux
Machine:   Type: Laptop System: LENOVO product: 20QNCTO1WW v: ThinkPad P53 serial: <filter> Chassis: type: 10
           serial: <filter>
           Mobo: LENOVO model: 20QNCTO1WW v: SDK0J40697 WIN serial: <filter> UEFI: LENOVO v: N2NET37W (1.22 )
           date: 04/28/2020
Battery:   ID-1: BAT0 charge: 82.8 Wh condition: 82.8/90.0 Wh (92%) volts: 12.8/11.2 model: Celxpert 5B10W13902
           type: Li-poly serial: <filter> status: Full cycles: 26
Memory:    RAM: total: 30.98 GiB used: 3.11 GiB (10.0%)
           RAM Report: permissions: Unable to run dmidecode. Root privileges required.
CPU:       Topology: 6-Core model: Intel Core i7-9850H bits: 64 type: MT MCP arch: Kaby Lake family: 6
           model-id: 9E (158) stepping: D (13) microcode: D6 L2 cache: 12.0 MiB bogomips: 62431
           Speed: 800 MHz min/max: 800/4600 MHz Core speeds (MHz): 1: 800 2: 800 3: 800 4: 801 5: 800 6: 800
           7: 800 8: 800 9: 802 10: 800 11: 800 12: 800
           Flags: 3dnowprefetch abm acpi adx aes aperfmperf apic arat arch_capabilities arch_perfmon art avx avx2
           bmi1 bmi2 bts clflush clflushopt cmov constant_tsc cpuid cpuid_fault cx16 cx8 de ds_cpl dtes64 dtherm
           dts epb ept ept_ad erms est f16c flexpriority flush_l1d fma fpu fsgsbase fxsr ht hwp hwp_act_window
           hwp_epp hwp_notify ibpb ibrs ibrs_enhanced ida intel_pt invpcid invpcid_single lahf_lm lm mca mce
           md_clear mmx monitor movbe mpx msr mtrr nonstop_tsc nopl nx pae pat pbe pcid pclmulqdq pdcm pdpe1gb
           pebs pge pln pni popcnt pse pse36 pts rdrand rdseed rdtscp rep_good sdbg sep smap smep smx ss ssbd sse
           sse2 sse4_1 sse4_2 ssse3 stibp syscall tm tm2 tpr_shadow tsc tsc_adjust tsc_deadline_timer vme vmx
           vnmi vpid x2apic xgetbv1 xsave xsavec xsaveopt xsaves xtopology xtpr
           Vulnerabilities: Type: itlb_multihit status: KVM: VMX disabled
           Type: l1tf status: Not affected
           Type: mds status: Not affected
           Type: meltdown status: Not affected
           Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via prctl and seccomp
           Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer sanitization
           Type: spectre_v2 mitigation: Enhanced IBRS, IBPB: conditional, RSB filling
           Type: srbds mitigation: TSX disabled
           Type: tsx_async_abort mitigation: TSX disabled
Graphics:  Device-1: Intel UHD Graphics 630 vendor: Lenovo driver: i915 v: kernel bus ID: 00:02.0
           chip ID: 8086:3e9b
           Device-2: NVIDIA TU106GLM [Quadro RTX 3000 Mobile / Max-Q] vendor: Lenovo driver: nvidia v: 440.100
           bus ID: 01:00.0 chip ID: 10de:1f36
           Device-3: IMC Networks Integrated Camera type: USB driver: uvcvideo bus ID: 1-8:3 chip ID: 13d3:56bc
           serial: <filter>
           Display: x11 server: X.Org 1.20.9 compositor: kwin_x11 driver: modesetting,nvidia display ID: :0
           screens: 1
           Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 507x285mm (20.0x11.2") s-diag: 582mm (22.9")
           Monitor-1: eDP-1-1 res: 1920x1080 dpi: 142 size: 344x194mm (13.5x7.6") diag: 395mm (15.5")
           OpenGL: renderer: Quadro RTX 3000/PCIe/SSE2 v: 4.6.0 NVIDIA 440.100 direct render: Yes
Audio:     Device-1: Intel Cannon Lake PCH cAVS vendor: Lenovo driver: snd_hda_intel v: kernel bus ID: 00:1f.3
           chip ID: 8086:a348
           Device-2: BEHRINGER type: USB driver: snd-usb-audio bus ID: 1-5.2:7 chip ID: 1397:0509
           Sound Server: ALSA v: k5.8.11-1-MANJARO
Network:   Device-1: Intel Ethernet I219-LM vendor: Lenovo driver: e1000e v: 3.2.6-k port: efa0 bus ID: 00:1f.6
           chip ID: 8086:15bb
           IF: enp0s31f6 state: down mac: <filter>
           Device-2: Intel Wi-Fi 6 AX200 driver: iwlwifi v: kernel port: 2000 bus ID: 52:00.0 chip ID: 8086:2723
           IF: wlp82s0 state: up mac: <filter>
           IP v4: <filter> type: dynamic noprefixroute scope: global broadcast: <filter>
           IP v6: <filter> type: noprefixroute scope: link
           WAN IP: <filter>
Drives:    Local Storage: total: 953.87 GiB used: 282.51 GiB (29.6%)
           SMART Message: Unable to run smartctl. Root privileges required.
           ID-1: /dev/nvme0n1 vendor: Western Digital model: PC SN730 SDBQNTY-1T00-1001 size: 953.87 GiB
           block size: physical: 512 B logical: 512 B speed: 31.6 Gb/s lanes: 4 serial: <filter> rev: 11130101
           scheme: GPT
           Message: No Optical or Floppy data was found.
RAID:      Message: No RAID data was found.
Partition: ID-1: / raw size: 452.84 GiB size: 444.74 GiB (98.21%) used: 282.48 GiB (63.5%) fs: ext4
           dev: /dev/nvme0n1p5 label: N/A uuid: 8ad4c5a0-a095-4ad0-9e56-f777755bfc33
           ID-2: /boot/efi raw size: 260.0 MiB size: 256.0 MiB (98.46%) used: 29.1 MiB (11.4%) fs: vfat
           dev: /dev/nvme0n1p1 label: SYSTEM uuid: 844C-1034
Swap:      Alert: No Swap data was found.
Unmounted: ID-1: /dev/nvme0n1p2 size: 16.0 MiB fs: <superuser/root required> label: N/A uuid: N/A
           ID-2: /dev/nvme0n1p3 size: 499.78 GiB fs: bitlocker label: N/A uuid: N/A
           ID-3: /dev/nvme0n1p4 size: 1000.0 MiB fs: ntfs label: WinRE_DRV uuid: F6964F7E964F3E7D
USB:       Hub: 1-0:1 info: Full speed (or root) Hub ports: 16 rev: 2.0 speed: 480 Mb/s chip ID: 1d6b:0002
           Hub: 1-5:2 info: Fresco Logic USB2.0 Hub ports: 5 rev: 2.1 speed: 480 Mb/s chip ID: 1d5c:5010
           Hub: 1-5.1:5 info: Genesys Logic Hub ports: 4 rev: 2.0 speed: 480 Mb/s chip ID: 05e3:0608
           Device-1: 1-5.1.3:8 info: Logitech Marble Mouse (4-button) type: Mouse driver: hid-generic,usbhid
           interfaces: 1 rev: 1.1 speed: 1.5 Mb/s chip ID: 046d:c408
           Hub: 1-5.1.4:10 info: Genesys Logic Hub ports: 4 rev: 2.0 speed: 480 Mb/s chip ID: 05e3:0608
           Device-1: 1-5.1.4.1:11 info: Apple Aluminium Keyboard (ISO) type: Keyboard,HID driver: apple,usbhid
           interfaces: 2 rev: 2.0 speed: 12 Mb/s chip ID: 05ac:0250 serial: <filter>
           Device-2: 1-5.2:7 info: BEHRINGER type: Audio driver: snd-usb-audio interfaces: 6 rev: 2.0
           speed: 480 Mb/s chip ID: 1397:0509
           Device-3: 1-5.3:9 info: Fresco Logic type: Billboard driver: N/A interfaces: 1 rev: 2.0 speed: 12 Mb/s
           chip ID: 1d5c:7102
           Device-4: 1-8:3 info: IMC Networks Integrated Camera type: Video driver: uvcvideo interfaces: 4
           rev: 2.0 speed: 480 Mb/s chip ID: 13d3:56bc serial: <filter>
           Device-5: 1-9:4 info: Synaptics Prometheus MIS Touch Fingerprint Reader type: <vendor specific>
           driver: N/A interfaces: 1 rev: 2.0 speed: 12 Mb/s chip ID: 06cb:00bd serial: <filter>
           Device-6: 1-11:6 info: Alcor Micro AU9540 Smartcard Reader type: Smart Card driver: N/A interfaces: 1
           rev: 2.0 speed: 12 Mb/s chip ID: 058f:9540
           Hub: 2-0:1 info: Full speed (or root) Hub ports: 10 rev: 3.1 speed: 10 Gb/s chip ID: 1d6b:0003
           Hub: 5-0:1 info: Full speed (or root) Hub ports: 2 rev: 2.0 speed: 480 Mb/s chip ID: 1d6b:0002
           Hub: 6-0:1 info: Full speed (or root) Hub ports: 2 rev: 3.1 speed: 10 Gb/s chip ID: 1d6b:0003
           Hub: 6-2:2 info: Fresco Logic USB3.0 Hub ports: 4 rev: 3.0 speed: 5 Gb/s chip ID: 1d5c:5000
Sensors:   System Temperatures: cpu: 56.0 C mobo: 36.0 C gpu: nvidia temp: 37 C
           Fan Speeds (RPM): cpu: 1838
Info:      Processes: 311 Uptime: 8h 03m Init: systemd v: 246 Compilers: gcc: 10.2.0 clang: 10.0.1 Packages:
           pacman: 1669 lib: 475 Shell: Bash v: 5.0.18 running in: xfce4-terminal inxi: 3.1.05

I managed to make it work manually with

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xrandr --output DP-1 --auto --left-of eDP-1-1

This seems to solve the problem permanently.

Thanks for this. I had the very same problem with KDE neon. The second monitor irregularly would come up and down, and then finally just stopped working. Oddly, it works fine if I switch to wayland (though of course there are the other wayland issues), but using X11, the monitor was just gone. This occurred for me right after my last set up upgrades. The xrandr fix worked great!

billo