Today I updated all my applications after a quite long time running pacman -Syu, pamac update -a and snap refresh. Everything went fine so far, but now my external display keeps disconnecting when opening some specific applications (such as IntelliJ Idea) or performing some actions (for example watching a video, pretty much everything that needs some performance). After a few seconds the display will re-connect, but then disconnect again the next time an application is opened / some actions are performed.
This screen is connected via USB-C Adapter (HDMI). My other external screen that is connected just via HDMI has no problem at all. If I connect the working screen to the USB-C adapter it will show the same behavior. So something about the USB-C connection might be off.
I read through some threads and added i915.enable_psr=0 to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub (and ran sudo update-grub), which did not change anything.
I also switched my Kernel back to 5.10 which did not help.
At this point I do not know what to do further, any help would be appreciated 
Here is my inxi -v 8:
System:
Host: user-20tkcto1ww Kernel: 6.6.32-1-MANJARO arch: x86_64 bits: 64
compiler: gcc v: 14.1.1 clocksource: tsc avail: acpi_pm
parameters: BOOT_IMAGE=/boot/vmlinuz-6.6-x86_64
root=UUID=685581e0-90e4-41a1-9b03-2048bbd47b51 rw quiet apparmor=1
security=apparmor resume=UUID=8547ee52-7589-4144-9d7a-aaaa797ee96a
udev.log_priority=3 i915.enable_psr=0
Desktop: KDE Plasma v: 6.0.5 tk: Qt v: N/A info: frameworks v: 6.2.0
wm: kwin_x11 vt: 2 dm: SDDM Distro: Manjaro base: Arch Linux
Machine:
Type: Laptop System: LENOVO product: 20TKCTO1WW v: ThinkPad X1 Extreme Gen 3
serial: <superuser required> Chassis: type: 10 serial: <superuser required>
Mobo: LENOVO model: 20TKCTO1WW v: SDK0J40697 WIN
serial: <superuser required> part-nu: LENOVO_MT_20TK_BU_Think_FM_ThinkPad
X1 Extreme Gen 3 uuid: <superuser required> UEFI: LENOVO
v: N2VET30W (1.15 ) date: 04/15/2021
Battery:
ID-1: BAT0 charge: 65.1 Wh (100.0%) condition: 65.1/80.4 Wh (81.0%)
volts: 17.1 min: 15.4 model: SMP 5B10X19049 type: Li-poly serial: 16
status: full cycles: 168
Memory:
System RAM: total: 32 GiB available: 30.98 GiB used: 12.67 GiB (40.9%)
Message: For most reliable report, use superuser + dmidecode.
Array-1: capacity: 32 GiB slots: 2 modules: 1 EC: None
max-module-size: 32 GiB note: est.
Device-1: ChannelA-DIMM0 type: DDR4 detail: synchronous size: 32 GiB
speed: spec: 3200 MT/s actual: 2933 MT/s volts: curr: 1 width (bits):
data: 64 total: 64 manufacturer: Samsung part-no: M471A4G43AB1-CWE
serial: 03E4FC6A
Device-2: ChannelB-DIMM0 type: no module installed
PCI Slots:
Permissions: Unable to run dmidecode. Root privileges required.
CPU:
Info: model: Intel Core i7-10850H bits: 64 type: MT MCP arch: Comet Lake
gen: core 10 level: v3 note: check built: 2020 process: Intel 14nm family: 6
model-id: 0xA5 (165) stepping: 2 microcode: 0xFA
Topology: cpus: 1x cores: 6 tpc: 2 threads: 12 smt: enabled cache:
L1: 384 KiB desc: d-6x32 KiB; i-6x32 KiB L2: 1.5 MiB desc: 6x256 KiB
L3: 12 MiB desc: 1x12 MiB
Speed (MHz): avg: 800 min/max: 800/5100 scaling: driver: intel_pstate
governor: powersave cores: 1: 800 2: 800 3: 800 4: 800 5: 800 6: 800 7: 800
8: 800 9: 800 10: 800 11: 800 12: 800 bogomips: 64821
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 lahf_lm lm mca mce md_clear mmx
monitor movbe mpx msr mtrr nonstop_tsc nopl nx ospke pae pat pbe pcid
pclmulqdq pdcm pdpe1gb pebs pge pku pln pni popcnt pse pse36 pts rdrand
rdseed rdtscp rep_good sdbg sep sgx sgx_lc 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: gather_data_sampling mitigation: Microcode
Type: itlb_multihit status: KVM: VMX disabled
Type: l1tf status: Not affected
Type: mds status: Not affected
Type: meltdown status: Not affected
Type: mmio_stale_data mitigation: Clear CPU buffers; SMT vulnerable
Type: reg_file_data_sampling status: Not affected
Type: retbleed mitigation: Enhanced IBRS
Type: spec_rstack_overflow status: Not affected
Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via
prctl
Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer
sanitization
Type: spectre_v2 mitigation: Enhanced / Automatic IBRS; IBPB:
conditional; RSB filling; PBRSB-eIBRS: SW sequence; BHI: SW loop, KVM: SW
loop
Type: srbds mitigation: Microcode
Type: tsx_async_abort status: Not affected
Graphics:
Device-1: Intel CometLake-H GT2 [UHD Graphics] vendor: Lenovo driver: i915
v: kernel arch: Gen-9.5 process: Intel 14nm built: 2016-20 ports:
active: DP-1,DP-2 off: eDP-1 empty: DP-3 bus-ID: 00:02.0
chip-ID: 8086:9bc4 class-ID: 0300
Device-2: USB C Video Adaptor driver: N/A type: USB rev: 2.0
speed: 12 Mb/s lanes: 1 mode: 1.1 bus-ID: 1-5.4:5 chip-ID: 9636:9311
class-ID: 1100 serial: 000000000001
Device-3: IMC Networks Integrated Camera driver: uvcvideo type: USB
rev: 2.0 speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 1-8:6 chip-ID: 13d3:5405
class-ID: fe01 serial: 0000
Display: x11 server: X.Org v: 21.1.13 with: Xwayland v: 24.1.0
compositor: kwin_x11 driver: X: loaded: modesetting alternate: fbdev,vesa
dri: iris gpu: i915 display-ID: :0 screens: 1
Screen-1: 0 s-res: 2560x1080 s-dpi: 96 s-size: 676x285mm (26.61x11.22")
s-diag: 734mm (28.88")
Monitor-1: DP-1 pos: primary,left model: Acer XF240H serial: T4YEE0014200
built: 2015 res: 1920x1080 hz: 60 dpi: 92 gamma: 1.2 chroma: red: x: 0.647
y: 0.329 green: x: 0.310 y: 0.620 blue: x: 0.153 y: 0.071 white: x: 0.314
y: 0.329 size: 531x299mm (20.91x11.77") diag: 609mm (24") ratio: 16:9
modes: 1920x1080, 1920x1080i, 1680x1050, 1280x1024, 1440x900, 1280x960,
1280x800, 1152x864, 1280x720, 1024x768, 800x600, 720x576, 720x480,
640x480, 720x400
Monitor-2: DP-2 pos: right model: Samsung U32J59x serial: H4LR900250
built: 2021 res: 640x480 dpi: 23 gamma: 1.2 chroma: red: x: 0.686 y: 0.310
green: x: 0.259 y: 0.686 blue: x: 0.149 y: 0.059 white: x: 0.314 y: 0.329
size: 697x392mm (27.44x15.43") diag: 800mm (31.5") ratio: 16:9
modes: 3840x2160, 2560x1440, 1920x1080, 1680x1050, 1600x900, 1280x1024,
1440x900, 1280x800, 1152x864, 1280x720, 1024x768, 832x624, 800x600,
720x480, 640x480, 720x400
EDID-Warnings: 1: parse_edid: unhandled CEA mode 95 2: parse_edid:
unhandled CEA mode 95 3: parse_edid: unhandled CEA mode 95 4: parse_edid:
unhandled CEA mode 95 5: parse_edid: unhandled CEA mode 93 6: parse_edid:
unhandled CEA mode 94
Monitor-3: eDP-1 note: disabled model: BOE Display 0x08ec built: 2019
res: 640x480 dpi: 279 gamma: 1.2 chroma: red: x: 0.639 y: 0.329 green:
x: 0.208 y: 0.710 blue: x: 0.149 y: 0.059 white: x: 0.314 y: 0.329
size: 344x194mm (13.54x7.64") diag: 398mm (15.7") ratio: 16:9
modes: 3840x2160
EDID-Warnings: 1: parse_edid: unknown flag 0
API: EGL v: 1.5 hw: drv: intel iris platforms: device: 0 drv: iris
device: 1 drv: swrast surfaceless: drv: iris x11: drv: iris
inactive: gbm,wayland
API: OpenGL v: 4.6 compat-v: 4.5 vendor: intel mesa v: 24.0.9-manjaro1.1
glx-v: 1.4 direct-render: yes renderer: Mesa Intel UHD Graphics (CML GT2)
device-ID: 8086:9bc4 memory: 30.25 GiB unified: yes
API: Vulkan v: 1.3.279 layers: N/A device: 0 type: integrated-gpu
name: Intel UHD Graphics (CML GT2) driver: mesa intel v: 24.0.9-manjaro1.1
device-ID: 8086:9bc4 surfaces: xcb,xlib
Audio:
Device-1: Intel Comet Lake PCH cAVS vendor: Lenovo
driver: sof-audio-pci-intel-cnl alternate: snd_hda_intel, snd_soc_skl,
snd_sof_pci_intel_cnl bus-ID: 00:1f.3 chip-ID: 8086:06c8 class-ID: 0401
API: ALSA v: k6.6.32-1-MANJARO status: kernel-api with: aoss
type: oss-emulator tools: alsactl,alsamixer,amixer
Server-1: JACK v: 1.9.22 status: off tools: N/A
Server-2: PipeWire v: 1.0.7 status: active with: 1: pipewire-pulse
status: active 2: pipewire-media-session status: active 3: pipewire-alsa
type: plugin tools: pactl,pw-cat,pw-cli
Network:
Device-1: Intel Comet Lake PCH CNVi WiFi driver: iwlwifi v: kernel
bus-ID: 00:14.3 chip-ID: 8086:06f0 class-ID: 0280
IF: wlp0s20f3 state: up mac: 68:54:5a:68:87:65
IP v4: 192.168.0.129/24 type: dynamic noprefixroute scope: global
broadcast: 192.168.0.255
IP v6: 2a02:8388:6282:6980:99d9:e9c2:37c:3c66/64
type: dynamic noprefixroute scope: global
IP v6: fe80::cfff:6815:d2b0:d50e/64 type: noprefixroute scope: link
Device-2: ASUSTek ROG KERIS WIRELESS driver: hid-generic,usbhid type: USB
rev: 2.0 speed: 12 Mb/s lanes: 1 mode: 1.1 bus-ID: 1-6:4 chip-ID: 0b05:1960
class-ID: 0301
IF-ID-1: br-6cc02f881015 state: up speed: 10000 Mbps duplex: unknown
mac: 02:42:69:1f:ac:f6
IP v4: 172.21.0.1/16 scope: global broadcast: 172.21.255.255
IP v6: fe80::42:69ff:fe1f:acf6/64 virtual: proto kernel_ll scope: link
IF-ID-2: docker0 state: down mac: 02:42:5e:a1:4a:62
IP v4: 172.17.0.1/16 scope: global broadcast: 172.17.255.255
IF-ID-3: veth23327fe state: up speed: 10000 Mbps duplex: full
mac: 9a:f1:11:cb:af:d7
Info: services: NetworkManager, systemd-timesyncd, wpa_supplicant
WAN IP: 84.115.216.37
Bluetooth:
Device-1: Intel AX201 Bluetooth driver: btusb v: 0.8 type: USB rev: 2.0
speed: 12 Mb/s lanes: 1 mode: 1.1 bus-ID: 1-14:8 chip-ID: 8087:0026
class-ID: e001
Report: rfkill ID: hci0 rfk-id: 2 state: up address: see --recommends
Logical:
Message: No logical block device data found.
RAID:
Message: No RAID data found.
Drives:
Local Storage: total: 953.87 GiB used: 134.47 GiB (14.1%)
SMART Message: Unable to run smartctl. Root privileges required.
ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Toshiba model: N/A
size: 953.87 GiB block-size: physical: 512 B logical: 512 B speed: 31.6 Gb/s
lanes: 4 tech: SSD serial: X0EF73BHFPZ1 fw-rev: 5108AGLA temp: 44.9 C
scheme: GPT
Message: No optical or floppy data found.
Partition:
ID-1: / raw-size: 59.61 GiB size: 58.37 GiB (97.93%) used: 48.6 GiB (83.3%)
fs: ext4 dev: /dev/nvme0n1p7 maj-min: 259:7 label: N/A
uuid: 685581e0-90e4-41a1-9b03-2048bbd47b51
ID-2: /boot/efi raw-size: 512 MiB size: 511 MiB (99.80%)
used: 292 KiB (0.1%) fs: vfat dev: /dev/nvme0n1p5 maj-min: 259:5
label: NO_LABEL uuid: AA19-C1D5
ID-3: /home raw-size: 206.47 GiB size: 202.17 GiB (97.92%)
used: 85.82 GiB (42.5%) fs: ext4 dev: /dev/nvme0n1p8 maj-min: 259:8
label: N/A uuid: 9dd5aa61-94bf-4d8a-8a35-0ec3dc8ed48d
Swap:
Kernel: swappiness: 60 (default) cache-pressure: 100 (default) zswap: yes
compressor: zstd max-pool: 20%
ID-1: swap-1 type: partition size: 14.9 GiB used: 52.5 MiB (0.3%)
priority: -2 dev: /dev/nvme0n1p6 maj-min: 259:6 label: N/A
uuid: 8547ee52-7589-4144-9d7a-aaaa797ee96a
Unmounted:
ID-1: /dev/nvme0n1p1 maj-min: 259:1 size: 260 MiB fs: vfat label: SYSTEM
uuid: F816-5F11
ID-2: /dev/nvme0n1p2 maj-min: 259:2 size: 16 MiB fs: <superuser required>
label: N/A uuid: N/A
ID-3: /dev/nvme0n1p3 maj-min: 259:3 size: 573.49 GiB fs: bitlocker
label: N/A uuid: N/A
ID-4: /dev/nvme0n1p4 maj-min: 259:4 size: 1000 MiB fs: ntfs
label: WinRE_DRV uuid: E8DE190EDE18D6A2
USB:
Hub-1: 1-0:1 info: hi-speed hub with single TT ports: 16 rev: 2.0
speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 chip-ID: 1d6b:0002
class-ID: 0900
Device-1: 1-1:2 info: Logitech Logi Bolt Receiver type: keyboard,mouse,HID
driver: hid-generic,usbhid interfaces: 3 rev: 2.0 speed: 12 Mb/s (1.4 MiB/s)
lanes: 1 mode: 1.1 power: 98mA chip-ID: 046d:c548 class-ID: 0300
Hub-2: 1-5:3 info: Genesys Logic Hub ports: 4 rev: 2.1
speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 power: 100mA
chip-ID: 05e3:0610 class-ID: 0900
Device-1: 1-5.4:5 info: USB C Video Adaptor type: billboard driver: N/A
interfaces: 1 rev: 2.0 speed: 12 Mb/s (1.4 MiB/s) lanes: 1 mode: 1.1
chip-ID: 9636:9311 class-ID: 1100 serial: 000000000001
Device-2: 1-6:4 info: ASUSTek ROG KERIS WIRELESS type: HID,mouse,keyboard
driver: hid-generic,usbhid interfaces: 3 rev: 2.0 speed: 12 Mb/s (1.4 MiB/s)
lanes: 1 mode: 1.1 power: 100mA chip-ID: 0b05:1960 class-ID: 0301
Device-3: 1-8:6 info: IMC Networks Integrated Camera type: video
driver: uvcvideo interfaces: 5 rev: 2.0 speed: 480 Mb/s (57.2 MiB/s)
lanes: 1 mode: 2.0 power: 500mA chip-ID: 13d3:5405 class-ID: fe01
serial: 0000
Device-4: 1-9:7 info: Synaptics Prometheus MIS Touch Fingerprint Reader
type: <vendor specific> driver: N/A interfaces: 1 rev: 2.0
speed: 12 Mb/s (1.4 MiB/s) lanes: 1 mode: 1.1 power: 100mA
chip-ID: 06cb:00bd class-ID: ff00 serial: 77164ed87336
Device-5: 1-14:8 info: Intel AX201 Bluetooth type: bluetooth driver: btusb
interfaces: 2 rev: 2.0 speed: 12 Mb/s (1.4 MiB/s) lanes: 1 mode: 1.1
power: 100mA chip-ID: 8087:0026 class-ID: e001
Hub-3: 2-0:1 info: super-speed hub ports: 10 rev: 3.1
speed: 10 Gb/s (1.16 GiB/s) lanes: 1 mode: 3.2 gen-2x1 chip-ID: 1d6b:0003
class-ID: 0900
Hub-4: 3-0:1 info: hi-speed hub with single TT ports: 2 rev: 2.0
speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 chip-ID: 1d6b:0002
class-ID: 0900
Hub-5: 4-0:1 info: super-speed hub ports: 2 rev: 3.1
speed: 10 Gb/s (1.16 GiB/s) lanes: 1 mode: 3.2 gen-2x1 chip-ID: 1d6b:0003
class-ID: 0900
Hub-6: 4-2:2 info: Genesys Logic Hub ports: 4 rev: 3.2
speed: 5 Gb/s (596.0 MiB/s) lanes: 1 mode: 3.2 gen-1x1 chip-ID: 05e3:0626
class-ID: 0900
Sensors:
System Temperatures: cpu: 38.0 C pch: 58.0 C mobo: N/A
Fan Speeds (rpm): fan-1: 4658 fan-2: 4414
Repos:
Packages: 1663 pm: pacman pkgs: 1643 libs: 440 tools: pamac,yay pm: appimage
pkgs: 0 pm: flatpak pkgs: 0 pm: snap pkgs: 20
Active pacman repo servers in: /etc/pacman.d/mirrorlist
1: https://mirror.easyname.at/manjaro/stable/$repo/$arch
Processes:
CPU top: 5 of 398
1: cpu: 28.2% command: java pid: 3120 mem: 4547.2 MiB (14.3%)
2: cpu: 21.6% command: firefox pid: 3568 mem: 567.6 MiB (1.7%)
3: cpu: 11.9% command: firefox pid: 5638 mem: 257.7 MiB (0.8%)
4: cpu: 4.6% command: Xorg pid: 1640 mem: 93.8 MiB (0.2%)
5: cpu: 4.3% command: kwin_x11 pid: 2444 mem: 197.4 MiB (0.6%)
Memory top: 5 of 398
1: mem: 4547.2 MiB (14.3%) command: java pid: 3120 cpu: 28.2%
2: mem: 1243.5 MiB (3.9%) command: pamac-manager pid: 5561 cpu: 1.2%
3: mem: 567.6 MiB (1.7%) command: firefox pid: 3568 cpu: 21.6%
4: mem: 421.8 MiB (1.3%) command: brave pid: 6303 cpu: 4.2%
5: mem: 393.2 MiB (1.2%) command: brave pid: 6571 cpu: 4.1%
Info:
Processes: 398 Power: uptime: 18m states: freeze,mem,disk suspend: s2idle
avail: deep wakeups: 0 hibernate: platform avail: shutdown, reboot,
suspend, test_resume image: 12.38 GiB services: org_kde_powerdevil,upowerd
Init: systemd v: 255 default: graphical tool: systemctl
Compilers: clang: 17.0.6 gcc: 14.1.1 Shell: Bash v: 5.2.26
running-in: hyper inxi: 3.3.34
The output of unplugging and plugin in again (journalctl -fk)
usb 1-5: USB disconnect, device number 9
usb 1-5.4: USB disconnect, device number 10
usb 4-2: USB disconnect, device number 3
usb 1-4: new high-speed USB device number 11 using xhci_hcd
usb 4-1: new SuperSpeed USB device number 4 using xhci_hcd
usb 4-1: New USB device found, idVendor=05e3, idProduct=0626, bcdDevice= 6.5sb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 4-1: Product: USB3.1 Hub
usb 4-1: Manufacturer: GenesysLogic
hub 4-1:1.0: USB hub found
hub 4-1:1.0: 4 ports detected
usb 1-4: New USB device found, idVendor=05e3, idProduct=0610, bcdDevice= 6.55
usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 1-4: Product: USB2.1 Hub
usb 1-4: Manufacturer: GenesysLogic
hub 1-4:1.0: USB hub found
hub 1-4:1.0: 4 ports detected
usb 1-4.4: new full-speed USB device number 12 using xhci_hcd
usb 1-4.4: not running at top speed; connect to a high speed hub
usb 1-4.4: New USB device found, idVendor=9636, idProduct=9311, bcdDevice= 2.01
usb 1-4.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-4.4: Product: USB C Video Adaptor
usb 1-4.4: Manufacturer: USB C
usb 1-4.4: SerialNumber: 000000000001
If any further output is needed just let me know.
Edit: This topic closed automatically. Thanks for your help @Olli & @linux-aarhus. I tried using a different USB-C adaptor and everything is working fine now 