每当我尝试在 Kubuntu 18.04 中调整大小和平铺两个窗口时，我的屏幕就会冻结。为什么会这样？
在两个窗口之间切换也非常慢（使用 alt tab 或其他方式；整个过程都会冻结）
inxi -Fxxz
System: Host: konsole Kernel: 5.0.0-31-generic x86_64 bits: 64 gcc: 7.4.0
Desktop: KDE Plasma 5.12.9 (Qt 5.9.5) dm: sddm,sddm Distro: Ubuntu 18.04.3 LTS
Machine: Device: laptop System: Acer product: Aspire A515-51G v: V1.08 serial: N/A
Mobo: KBL model: Charmander_KL v: V1.08 serial: N/A UEFI [Legacy]: Insyde v: V1.08 date: 06/15/2017
Battery BAT1: charge: 44.6 Wh 100.0% condition: 44.6/48.9 Wh (91%) volts: 16.8/15.2
model: COMPAL PABAS0241231 serial: <filter>status: Full
CPU: Quad core Intel Core i5-8250U (-MT-MCP-) arch: Kaby Lake rev.10 cache: 6144 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 14400
clock speeds: min/max: 400/3400 MHz 1: 922 MHz 2: 1577 MHz 3: 2085 MHz 4: 1921 MHz 5: 2128 MHz
6: 2056 MHz 7: 1907 MHz 8: 1896 MHz
Graphics: Card-1: Intel UHD Graphics 620 bus-ID: 00:02.0 chip-ID: 8086:5917
Card-2: NVIDIA GP108M [GeForce MX150] bus-ID: 01:00.0 chip-ID: 10de:1d10
Display Server: x11 (X.Org 1.20.4 ) drivers: modesetting,nvidia (unloaded: fbdev,vesa,nouveau)
Resolution: [email protected]
OpenGL: renderer: GeForce MX150/PCIe/SSE2 version: 4.6.0 NVIDIA 390.116 Direct Render: Yes
Audio: Card Intel Sunrise Point-LP HD Audio driver: snd_hda_intel bus-ID: 00:1f.3 chip-ID: 8086:9d71
Sound: Advanced Linux Sound Architecture v: k5.0.0-31-generic
Network: Card-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
driver: r8169 port: 3000 bus-ID: 02:00.1 chip-ID: 10ec:8168
IF: enp2s0f1 state: down mac: <filter>
Card-2: Intel Dual Band Wireless-AC 3168NGW [Stone Peak]
driver: iwlwifi bus-ID: 03:00.0 chip-ID: 8086:24fb
IF: wlp3s0 state: up mac: <filter>
Drives: HDD Total Size: 1000.2GB (9.5% used)
ID-1: /dev/sda model: WDC_WD10SPZX size: 1000.2GB serial: <filter> temp: 42C
Partition: ID-1: / size: 46G used: 27G (62%) fs: ext4 dev: /dev/sda1
ID-2: /home size: 865G used: 57G (7%) fs: ext4 dev: /dev/sda2
ID-3: swap-1 size: 6.20GB used: 0.02GB (0%) fs: swap dev: /dev/sda3
RAID: System: supported: N/A
No RAID devices: /proc/mdstat, md_mod kernel module present
Unused Devices: none
Sensors: System Temperatures: cpu: 48.0C mobo: N/A gpu: 0.0:48C
Fan Speeds (in rpm): cpu: N/A
Info: Processes: 238 Uptime: 2:40 Memory: 2105.7/3817.4MB Init: systemd v: 237 runlevel: 5 Gcc sys: 7.4.0
Client: Shell (bash 4.4.201 running in konsole) inxi: 2.3.56