Black Lines on screen

Hi,
Today, there appears some strange black lines on my laptop screen when I switch to Intel GPU. Before switching I always use my NVIDIA GPU and It's OK. Below pics show the situation:
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WeChat%20Image_20190322110558
inxi output:

~/.config/awesome >>> inxi -Fxxx                                                                           ±[●●][master]
System:    Host: t430u Kernel: 4.19.12-1-ck-ivybridge x86_64 bits: 64 compiler: gcc v: 8.2.1 Desktop: Awesome 4.3 
           dm: LightDM 1.28.0 Distro: Manjaro Linux 
Machine:   Type: Laptop System: LENOVO product: 33519SC v: ThinkPad T430u serial: <root required> Chassis: type: 10 
           serial: <root required> 
           Mobo: LENOVO model: 33519SC v: Win8 STD PRC DPK TPG serial: <root required> UEFI: LENOVO 
           v: H6ET95WW (2.13 ) date: 10/23/2015 
Battery:   ID-1: BAT1 charge: 17.7 Wh condition: 17.7/46.8 Wh (38%) volts: 12.1/11.1 model: SANYO 45N1089 
           type: Li-poly serial:   611 status: Full 
CPU:       Topology: Dual Core model: Intel Core i5-3337U bits: 64 type: MT MCP arch: Ivy Bridge rev: 9 
           L2 cache: 3072 KiB 
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 14367 
           Speed: 798 MHz min/max: 800/2700 MHz Core speeds (MHz): 1: 799 2: 798 3: 798 4: 798 
Graphics:  Device-1: Intel 3rd Gen Core processor Graphics vendor: Lenovo driver: i915 v: kernel bus ID: 00:02.0 
           chip ID: 8086:0166 
           Device-2: NVIDIA GF117M [GeForce 610M/710M/810M/820M / GT 620M/625M/630M/720M] vendor: Lenovo 
           driver: vfio-pci v: 0.2 bus ID: 01:00.0 chip ID: 10de:1140 
           Display: x11 server: X.Org 1.20.4 driver: intel compositor: compton resolution: 1366x768~60Hz 
           OpenGL: renderer: Mesa DRI Intel Ivybridge Mobile v: 4.2 Mesa 18.3.4 compat-v: 3.0 direct render: Yes 
Audio:     Device-1: Intel 7 Series/C216 Family High Definition Audio vendor: Lenovo driver: snd_hda_intel v: kernel 
           bus ID: 00:1b.0 chip ID: 8086:1e20 
           Sound Server: ALSA v: k4.19.12-1-ck-ivybridge 
Network:   Device-1: Broadcom and subsidiaries BCM4313 802.11bgn Wireless Network Adapter driver: wl v: kernel 
           port: 5000 bus ID: 03:00.0 chip ID: 14e4:4727 
           IF: wlp3s0 state: up mac: a4:17:31:bf:1d:11 
           Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Lenovo driver: N/A port: 3000 
           bus ID: 09:00.0 chip ID: 10ec:8168 
           IF-ID-1: virbr0 state: down mac: ce:85:7c:e1:0b:c7 
           IF-ID-2: virbr0-nic state: down mac: 52:54:00:b5:fd:81 
           IF-ID-3: vmnet1 state: unknown speed: N/A duplex: N/A mac: 00:50:56:c0:00:01 
           IF-ID-4: vmnet8 state: unknown speed: N/A duplex: N/A mac: 00:50:56:c0:00:08 
Drives:    Local Storage: total: 1.14 TiB used: 423.57 GiB (36.4%) 
           ID-1: /dev/sda vendor: Western Digital model: WD10JPVT-08A1YT2 size: 931.51 GiB speed: 3.0 Gb/s 
           rotation: 5400 rpm serial: WD-WXB1A33A6831 rev: 1A01 scheme: GPT 
           ID-2: /dev/sdb vendor: Samsung model: SSD 860 EVO mSATA 250GB size: 232.89 GiB speed: 3.0 Gb/s 
           serial: S41MNC0K902146M rev: 1B6Q scheme: GPT 
Partition: ID-1: / size: 47.00 GiB used: 20.67 GiB (44.0%) fs: ext4 dev: /dev/sdb2 
           ID-2: /home size: 15.69 GiB used: 5.87 GiB (37.4%) fs: ext4 dev: /dev/sdb3 
Sensors:   System Temperatures: cpu: 43.0 C mobo: 36.0 C 
           Fan Speeds (RPM): cpu: 0 
Info:      Processes: 228 Uptime: 9m Memory: 7.69 GiB used: 1.19 GiB (15.5%) Init: systemd v: 241 Compilers: 
           gcc: 8.2.1 Shell: zsh v: 5.7.1 running in: urxvt inxi: 3.0.32

/etc/X11/xorg.conf.d/20-intel.conf:

##
## Generated by mhwd - Manjaro Hardware Detection
##
 
Section "Device"
    Identifier  "Device0"
    Driver      "intel"
    BusID       "PCI:0:2:0"
#    Option      "AccelMethod"  "uxa"
#    Option      "AccelMethod" "sna"
#    Option	"SwapbuffersWait" "true"
    Option      "TearFree" "true"
EndSection
 
#Section "Screen"
#    Identifier     "Screen0"
#    Device         "Device0"
#    DefaultDepth    24
#    SubSection     "Display"
#        Depth       24
#	Modes      "1366x768"
#    EndSubSection
#EndSection
 
#Section "Extensions"
#    Option "Composite" "Enable"
#    Option "RENDER"    "Enable"
#EndSection

I must conclude that somehow only you can see these black lines, or you must be more descriptive .. because I dont notice anything :woman_shrugging:

EDIT - ohp, there we are. those do look annoying.

Yeh, I edit the pics, thanks.
Edit: Sorry,disturb you, I just changed the BIOS settings about CSM support, if turn off it, will cause this problem.

Ok so now we need to understand how booting in legacy mode fixes gpu(?) issue.

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