笔记本型号：联想小新Air14-2021

操作系统版本：社区版（20.6）

硬件信息：

Machine:   Type: Laptop System: LENOVO product: 82LM v: Lenovo XiaoXinAir 14ALC 2021 serial:  
           Mobo: LENOVO model: LNVNB161216 v: SDK0L77769 WIN serial:  UEFI: LENOVO v: G5CN15WW(V1.03) 
           date: 01/04/2021 
Battery:   ID-1: BAT1 charge: 50.5 Wh condition: 52.4/56.5 Wh (93%) 
CPU:       Topology: 6-Core model: AMD Ryzen 5 5500U with Radeon Graphics bits: 64 type: MT MCP L2 cache: 3072 KiB 
           Speed: 1298 MHz min/max: 1400/2100 MHz Core speeds (MHz): 1: 1389 2: 1381 3: 1460 4: 1478 5: 1402 6: 1404 7: 1393 
           8: 1395 9: 1439 10: 1424 11: 1373 12: 1336 
Graphics:  Device-1: Advanced Micro Devices [AMD/ATI] driver: amdgpu v: kernel 
           Display: x11 server: X.Org 1.20.11 driver: amdgpu,ati unloaded: fbdev,modesetting,vesa resolution: 2560x1440~60Hz 
           OpenGL: renderer: AMD RENOIR (DRM 3.40.0 5.10.101-amd64-desktop LLVM 11.0.1) v: 4.6 Mesa 20.3.4 
Audio:     Device-1: Advanced Micro Devices [AMD/ATI] driver: snd_hda_intel 
           Device-2: Advanced Micro Devices [AMD] Raven/Raven2/FireFlight/Renoir Audio Processor driver: snd_rn_pci_acp3x 
           Device-3: Advanced Micro Devices [AMD] Family 17h HD Audio driver: snd_hda_intel 
           Sound Server: ALSA v: k5.10.101-amd64-desktop 
Network:   Device-1: Intel Wi-Fi 6 AX200 driver: iwlwifi 
           IF: wlo1 state: up mac: d0:3c:1f:0f:25:d0 
           IF-ID-1: br-55775528a6f9 state: down mac: 02:42:9f:b0:48:60 
           IF-ID-2: br-6bf94aa4ef85 state: down mac: 02:42:83:1c:77:4b 
           IF-ID-3: docker0 state: down mac: 02:42:6c:4a:2d:57 
           IF-ID-4: uengine0 state: up speed: 10000 Mbps duplex: unknown mac: d2:d4:19:bb:fe:e1 
           IF-ID-5: vethCMEI2C state: up speed: 10000 Mbps duplex: full mac: fe:8a:10:7c:d9:12 
Drives:    Local Storage: total: 2.29 TiB used: 493.83 GiB (21.1%) 
           ID-1: /dev/nvme0n1 vendor: Western Digital model: PC SN730 SDBPNTY-512G-1101 size: 476.94 GiB 
           ID-2: /dev/sda type: USB vendor: Toshiba model: MQ04ABD200 size: 1.82 TiB

问题现象：笔记本电脑不接外置显示器，自身启动大部分时候都没有问题，可以直接进入系统登录界面，笔记本自身声卡正常，有声音输出。

但外接显示器时（显卡输出接口为HDMI），笔记本启动后，跳过引导菜单，很多时候会直接黑屏很久，没有反应，等待了10分钟都没有达到登录界面。有时候可直接进入操作系统登录界面。同时外接显示器，声音输出选择HDMI输出，接在显示器上的音箱没有声音输出（我Windows的电脑HDMI输出音箱有声音输出）。这些问题在升级到20.6之前都没有出现过。