我刚刚在 Raspberry pi 4 中更新了我的 Ubuntu 18。并且在 initrd 阶段未检测到 USB 设备。
我可以看到这些initramfs.conf集合MODULES=most以及 usb-storage 和 uas 模块都存在。
即使我从 initrd shell（dropbear）手动加载它们，也检测不到 USB 设备：
[ 1154.045506] usbcore: registered new interface driver usb-storage
[ 1154.050243] usbcore: registered new interface driver uas
典型输出如下：
[27568553.887498] usb 2-2: new SuperSpeed Gen 1 USB device number 2 using xhci_hcd
[27568553.908456] usb 2-2: New USB device found, idVendor=090c, idProduct=1000, bcdDevice=11.00
[27568553.908474] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[27568553.908486] usb 2-2: Product: Flash Drive FIT
[27568553.908497] usb 2-2: Manufacturer: Samsung
[27568553.908508] usb 2-2: SerialNumber: 0315218100002339
[27568554.092407] usb-storage 2-2:1.0: USB Mass Storage device detected
[27568554.092750] usb-storage 2-2:1.0: Quirks match for vid 090c pid 1000: 400
[27568554.092867] scsi host0: usb-storage 2-2:1.0
[27568554.093300] usbcore: registered new interface driver usb-storage
[27568554.101372] usbcore: registered new interface driver uas
[27568555.400291] scsi 0:0:0:0: Direct-Access Samsung Flash Drive FIT 1100 PQ: 0 ANSI: 6
[27568555.401496] sd 0:0:0:0: Attached scsi generic sg0 type 0
[27568555.402145] sd 0:0:0:0: [sda] 125313283 512-byte logical blocks: (64.2 GB/59.8 GiB)
[27568555.402372] sd 0:0:0:0: [sda] Write Protect is off
[27568555.402386] sd 0:0:0:0: [sda] Mode Sense: 43 00 00 00
[27568555.402614] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[27568555.424179] sd 0:0:0:0: [sda] Attached SCSI removable disk
此更新已禁用内核/initrd 中的某些功能，但我不知道是什么。
任何想法？