机器：宏碁 Chromebook 14 CB3-431
尝试编写 udev 规则以忽略板载 Intel Wireless 7265（双频 Wireless-AC 7265）
启动时，modemmanager 会挂起启动进程并显示以下信息：
Couldn't check support for device '/sys/devices/pci0000:00/0000:00:1c.2/0000:02:00.0' not supported by any plugin
信息：
# udevadm info -a -p /sys/class/net/wlp2s0
looking at device '/devices/pci0000:00/0000:00:1c.2/0000:02:00.0/net/wlp2s0':
KERNEL=="wlp2s0"
SUBSYSTEM=="net"
DRIVER==""
ATTR{carrier_changes}=="4"
ATTR{carrier}=="1"
ATTR{dev_id}=="0x0"
ATTR{carrier_down_count}=="2"
ATTR{proto_down}=="0"
ATTR{address}=="7c:b0:c2:d5:88:dd"
ATTR{operstate}=="up"
ATTR{link_mode}=="1"
ATTR{dormant}=="0"
ATTR{mtu}=="1500"
ATTR{gro_flush_timeout}=="0"
ATTR{carrier_up_count}=="2"
ATTR{ifalias}==""
ATTR{netdev_group}=="0"
ATTR{ifindex}=="2"
ATTR{broadcast}=="ff:ff:ff:ff:ff:ff"
ATTR{type}=="1"
ATTR{dev_port}=="0"
ATTR{name_assign_type}=="4"
ATTR{addr_assign_type}=="3"
ATTR{addr_len}=="6"
ATTR{tx_queue_len}=="1000"
ATTR{iflink}=="2"
ATTR{flags}=="0x1003"
looking at parent device '/devices/pci0000:00/0000:00:1c.2/0000:02:00.0':
KERNELS=="0000:02:00.0"
SUBSYSTEMS=="pci"
DRIVERS=="iwlwifi"
ATTRS{broken_parity_status}=="0"
ATTRS{subsystem_device}=="0x5010"
ATTRS{dma_mask_bits}=="36"
ATTRS{vendor}=="0x8086"
ATTRS{local_cpus}=="f"
ATTRS{class}=="0x028000"
ATTRS{numa_node}=="-1"
ATTRS{max_link_width}=="1"
ATTRS{msi_bus}=="1"
ATTRS{device}=="0x095a"
ATTRS{current_link_width}=="1"
ATTRS{max_link_speed}=="2.5 GT/s"
ATTRS{local_cpulist}=="0-3"
ATTRS{driver_override}=="(null)"
ATTRS{d3cold_allowed}=="1"
ATTRS{irq}=="313"
ATTRS{revision}=="0x59"
ATTRS{current_link_speed}=="2.5 GT/s"
ATTRS{consistent_dma_mask_bits}=="36"
ATTRS{ari_enabled}=="0"
ATTRS{devspec}==""
ATTRS{enable}=="1"
ATTRS{subsystem_vendor}=="0x8086"
looking at parent device '/devices/pci0000:00/0000:00:1c.2':
KERNELS=="0000:00:1c.2"
SUBSYSTEMS=="pci"
DRIVERS=="pcieport"
ATTRS{secondary_bus_number}=="2"
ATTRS{subordinate_bus_number}=="2"
ATTRS{broken_parity_status}=="0"
ATTRS{subsystem_device}=="0x7270"
ATTRS{dma_mask_bits}=="32"
ATTRS{vendor}=="0x8086"
ATTRS{local_cpus}=="f"
ATTRS{class}=="0x060400"
ATTRS{numa_node}=="-1"
ATTRS{max_link_width}=="1"
ATTRS{msi_bus}=="1"
ATTRS{device}=="0x22cc"
ATTRS{current_link_width}=="1"
ATTRS{max_link_speed}=="2.5 GT/s"
ATTRS{local_cpulist}=="0-3"
ATTRS{driver_override}=="(null)"
ATTRS{d3cold_allowed}=="1"
ATTRS{irq}=="311"
ATTRS{revision}=="0x35"
ATTRS{current_link_speed}=="2.5 GT/s"
ATTRS{consistent_dma_mask_bits}=="32"
ATTRS{ari_enabled}=="0"
ATTRS{devspec}==""
ATTRS{enable}=="1"
ATTRS{subsystem_vendor}=="0x8086"
looking at parent device '/devices/pci0000:00':
KERNELS=="pci0000:00"
SUBSYSTEMS==""
DRIVERS==""
我尝试为 udev 编写（一些不同的）规则，但没有成功：
KERNELS=="0000:02:00.0", ENV{ID_MM_DEVICE_IGNORE}="1"
该规则已读取，但显然不正确，因为启动仍然挂起
udevadm test /sys/class/net/wlp2s0 /snip/ created db file
'/run/udev/data/n2' for
'/devices/pci0000:00/0000:00:1c.2/0000:02:00.0/net/wlp2s0' ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1c.2/0000:02:00.0/net/wlp2s0
DEVTYPE=wlan ID_BUS=pci ID_MM_CANDIDATE=1 ID_MM_DEVICE_IGNORE=1
ID_MODEL_FROM_DATABASE=Wireless 7265 (Dual Band Wireless-AC 7265)
ID_MODEL_ID=0x095a ID_NET_NAME_PATH=wlp2s0
ID_PCI_CLASS_FROM_DATABASE=Network controller
ID_PCI_SUBCLASS_FROM_DATABASE=Network controller
ID_VENDOR_FROM_DATABASE=Intel Corporation ID_VENDOR_ID=0x8086
IFINDEX=2 INTERFACE=wlp2s0 SUBSYSTEM=net USEC_INITIALIZED=59063
答案1
Aleksander 本人已经解决了这个问题。 :) 邮件列表摘要：
Aleksander:
That is just an informative message. MM is not touching that interface for anything, it's just saying it cannot be used as part of a modem, as there is no control port. No udev rule to ignore the device will be hit, because MM is not even trying to use the device. That is definitely nothing to worry about.
Is MM really hanging the boot process? What exactly are you seeing? Any actual logs you can share?
有一段时间，确实看起来是MM挂起了启动进程，因为一旦MM被移除，启动挂起也被移除了。现在，看来MM不是罪魁祸首！*
现在，我只是想知道，MM到底有必要提供信息吗？
I think that message is not debug, and I agree that it may be a bit confusing to see it :D I'll see what I can do to silence those.
-- Aleksander