Modemmanager 1.10 <info>无法检查对设备<info>的支持

Question

机器:宏碁Chromebook 14 CB3-431

试图编写udev规则来简单地忽略Intel无线7265 (双波段无线-AC 7265)

在引导时，modemmanager使用以下信息挂起引导过程：

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(很少不同的)规则，但没有成功：

KERNELS=="0000:02:00.0", ENV{ID_MM_DEVICE_IGNORE}="1"

规则被读取，但显然是不正确的，因为引导仍然挂起。

    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

Answer 1

这件事已经由Aleksander自己解决了。*邮寄名单上的摘要：

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?

有一次，似乎是MM挂起引导进程，因为一旦MM被删除，引导挂起也被删除。现在看来MM不是罪魁祸首！* ，我只想知道，MM是否有必要提供信息呢？

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