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Suncatcher
Asked: 2018-08-20 02:01:28 +0800 CST

Identify module name to blacklist

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Everybody knows that any kernel module can be blacklisted via GRUB line:

$ module_name.blacklist=yes

However, not everybody knows the exact name of module to blacklist. And that is the real problem! How to identify it?

For example, during of loading of GRUB I see:

rtlwifi firmware not available

which is quite useless of identification. Neither

rtlwifi.blacklist=yes

nor any other variants worked. How do I figure out the name?

The same thing goes with Bluetooth adapter. It throws:

 [ 9.366503] Bluethooth: hci0: Failed to load rtl_bt/rtl8821a_fw.bin

Of course, rtl_bt/rt18821a_fw.blacklist=yes didn't work.

$ lsmod | grep rtl 
rtl8821ae             233472  0
btcoexist             131072  1 rtl8821ae
rtl_pci                32768  1 rtl8821ae
btrtl                  16384  1 btusb
bluetooth             548864  5 btrtl,btintel,btbcm,btusb
rtlwifi                77824  3 rtl_pci,btcoexist,rtl8821ae
mac80211              778240  3 rtl_pci,rtlwifi,rtl8821ae
cfg80211              622592  2 mac80211,rtlwifi

Any suggestions?

UPDATE: What concerns rtlwifi error lspci -v listed only following

Network controller: Realtek Semiconductor Co., Ltd. RTL8821AE 802.11ac PCIe Wireless Network Adapter
Subsystem: ASUSTeK Computer Inc. RTL8821AE 802.11ac PCIe Wireless Network Adapter
Flags: bus master, fast devsel, latency 0, IRQ 29
I/O ports at e000 [size=256]
Memory at f7d00000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Device Serial Number 00-e0-4c-ff-fe-87-2b-01
Capabilities: [150] Latency Tolerance Reporting
Capabilities: [158] L1 PM Substates
Kernel driver in use: rtl8821ae
Kernel modules: rtl8821ae

And name rtl8821ae already was in my blacklist without any result, so it seems to be no-go.

What concerns Bluethooth: hci0 error, lspci listed no Bluetooth modules or nothing similar to rtl_bt, maybe because Bluetooth adapter is not a PCI device.

grub2 drivers kernel blacklist

1 Answers

  1. You can boot without blacklisting the driver and then use lspci -v to display the information about the hardware and the kernel driver and module associated with it. The Kernel Modules: section should show module name you need to blacklist (most likely)

    Sample output:

    00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03)
    Subsystem: Red Hat, Inc Qemu virtual machine
    Flags: medium devsel, IRQ 9
    Kernel driver in use: piix4_smbus
    Kernel modules: i2c_piix4

    Module name in above example is i2c_piix4

    Let me know if that works. Source of this info is https://askubuntu.com/a/110343/142100

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