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122 lines
4.2 KiB
Markdown
122 lines
4.2 KiB
Markdown
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---
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layout: doc
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title: Wireless Troubleshooting
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permalink: /doc/wireless-troubleshooting/
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redirect_from:
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- /en/doc/wireless-troubleshooting/
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---
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Wireless Troubleshooting Guide
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==============================
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These instructions may help with suspend/resume issues for more devices than just wireless cards, that is just the (unfortunately not uncommon) example used here.
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Resetting wireless cards by reloading drivers
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---------------------------------------------
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If your wireless card works, but after suspending and resuming your computer, the Network-Manager applet just says "Device not ready", then try un-loading and re-loading the driver.
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### Determining your wireless card driver ###
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First, determine which kernel module corresponds to your wireless card. There are several ways to do this.
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The easiest is via the output of `lspci -k` in your sys-net VM:
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~~~
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[user@sys-net ~]$ lspci -k
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00:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a)
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Subsystem: Intel Corporation Device 0130
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Kernel driver in use: iwlwifi
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Kernel modules: iwlwifi
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~~~
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Here we see that the machine in question has an Intel wireless card, being used by the `iwlwifi` kernel module.
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### Checking logs for relevant messages ###
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View the output of `dmesg` in sys-net, and check if you see a bunch of wireless related errors. Depending on your hardware, they may look like the following (or not):
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~~~
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iwlwifi 0000:00:00.0: loaded firmware version 16.242414.0 op_mode iwlmvm
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iwlwifi 0000:00:00.0: Detected Intel(R) Dual Band Wireless AC 8260, REV=0x208
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...
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IPv6: ADDRCONF(NETDEV_UP): wlp0s0: link is not ready
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iwlwifi 0000:00:00.0: L1 Enabled - LTR Enabled
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iwlwifi 0000:00:00.0: L1 Enabled - LTR Enabled
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iwlwifi 0000:00:00.0: Failed to load firmware chunk!
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iwlwifi 0000:00:00.0: Could not load the [0] uCode section
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iwlwifi 0000:00:00.0: Failed to start INIT ucode: -110
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iwlwifi 0000:00:00.0: Failed to run INIT ucode: -110
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...
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iwlwifi 0000:00:00.0: Direct firmware load for iwlwifi-8000C-18.ucode failed with error -2
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~~~
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### Seeing what modules you have loaded ###
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You can check which drivers are currently loaded with `lsmod`, and view details about a module with `modinfo <module_name>`.
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For example, we list what modules we have loaded:
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~~~
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[user@sys-net ~]$ lsmod
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Module Size Used by
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iwlmvm 315392 0
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iwlwifi 155648 1 iwlmvm
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mac80211 708608 1 iwlmvm
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cfg80211 557056 3 iwlwifi,mac80211,iwlmvm
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...
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~~~
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and check one:
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~~~
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[user@sys-net ~]$ modinfo iwlmvm | grep -E '^(description|author|depends):'
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author: Copyright(c) 2003- 2015 Intel Corporation <ilw@linux.intel.com>
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description: The new Intel(R) wireless AGN driver for Linux
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depends: iwlwifi,mac80211,cfg80211
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~~~
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Hey, it's our wireless driver!
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Now, check if reloading the module makes wireless work again:
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~~~
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[user@sys-net ~]$ sudo rmmod iwlmvm
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[user@sys-net ~]$ sudo modprobe iwlmvm
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~~~
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and try reconnecting to a network that is known to work.
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If that is successful, see below about having Qubes automatically reload the driver for you. If not, try also reloading some dependent modules, in our example we must also reload iwlwifi:
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~~~
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[user@sys-net ~]$ modinfo iwlwifi | grep -E '^(description|author|depends):'
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author: Copyright(c) 2003- 2015 Intel Corporation <ilw@linux.intel.com>
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description: Intel(R) Wireless WiFi driver for Linux
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depends: cfg80211
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~~~
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~~~
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[user@sys-net ~]$ sudo rmmod iwlmvm
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[user@sys-net ~]$ sudo rmmod iwlwifi
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[user@sys-net ~]$ sudo modprobe iwlwifi # note the reverse order of loading/unloading
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[user@sys-net ~]$ sudo modprobe iwlmvm
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~~~
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Automatically reloading drivers on suspend/resume
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-------------------------------------------------
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If reloading the driver (which resets the hardware into a known-state) resolves your issue when done manually, you can have Qubes automatically un/reload them on suspend & resume by listing the relevant modules in `/rw/config/suspend-module-blacklist`.
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In the above example, it would look like this:
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~~~
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[user@sys-net config]$ cat /rw/config/suspend-module-blacklist
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# You can list here modules you want to be unloaded before going to sleep. This
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# file is used only if the VM has any PCI device assigned. Modules will be
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# automatically loaded after resume.
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iwlmvm
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iwlwifi
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~~~
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