mirror of
https://github.com/morrownr/8821cu-20210916.git
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184 lines
6.3 KiB
Markdown
184 lines
6.3 KiB
Markdown
### FAQ
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Secure Boot Information
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Question: The driver installation script completed successfully and the
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driver is installed but does not seem to be working. What is wrong?
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Answer: This question often comes up after installing the driver to a
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system that has Secure Boot on. To test if there is a Secure Boot related
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problem, turn secure boot off in the system BIOS and reboot. If the driver
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works as expected after reboot, them the problem is likely related to
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Secure Boot.
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What will increase my chances of having a sucessessful installation on a
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system that has Secure Boot on?
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First and foremost, make sure Secure Boot is on when you initially install
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your Linux distro. If your Linux distro was installed with Secure Boot off,
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the easiest solution is likely to do a clean reinstallation with Secure Boot
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on.
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Ubuntu is used as the example but other distros should be similar to one
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degree or another. During the installation there will be a box on one of
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installation pages that will appear if the installation program detects
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that Secure Boot is on. You will need to check the appropriate box and
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supply a password. You can use the same password that you use for the system
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if you wish. After the installation and reboot completes, the first screen
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you should see is the mokutil screen. Mokutil will guide you through the
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process of setting up your system to support Secure Boot. If you are unsure
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what to do, I recommend you seek guidance from your distro documentation or
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user forums. Having Secure Boot properly set up in your installation is very
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important.
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The `install-driver.sh` script currently supports Secure Boot if `dkms`
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is installed. Here is a link to the `dkms` website. There is information
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regarding Secure Boot in two sections in the `README`.
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https://github.com/dell/dkms
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Here is a link regarding Debian and Secure Boot:
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https://wiki.debian.org/SecureBoot
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There is work underway to add Secure Boot suport for systems that do not
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have `dkms` available or if a manual installation is desired.
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-----
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Question: Is WPA3 supported?
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Answer: WPA3-SAE is supported. It works well on most modern Linux distros
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but not all. Generally the reason for WPA3 not working on Linux distros is
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that the distro has an old version of wpa_supplicant or Network Manager.
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Your options are to upgrade to a more modern distro such as those released
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after mid-2022 or compile and install new versions of wpa_supplicant and/or
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Network Manager.
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-----
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Question: I bought two usb wifi adapters based on this chipset and am
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planning to use both in the same computer. How do I set that up?
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Answer: Realtek drivers do not support more than one adapter with the
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same chipset in the same computer. You can have multiple Realtek based
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adapters in the same computer as long as the adapters are based on
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different chipsets.
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Recommendation: If this is an important capability for you, I have tested
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Mediatek adapters for this capability and it does work with adapters that
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use the following chipsets: mt7921au, mt7612u and mt7610u.
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-----
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Question: Why do you recommend Mediatek based adapters when you maintain
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this repo for a Realtek driver?
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Answer: Many new and existing Linux users already have adapters based on
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Realtek chipsets. This repo is for Linux users to support their existing
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adapters but my STRONG recommendation is for Linux users to seek out USB
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WiFi solutions based on Mediatek chipsets. Mediatek is making and
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supporting their drivers per Linux Wireless Standards guidance per the
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Linux Foundation. This results in far fewer compatibility and support
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problems. More information and recommended adapters shown at the
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following site:
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https://github.com/morrownr/USB-WiFi
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-----
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Question: Will you put volunteers to work?
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Answer: Yes. Post a message in `Issues` or `Discussions` if interested.
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-----
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Question: I am having problems with my adapter and I use Virtualbox?
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Answer: This [article](https://null-byte.wonderhowto.com/forum/wifi-hacking-attach-usb-wireless-adapter-with-virtual-box-0324433/) may help.
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-----
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Question: Can you provide additional information about monitor mode?
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Answer: I have a repo that is setup to help with monitor mode:
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https://github.com/morrownr/Monitor_Mode
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Work to improve monitor mode is ongoing with this driver. Your reports of
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success or failure are needed. If you have yet to buy an adapter to use with
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monitor mode, there are adapters available that are known to work very well
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with monitor mode. My recommendation for those looking to buy an adapter for
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monitor mode is to buy adapters based on the following chipsets: mt7921au,
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mt7612u, mt7610u, rtl8821cu, and rtl8812bu. My specific recommendations for
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adapters in order of preference currently are:
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ALFA AWUS036ACHM - long range - in-kernel driver
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ALFA AWUS036ACM - in-kernel driver
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ALFA AWUS036ACU - in-kernel driver (as of kernel 6.2) and [out-of-kernel driver](https://github.com/morrownr/8821cu)
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To ask questions, go to [USB-WiFi](https://github.com/morrownr/USB-WiFi)
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and post in `Discussions` or `Issues`.
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-----
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Question: How do I forget a saved WiFi network on a Raspberry Pi?
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Note: This answer is for the Raspberry Pi OS without Network Manager active.
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Step 1: Edit `wpa_supplicant.conf`
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```
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sudo ${EDITOR} /etc/wpa_supplicant/wpa_supplicant.conf
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```
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Note: Replace ${EDITOR} with the name of the text editor you wish to use.
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#### Step 2: Delete the relevant WiFi network block (including the '`network=`' and opening/closing braces).
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#### Step 3: Save the file.
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#### Step 4: Reboot
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-----
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Question: How do I disable the onboard WiFi in a Raspberry Pi?
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Note: This answer is for the Raspberry Pi OS.
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Answer:
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Add the following line to `/boot/config.txt`
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```
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dtoverlay=disable-wifi
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```
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-----
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Question: I have an adapter with the 8821cu chipset and it supports
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bluetooth. The bluetooth works but the wifi does not. What is wrong?
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Answer: There appears to be an issue that is caused by makers setting up
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adapters differently. The fix is to set the driver option ( `rtw_RFE_type` )
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in 8821cu.conf. The easiest way to edit 8821cu.conf is to run the following
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from the driver directory:
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```
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sudo ./edit-options.sh
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```
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Once in the document, you can scroll down to the documentation about
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`rtw_RFE_type`. You will likely have to experiment to find out what setting
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works best for your adapter but a good place to start is probably...
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```
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rtw_RFE_type=7
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```
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Simply add that option to the end of the `options` line, save and reboot.
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-----
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