# /etc/modprobe.d/8821cu.conf
#
# Purpose: Allow easy access to specific driver options.
#
# Note:	pull-request: wireless-next-2022-12-12
# 		wireless-next patches for v6.2
#		wifi: rtw88: Add rtw8821cu chipset support
# The following line blacklists the above in-kernel driver.
blacklist rtw88_8821cu
#
# Edit the following line to change, add or delete options:
options 8821cu rtw_drv_log_level=0 rtw_led_ctrl=1 rtw_vht_enable=1 rtw_power_mgnt=1
#
# After editing is complete, save this file (if using nano: Ctrl + x, y, Enter)
# and reboot to activate the changes.
#
# Warning: Some adapters based on the rtl8821cu chipset may require the
# `rtw_RFE_type` option to be set. If wifi or bluetooth does not work
# after driver installation, see the appropriate section in the below
# documentation. This issue has not been seen on wifi only adapters.
#
# Documentation:
#
# -----
#
# Log options ( rtw_drv_log_level )
#
# 0 = NONE (default)
# 1 = ALWAYS
# 2 = ERROR
# 3 = WARNING
# 4 = INFO
# 5 = DEBUG
# 6 = MAX
#
# Note: You can save a log file that only includes RTW log entries by running
# the following in a terminal:
#
# sudo ./save-log.sh
#
# Note: The name of the log file will be ```rtw.log```.
#
# -----
#
# LED options ( rtw_led_ctrl )
#
# 0 = Always off
# 1 = Normal blink (default)
# 2 = Always on
#
# -----
#
# VHT options ( rtw_vht_enable )
#
#  0 = Disable
#  1 = Enable (default)
#  2 = Force auto enable (use only for 5 GHz AP mode)
#
# Notes:
# - A non-default setting can degrade performance greatly in managed mode.
# - Option 2 allows 80 MHz channel width for 5GHz AP mode, such as when
#   you are using hostapd.
#
# -----
#
# Power options ( rtw_power_mgnt )
#
# 0 = Disable power saving
# 1 = Power saving on, minPS (default)
# 2 = Power saving on, maxPS (not recommended for AP mode)
#
# -----
#
# Beamforming options ( rtw_beamform_cap )
#
# 1 = SU Beamformer (recommended for AP mode)
# 2 = SU Beamformee
# 3 = SU Beamformer and SU Beamformee
# 10= SU Beamformee and MU Beamformee (default)
# 11= SU Beamformer and SU Beamformee and MU Beamformee
#
# Note: MU Beamformer is not supported.
#
# From the source code:
#
# /* /os_dep/linux/os_intfs.c
#  * BIT0: Enable VHT SU Beamformer
#  * BIT1: Enable VHT SU Beamformee
#  * BIT2: Enable VHT MU Beamformer, depend on VHT SU Beamformer
#  * BIT3: Enable VHT MU Beamformee, depend on VHT SU Beamformee
#  * BIT4: Enable HT Beamformer
#  * BIT5: Enable HT Beamformee
#  */
#
# -----
#
# DFS Options ( rtw_dfs_region_domain )
#
# 0 = NONE (default)
# 1 = FCC
# 2 = MKK
# 3 = ETSI
#
# Notes:
# - Activates DFS channels in AP mode.
# - DFS FCC 80 MHz channels for hostapd: 52(58), 100(106), 116(122) and 132(138)
# - For more information: https://en.wikipedia.org/wiki/List_of_WLAN_channels
#
# Note: An AP needs to listen on a DFS channel for a period of 60 seconds
# before transmitting on the channel. If any radar pulses are detected,
# the AP cannot use that channel and will have to try a different channel.
#
# -----
#
# Select RFE type ( rtw_RFE_type )
#
# 0 = (2-Ant, DPDT), (2G_WLG, iPA, iLNA, iSW), (5G, iPA, iLNA, iSW)
# 1 = (1-Ant, SPDT@Ant1), (2G_WLG, iPA, iLNA, iSW), (5G, iPA, iLNA, iSW)
# 2 = (1-Ant, SPDT@Ant1) , (2G_BTG, iPA, iLNA, iSW), (5G, iPA, iLNA, iSW)
# 3 = (1-Ant, DPDT@Ant2), (2G_WLG, iPA, iLNA, iSW), (5G, iPA, iLNA, iSW)
# 4 = (1-Ant, DPDT@Ant2), (2G_BTG, iPA, iLNA, iSW), (5G, iPA, iLNA, iSW)
# 5 = (2-Ant), (2G_WLG, iPA, iLNA, iSW), (5G, iPA, iLNA, iSW)
# 6 = (2-Ant), (2G_WLG, iPA, iLNA, iSW), (5G, iPA, iLNA, iSW)
# 7 = (1-Ant), (2G_BTG, iPA, iLNA, iSW), (5G, iPA, iLNA, iSW) (try this setting first)
# 64 = this appears to be the default on adapters that do not support bluetooth
#
# Note: RFE Type is used to set antenna isolation and the BT coexistence
# mechanism. Some adapters require this setting and some do not. It may be
# necessary to try different settings to determine which setting is optimal
# for your adapter.
#
# -----
#
# To see all options that are available:
#
# $ ls /sys/module/8821cu/parameters/
#
# -----
#
# To see the values that are in use:
#
# $ grep [[:alnum:]] /sys/module/8821cu/parameters/*
#
# -----
#
# hostapd setup information for rtl8821cu
# Note: The best settings can vary but the following may be a good place to start.
#
# /etc/modprobe.d/8821cu.conf
# options 8821cu rtw_drv_log_level=0 rtw_led_ctrl=0 rtw_vht_enable=2 rtw_power_mgnt=1 rtw_dfs_region_domain=1
#
# Note: The best setting for `rtw_dfs_region_domain=` will depend on your location.
#
# /etc/hostapd/hostapd.conf
#
# hw ht capab: 0x862
# ht_capab=[HT40+][HT40-][SHORT-GI-20][SHORT-GI-40][MAX-AMSDU-7935]
#
# hw vht capab: 0x03c00022
# vht_capab=[MAX-MPDU-11454][SHORT-GI-80][HTC-VHT][MAX-A-MPDU-LEN-EXP7]
#
# -----