On 12/19/22 07:30, Ingo Saitz wrote:
I saw the 8821cu chipset being merged for linus' next kernel release and decided to give it a try. I have been running 8821cu from https://github.com/morrownr/8821cu-20210118 succeffully, so I know my hardware works. The driver as merged in commit 07cef03b8d44dee7488de3d1585387e603c78676 to git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git can't find any firmware for the driver, and the card does not work. At boot it repeatedly logged failures to my kernel.log: 2022-12-16T19:20:21.563669+01:00 pinguin kernel: [ 7.823614] rtw_8821cu 2-11:1.0: Firmware version 24.11.0, H2C version 12 2022-12-16T19:20:21.563670+01:00 pinguin kernel: [ 7.906497] usbcore: registered new interface driver rtw_8821cu 2022-12-16T19:20:21.563670+01:00 pinguin kernel: [ 7.930657] rtw_8821cu 2-11:1.0 wlx1cbfcefeb2a3: renamed from wlan0 2022-12-16T19:20:59.576907+01:00 pinguin kernel: [ 631.847796] rtw_8821cu 2-11:1.0: failed to download firmware 2022-12-16T19:20:59.576910+01:00 pinguin kernel: [ 631.849195] rtw_8821cu 2-11:1.0: leave idle state failed 2022-12-16T19:20:59.580239+01:00 pinguin kernel: [ 631.851635] rtw_8821cu 2-11:1.0: failed to leave ips state 2022-12-16T19:20:59.580241+01:00 pinguin kernel: [ 631.851636] rtw_8821cu 2-11:1.0: failed to leave idle state 2022-12-16T19:21:08.563579+01:00 pinguin kernel: [ 640.833372] rtw_8821cu 2-11:1.0: error beacon valid 2022-12-16T19:21:08.563590+01:00 pinguin kernel: [ 640.833480] rtw_8821cu 2-11:1.0: failed to download rsvd page 2022-12-16T19:21:08.563591+01:00 pinguin kernel: [ 640.833640] rtw_8821cu 2-11:1.0: failed to download firmware 2022-12-16T19:21:08.563591+01:00 pinguin kernel: [ 640.835040] rtw_8821cu 2-11:1.0: leave idle state failed 2022-12-16T19:21:08.566911+01:00 pinguin kernel: [ 640.837510] rtw_8821cu 2-11:1.0: failed to leave ips state 2022-12-16T19:21:08.566915+01:00 pinguin kernel: [ 640.837513] rtw_8821cu 2-11:1.0: failed to leave idle state 2022-12-16T19:21:17.550263+01:00 pinguin kernel: [ 649.820641] rtw_8821cu 2-11:1.0: error beacon valid 2022-12-16T19:21:17.550288+01:00 pinguin kernel: [ 649.820759] rtw_8821cu 2-11:1.0: failed to download rsvd page There is no mention of what firmware would be needed in the source code itself, yet the repositoryhttps://github.com/ulli-kroll/rtl8821cu includes a file firmware/rtl8821cufw.bin.
The firmware that is needed is the same as for the PCIe nersion, namely /lib/firmware/rtw88/rtw8821c_fw.bin. Your distro should have that firmware in package firmware-realtek, or in linux-firmware-realtek. If they do not, you can get it by 'git clone git://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git. The firware will be in directory rtw88.
Larry
