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Date:   Sun, 13 Mar 2022 15:24:51 +1000
From:   Stuart Longland <stuartl@longlandclan.id.au>
To:     Pkshih <pkshih@realtek.com>
Cc:     Bogdan Nicolae <bogdan.nicolae@acm.org>,
        "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
Subject: Re: No support for Realtek 8821CE RFE Type 6
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On Sun, 13 Mar 2022 14:01:41 +1000
Stuart Longland <stuartl@longlandclan.id.au> wrote:

> On Mon, 8 Nov 2021 03:28:07 +0000
> Pkshih <pkshih@realtek.com> wrote:
>=20
> > > > 2. If you boot this system into Windows 10, does the 8821CE work pr=
operly?
> > > >    If so, please give me its VID/PID of PCI.

> =E2=80=A6 now to try that patch.

The patch as given does not apply, but I managed to hand-fiddle it:

--- rtw8821c.c.orig     2022-03-13 15:13:34.406747572 +1000
+++ rtw8821c.c  2022-03-13 15:14:20.292573052 +1000
@@ -1498,6 +1498,7 @@
 static const struct rtw_rfe_def rtw8821c_rfe_defs[] =3D {
        [0] =3D RTW_DEF_RFE(8821c, 0, 0),
        [2] =3D RTW_DEF_RFE_EXT(8821c, 0, 0, 2),
+       [6] =3D RTW_DEF_RFE(8821c, 0, 0),
 };
=20
 static struct rtw_hw_reg rtw8821c_dig[] =3D {

This indeed fixes the problem:
http://static.vk4msl.id.au/2022/03/13-rtl8821ce/patched-dmesg.txt

[    4.166495] rtw_8821ce 0000:03:00.0: enabling device (0000 -> 0003)
[    4.173911] Loading firmware: rtw88/rtw8821c_fw.bin
[    4.185625] rtw_8821ce 0000:03:00.0: Firmware version 24.8.0, H2C versio=
n 12
[    4.273629] rtw_8821ce 0000:03:00.0 wlp3s0: renamed from wlan0
[    7.186954] rtw_8821ce 0000:03:00.0: start vif 0c:cf:89:ac:ac:be on port=
 0
[   16.074249] wlp3s0: authenticate with 7a:45:58:c8:b4:33
[   16.692213] wlp3s0: send auth to 7a:45:58:c8:b4:33 (try 1/3)
[   16.693038] wlp3s0: authenticated
[   16.711971] wlp3s0: associate with 7a:45:58:c8:b4:33 (try 1/3)
[   16.713480] wlp3s0: RX AssocResp from 7a:45:58:c8:b4:33 (capab=3D0x1111 =
status=3D0 aid=3D15)
[   16.713526] rtw_8821ce 0000:03:00.0: sta 7a:45:58:c8:b4:33 joined with m=
acid 0
[   16.713795] wlp3s0: associated
[   16.832337] IPv6: ADDRCONF(NETDEV_CHANGE): wlp3s0: link becomes ready
[   17.241966] rtw_8821ce 0000:03:00.0: failed to get tx report from firmwa=
re
--=20
Stuart Longland (aka Redhatter, VK4MSL)

I haven't lost my mind...
  ...it's backed up on a tape somewhere.