RTL8821CE - 5GHZ networks not working

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1861278

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

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We'll update the DKMS soon.

Once Realtek provides 8821ce support in rtw88, we can get rid of the DKMS altogether.

PPA: https://launchpad.net/~vicamo/+archive/ubuntu/ppa-1861278

So I can confirm with patch from https://github.com/tomaspinho/rtl8821ce/pull/50 built into ppa-1861278, some previously disabled entries from `iw list` output now become enabled but with comments "(no IR, radar detection)". Don't quite know what does this mean and I'd need verification with realy hardware before proceeding to land this patch.

I installed the patched Version and could provide you with some tests if you could point me in the way of what you would need to know.

@justcomplaining, since this was reported by you stating some 5G network is not visible, does that kernel work for you now? If the result is positive, I'll continue to backport this patch.

Status changed to 'Confirmed' because the bug affects multiple users.

My desired network is sadly still not detected. Not sure why.

iwlist wlo1 freq
wlo1 32 channels in total; available frequencies :
          Channel 01 : 2.412 GHz
          Channel 02 : 2.417 GHz
          Channel 03 : 2.422 GHz
          Channel 04 : 2.427 GHz
          Channel 05 : 2.432 GHz
          Channel 06 : 2.437 GHz
          Channel 07 : 2.442 GHz
          Channel 08 : 2.447 GHz
          Channel 09 : 2.452 GHz
          Channel 10 : 2.457 GHz
          Channel 11 : 2.462 GHz
          Channel 12 : 2.467 GHz
          Channel 13 : 2.472 GHz
          Channel 36 : 5.18 GHz
          Channel 40 : 5.2 GHz
          Channel 44 : 5.22 GHz
          Channel 48 : 5.24 GHz
          Channel 52 : 5.26 GHz
          Channel 56 : 5.28 GHz
          Channel 60 : 5.3 GHz
          Channel 64 : 5.32 GHz
          Channel 100 : 5.5 GHz
          Channel 104 : 5.52 GHz
          Channel 108 : 5.54 GHz
          Channel 112 : 5.56 GHz
          Channel 116 : 5.58 GHz
          Channel 120 : 5.6 GHz
          Channel 124 : 5.62 GHz
          Channel 128 : 5.64 GHz
          Channel 132 : 5.66 GHz
          Channel 136 : 5.68 GHz
          Channel 140 : 5.7 GHz
          Current Frequency:2.437 GHz (Channel 6)

iw list
Wiphy phy0
 max # scan SSIDs: 9
 max scan IEs length: 2304 bytes
 max # sched scan SSIDs: 0
 max # match sets: 0
 max # scan plans: 1
 max scan plan interval: -1
 max scan plan iterations: 0
 Retry short limit: 7
 Retry long limit: 4
 Coverage class: 0 (up to 0m)
 Supported Ciphers:
  * WEP40 (00-0f-ac:1)
  * WEP104 (00-0f-ac:5)
  * TKIP (00-0f-ac:2)
  * CCMP-128 (00-0f-ac:4)
 Available Antennas: TX 0 RX 0
 Supported interface modes:
   * IBSS
   * managed
   * AP
 Band 1:
  Capabilities: 0x1962
   HT20/HT40
   Static SM Power Save
   RX HT20 SGI
   RX HT40 SGI
   RX STBC 1-stream
   Max AMSDU length: 7935 bytes
   DSSS/CCK HT40
  Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
  Minimum RX AMPDU time spacing: 16 usec (0x07)
  HT Max RX data rate: 150 Mbps
  HT TX/RX MCS rate indexes supported: 0-7
  Bitrates (non-HT):
   * 1.0 Mbps
   * 2.0 Mbps
   * 5.5 Mbps
   * 11.0 Mbps
   * 6.0 Mbps
   * 9.0 Mbps
   * 12.0 Mbps
   * 18.0 Mbps
   * 24.0 Mbps
   * 36.0 Mbps
   * 48.0 Mbps
   * 54.0 Mbps
  Frequencies:
   * 2412 MHz [1] (20.0 dBm)
   * 2417 MHz [2] (20.0 dBm)
   * 2422 MHz [3] (20.0 dBm)
   * 2427 MHz [4] (20.0 dBm)
   * 2432 MHz [5] (20.0 dBm)
   * 2437 MHz [6] (20.0 dBm)
   * 2442 MHz [7] (20.0 dBm)
   * 2447 MHz [8] (20.0 dBm)
   * 2452 MHz [9] (20.0 dBm)
   * 2457 MHz [10] (20.0 dBm)
   * 2462 MHz [11] (20.0 dBm)
   * 2467 MHz [12] (20.0 dBm) (no IR)
   * 2472 MHz [13] (20.0 dBm) (no IR)
   * 2484 MHz [14] (disabled)
 Band 2:
  Capabilities: 0x1862
   HT20/HT40
   Static SM Power Save
   RX HT20 SGI
   RX HT40 SGI
   No RX STBC
   Max AMSDU length: 7935 bytes
   DSSS/CCK HT40
  Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
  Minimum RX AMPDU time spacing: 16 usec (0x07)
  HT Max RX data rate: 150 Mbps
  HT TX/RX MCS rate indexes supported: 0-7
  VHT Capabilities (0x03c00120):
   Max MPDU length: 3895
   Supported Channel Width: neither 160 nor 80+80
   short GI (80 MHz)
   +HTC-VHT
  VHT RX MCS set:
   ...

Hi, I've just uploaded another version to my ppa in https://launchpad.net/~vicamo/+archive/ubuntu/ppa-1861278 . This version integrates both bug 1865147 and bug 1884648 as well.

Thank you!

A few of the neighbour's 5GHz networks are shown, but my own is still missing. So it's probably not about 5 GHz networks in general anymore...

Any ideas on what could be the issue? The router broadcasts both a 2,4 Ghz as well as a 5 Ghz network and I can connect to the 2,4 but can not see the 5 Ghz. On the android phone it shows up and works fine.

I checked some WiFi info via the Android phone. Of the 5 5G networks shown there, only two show up on the laptop.

The ones that do show up are on channels 48-42 (5240 MHz) and 36-42 (5180 MHz).

The ones that do not show up are on channels 100-106 (5500 MHz), 140-138 (5700 MHz) and 140-138 (5700 MHz).

Three additional networks show up on the laptop, one at channel 44 (5220 MHz), one at Channel 48 (5240 MHz) and one unnamed network without channel information at 5785 MHz.

I tried changing the channel in the router configuration to 36, 44 and 48 but that did not help either.

I have now also detected networks on channel 140 (5.7 Ghz) and channel 64 (5.32 GHz) at a different location.

Probably you Android phone is equipped with some other WiFi chip. Currently this RTL8821CE driver supports only 5G networks listed in `iw list`.

Add linux package to affected for bug 1884513 is to backport 8821ce support in rtw88. Let's see if it will have better support for 5G networks.

Public bug 1885862 instead.

The Eoan Ermine has reached end of life, so this bug will not be fixed for that release

I have news: I can connect to my 5 GHZ network now. I am not sure why though.
(1) I changed the 5GHZ channel
(2) I changed the frequency band from 80mhz to 40mhz
(3) Maybe the last driver update from March did something?

Here are my current outputs (I don't think there's much change though):

dmesg | grep 8821
[ 2.503406] rtl8821ce: loading out-of-tree module taints kernel.
[ 2.506732] rtl8821ce: module verification failed: signature and/or required key missing - tainting kernel
[ 2.956481] rtl8821ce 0000:02:00.0 wlo1: renamed from wlan0

dmesg |grep -i firm
[ 0.131142] Spectre V2 : Enabling Restricted Speculation for firmware calls
[ 2.562917] [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4)

iw list
Wiphy phy0
 max # scan SSIDs: 9
 max scan IEs length: 2304 bytes
 max # sched scan SSIDs: 0
 max # match sets: 0
 max # scan plans: 1
 max scan plan interval: -1
 max scan plan iterations: 0
 Retry short limit: 7
 Retry long limit: 4
 Coverage class: 0 (up to 0m)
 Supported Ciphers:
  * WEP40 (00-0f-ac:1)
  * WEP104 (00-0f-ac:5)
  * TKIP (00-0f-ac:2)
  * CCMP-128 (00-0f-ac:4)
 Available Antennas: TX 0 RX 0
 Supported interface modes:
   * IBSS
   * managed
   * AP
 Band 1:
  Capabilities: 0x1962
   HT20/HT40
   Static SM Power Save
   RX HT20 SGI
   RX HT40 SGI
   RX STBC 1-stream
   Max AMSDU length: 7935 bytes
   DSSS/CCK HT40
  Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
  Minimum RX AMPDU time spacing: 16 usec (0x07)
  HT Max RX data rate: 150 Mbps
  HT TX/RX MCS rate indexes supported: 0-7
  Bitrates (non-HT):
   * 1.0 Mbps
   * 2.0 Mbps
   * 5.5 Mbps
   * 11.0 Mbps
   * 6.0 Mbps
   * 9.0 Mbps
   * 12.0 Mbps
   * 18.0 Mbps
   * 24.0 Mbps
   * 36.0 Mbps
   * 48.0 Mbps
   * 54.0 Mbps
  Frequencies:
   * 2412 MHz [1] (20.0 dBm)
   * 2417 MHz [2] (20.0 dBm)
   * 2422 MHz [3] (20.0 dBm)
   * 2427 MHz [4] (20.0 dBm)
   * 2432 MHz [5] (20.0 dBm)
   * 2437 MHz [6] (20.0 dBm)
   * 2442 MHz [7] (20.0 dBm)
   * 2447 MHz [8] (20.0 dBm)
   * 2452 MHz [9] (20.0 dBm)
   * 2457 MHz [10] (20.0 dBm)
   * 2462 MHz [11] (20.0 dBm)
   * 2467 MHz [12] (20.0 dBm) (no IR)
   * 2472 MHz [13] (20.0 dBm) (no IR)
   * 2484 MHz [14] (disabled)
 Band 2:
  Capabilities: 0x1862
   HT20/HT40
   Static SM Power Save
   RX HT20 SGI
   RX HT40 SGI
   No RX STBC
   Max AMSDU length: 7935 bytes
   DSSS/CCK HT40
  Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
  Minimum RX AMPDU time spacing: 16 usec (0x07)
  HT Max RX data rate: 150 Mbps
  HT TX/RX MCS rate indexes supported: 0-7
  VHT Capabilities (0x03c00120):
   Max MPDU length: 3895
   Supported Channel Width: neither 160 nor 80+80
   short GI (80 MHz)
   +HTC-VHT
  VHT RX MCS set:
   1 streams: MCS 0-9
   2 streams: not supported
   3 streams: not supported
   4 streams: not supported
   5 streams: not supported
   6 streams: not supported
   7 streams: not supported
   8 streams: not supported
  VHT RX highest supported: 434 Mbps
  VHT TX MCS set:
   1 streams: MCS 0-9
   2 streams: not supported
   3 streams: not supported
   4 streams: not supported
   5 streams: not supported
   6 streams: not supported
   7 streams: not supported
   8 streams: not supported
  VHT ...