Enable hotspot feature for Realtek 8821CE

I am using ubuntu 22.04. My laptop has Realtek 8821CE. Kernel version is 5.15.0-27-generic. Wifi hotspot turns on, but other devices are unable to connect. Is this problem related to this bug?

yes, the driver patch for jammy 5.15 kernel is still in progress. Therefore, the modules's hotspot mode is not supported yet.

This bug is awaiting verification that the linux-oem-5.14/5.14.0-1035.38 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

still unverified..

Can someone please verify the fix? I cannot verify the fix for Ubuntu 20.04, I am running Ubuntu 22.04 and I enabled proposed from software & updates, there were a few kernel updates, the latest one being 5.15.0-30-generic. I did all the available updates in proposed. But wifi hotspot still doesn't work on Ubuntu 22.04. My smartphone is able to detect the hotspot but is unable to connect to it.

Enable proposed on DUT which uses RTL8821CE [10ec:c828] and install 5.14.0-1035.38. Hotspot works fine. My smart phone can connect it and surf the internet.

Hello @soumadeepsarkar1,
Can you help to install oem kernel and re-test on your DUT?

$ sudo apt install linux-oem-20.04d

@andch, I am using Ubuntu 22.04 on my DUT. On running the following command:
$ sudo apt install linux-oem-20.04d

it cannot find the package
It returns:

E: Unable to locate package linux-oem-20.04d
E: Couldn't find any package by glob 'linux-oem-20.04d'

After searching the Internet, I found that I had to add the following line:
deb http://security.ubuntu.com/ubuntu focal-security main
to /etc/apt/sources.list
So I did that, ran sudo apt update and then installed the linux-oem-20.04d kernel, restarted my pc. From grub, I went into advanced options for ubuntu and selected the linux-oem-20.04d kernel. But still the hotspot problem persists.
I noticed that the kernel version that got installed is 5.14.0-1033-oem.
$ uname -r
5.14.0-1033-oem

oh! Sorry, I didn’t notice thar you’re using 22.04. For 5.15-genric kernel, you can monitor this bug with the Linux -> Jammy series.

@andch, after searching the internet some more, I figured out that I needed to add the proposed for focal in /etc/apt/sources.list in order to install the kernel 5.14.0-1035.38 (the same one that you installed). So I did all that, and THE FIX WORKS. My smartphone can connect to the hotspot and access the internet.

Hope to see this fix implemented on the default kernels of Ubuntu 22.04 as soon as possible.

This bug was fixed in the package linux-oem-5.14 - 5.14.0-1036.40

---------------
linux-oem-5.14 (5.14.0-1036.40) focal; urgency=medium

  * focal/linux-oem-5.14: 5.14.0-1036.40 -proposed tracker (LP: #1971982)

  * AMD APU s2idle is broken after the ASIC reset fix (LP: #1972134)
    - drm/amdgpu: unify BO evicting method in amdgpu_ttm
    - drm/amdgpu: explicitly check for s0ix when evicting resources

  * amd_gpio AMDI0030:00: Failed to translate GPIO pin 0x0000 to IRQ, err -517
    (LP: #1971597)
    - gpio: Request interrupts after IRQ is initialized

linux-oem-5.14 (5.14.0-1035.38) focal; urgency=medium

  * focal/linux-oem-5.14: 5.14.0-1035.38 -proposed tracker (LP: #1969056)

  * Packaging resync (LP: #1786013)
    - [Packaging] resync getabis

  * Mute/mic LEDs no function on EliteBook G9 platfroms (LP: #1970552)
    - ALSA: hda/realtek: Enable mute/micmute LEDs support for HP Laptops

  * Mute/mic LEDs no function on HP EliteBook 845/865 G9 (LP: #1970178)
    - ALSA: hda/realtek: Enable mute/micmute LEDs and limit mic boost on EliteBook
      845/865 G9

  * Focal update: upstream stable patchset 2022-04-22 (LP: #1969892)
    - Revert "swiotlb: rework "fix info leak with DMA_FROM_DEVICE""
    - USB: serial: pl2303: add IBM device IDs
    - dt-bindings: usb: hcd: correct usb-device path
    - USB: serial: pl2303: fix GS type detection
    - USB: serial: simple: add Nokia phone driver
    - mm: kfence: fix missing objcg housekeeping for SLAB
    - HID: logitech-dj: add new lightspeed receiver id
    - HID: Add support for open wheel and no attachment to T300
    - xfrm: fix tunnel model fragmentation behavior
    - ARM: mstar: Select HAVE_ARM_ARCH_TIMER
    - virtio_console: break out of buf poll on remove
    - vdpa/mlx5: should verify CTRL_VQ feature exists for MQ
    - tools/virtio: fix virtio_test execution
    - ethernet: sun: Free the coherent when failing in probing
    - gpio: Revert regression in sysfs-gpio (gpiolib.c)
    - spi: Fix invalid sgs value
    - net:mcf8390: Use platform_get_irq() to get the interrupt
    - Revert "gpio: Revert regression in sysfs-gpio (gpiolib.c)"
    - spi: Fix erroneous sgs value with min_t()
    - Input: zinitix - do not report shadow fingers
    - af_key: add __GFP_ZERO flag for compose_sadb_supported in function
      pfkey_register
    - net: dsa: microchip: add spi_device_id tables
    - selftests: vm: fix clang build error multiple output files
    - locking/lockdep: Avoid potential access of invalid memory in lock_class
    - drm/amdgpu: move PX checking into amdgpu_device_ip_early_init
    - drm/amdgpu: only check for _PR3 on dGPUs
    - iommu/iova: Improve 32-bit free space estimate
    - tpm: fix reference counting for struct tpm_chip
    - usb: typec: tipd: Forward plug orientation to typec subsystem
    - USB: usb-storage: Fix use of bitfields for hardware data in ene_ub6250.c
    - xhci: fix garbage USBSTS being logged in some cases
    - xhci: fix runtime PM imbalance in USB2 resume
    - xhci: make xhci_handshake timeout for xhci_reset() adjustable
    - xhci: fix uninitialized string returned by xhci_decode_ctrl_ctx()
    - mei: me: disable driver on the ign firmware
    - mei: ...

oem-5.17 verification missing

Installed 5.17.0-1009-oem unsigned kernel image on Ubuntu 22.04 and tested the fix. The fix works. My phone can connect to the wifi hotspot and browse the internet.

This bug was fixed in the package linux-oem-5.17 - 5.17.0-1011.12

---------------
linux-oem-5.17 (5.17.0-1011.12) jammy; urgency=medium

  * CVE-2022-1972
    - netfilter: nf_tables: sanitize nft_set_desc_concat_parse()

  * CVE-2022-1966
    - netfilter: nf_tables: disallow non-stateful expression in sets earlier

 -- Thadeu Lima de Souza Cascardo <email address hidden> Fri, 03 Jun 2022 14:17:23 -0300

This bug was fixed in the package linux - 5.15.0-40.43

---------------
linux (5.15.0-40.43) jammy; urgency=medium

  * jammy/linux: 5.15.0-40.43 -proposed tracker (LP: #1978610)

  * Packaging resync (LP: #1786013)
    - debian/dkms-versions -- update from kernel-versions (main/2022.05.30)

  * [SRU][OEM-5.14/OEM-5.17/J][PATCH 0/2] Fix system hangs after s2idle on AMD
    A+A GPU (LP: #1975804)
    - Revert "drm/amd/pm: keep the BACO feature enabled for suspend"
    - drm/amd: Don't reset dGPUs if the system is going to s2idle

  * [SRU][OEM-5.14/OEM-5.17/J][PATCH 0/1] Read the discovery registers for
    AMD_SFH (LP: #1975798)
    - HID: amd_sfh: Add support for sensor discovery

  * [UBUNTU 20.04] CPU-MF: add extended counter set definitions for new IBM z16
    (LP: #1974433)
    - s390/cpumf: add new extended counter set for IBM z16

  * [UBUNTU 20.04] KVM nesting support leaks too much memory, might result in
    stalls during cleanup (LP: #1974017)
    - KVM: s390: vsie/gmap: reduce gmap_rmap overhead

  * [UBUNTU 20.04] Null Pointer issue in nfs code running Ubuntu on IBM Z
    (LP: #1968096)
    - NFS: Fix up nfs_ctx_key_to_expire()

  * Fix REG_WAIT timeout for Yellow Carp (LP: #1971417)
    - drm/amd/display: Clear encoder assignments when state cleared.
    - drm/amd/display: fix stale info in link encoder assignment
    - drm/amd/display: Query all entries in assignment table during updates.
    - drm/amd/display: Initialise encoder assignment when initialising dc_state

  * Enable hotspot feature for Realtek 8821CE (LP: #1969326)
    - rtw88: Add update beacon flow for AP mode
    - rtw88: 8821c: Enable TX report for management frames
    - rtw88: do PHY calibration while starting AP
    - rtw88: 8821c: fix debugfs rssi value
    - rtw88: add ieee80211:sta_rc_update ops

  * prevent kernel panic with overlayfs + shiftfs (LP: #1973620)
    - SAUCE: overlayfs: prevent dereferencing struct file in ovl_vm_prfile_set()

  * disable Intel DMA remapping by default (LP: #1971699)
    - Revert "UBUNTU: [Config] enable Intel DMA remapping options by default"

  * Mute/mic LEDs no function on Elitebook 630 (LP: #1974111)
    - ALSA: hda/realtek: fix right sounds and mute/micmute LEDs for HP machine

  * [Regression] Real-time Kernel Build Failure (LP: #1972899)
    - x86/mm: Include spinlock_t definition in pgtable.

  * build backport-iwlwifi-dkms as linux-modules-iwlwifi-ABI (LP: #1969434)
    - [Packaging] support standalone dkms module builds
    - [Packaging] drop do_<mod> arch specific configs

  * IPU6 camera has no function on Andrews MLK (LP: #1964983)
    - SAUCE: IPU6: 2022-03-11 alpha release for Andrews MLK
    - [Config] IPU6: enable OV02C10 sensor
    - SAUCE: IPU6: 2022-04-01 Andrews MLK PV release
    - SAUCE: spi: ljca: return when a sub-transaction first failed
    - SACUE: ljca: disable parallelly stub write
    - SAUCE: ljca: fix race condition issue in runtime PM
    - SAUCE: i2c-ljca: fix a null pointer access issue on tgl
    - SAUCE: ljca: fix a typo issue
    - SAUCE: ljca: assume stub enum failed as a warning
    - SAUCE: mei: cleanup header file including
    - SAUCE: intel_ulpss: Replaced by LJCA and remove
    ...