Package: linux-image-5.9.0-0.bpo.2-amd64 Version: 5.9.6-1~bpo10+1 Wireless card was not behaving normally after upgrading to kernel 5.9 from the backports (slow speeds, possibly repeatitive scannings).
I had to blacklist the two following modules (second module possibly optional). dpkg -S /lib/modules/5.9.0-0.bpo.2-amd64/kernel/drivers/net/wireless/realtek/rtw88/rtw88_8821ce.ko linux-image-5.9.0-0.bpo.2-amd64: /lib/modules/5.9.0-0.bpo.2-amd64/kernel/drivers/net/wireless/realtek/rtw88/rtw88_8821ce.ko dpkg -S /lib/modules/5.9.0-0.bpo.2-amd64/kernel/drivers/platform/x86/ideapad-laptop.ko linux-image-5.9.0-0.bpo.2-amd64: /lib/modules/5.9.0-0.bpo.2-amd64/kernel/drivers/platform/x86/ideapad-laptop.ko Then I installed this driver: https://github.com/tomaspinho/rtl8821ce After installing the above driver manually, the wireless card behaves normally. More info: dpkg -S linux-image-5.9.0-0.bpo.2-amd64 linux-image-5.9.0-0.bpo.2-amd64: /usr/share/bug/linux-image-5.9.0-0.bpo.2-amd64/include-1tainted linux-image-5.9.0-0.bpo.2-amd64: /usr/share/bug/linux-image-5.9.0-0.bpo.2-amd64/include-model linux-image-5.9.0-0.bpo.2-amd64: /usr/share/bug/linux-image-5.9.0-0.bpo.2-amd64/control linux-image-5.9.0-0.bpo.2-amd64: /usr/share/bug/linux-image-5.9.0-0.bpo.2-amd64 linux-image-5.9.0-0.bpo.2-amd64: /usr/share/doc/linux-image-5.9.0-0.bpo.2-amd64 linux-image-5.9.0-0.bpo.2-amd64: /usr/share/bug/linux-image-5.9.0-0.bpo.2-amd64/info linux-image-5.9.0-0.bpo.2-amd64: /usr/share/doc/linux-image-5.9.0-0.bpo.2-amd64/changelog.gz linux-image-5.9.0-0.bpo.2-amd64: /usr/share/bug/linux-image-5.9.0-0.bpo.2-amd64/include-usb linux-image-5.9.0-0.bpo.2-amd64: /usr/share/bug/linux-image-5.9.0-0.bpo.2-amd64/presubj linux-image-5.9.0-0.bpo.2-amd64: /usr/share/bug/linux-image-5.9.0-0.bpo.2-amd64/include-modules linux-image-5.9.0-0.bpo.2-amd64: /usr/share/bug/linux-image-5.9.0-0.bpo.2-amd64/include-network linux-image-5.9.0-0.bpo.2-amd64: /usr/share/bug/linux-image-5.9.0-0.bpo.2-amd64/include-1cmdline linux-image-5.9.0-0.bpo.2-amd64: /usr/share/bug/linux-image-5.9.0-0.bpo.2-amd64/include-pci linux-image-5.9.0-0.bpo.2-amd64: /usr/share/bug/linux-image-5.9.0-0.bpo.2-amd64/include-0version linux-image-5.9.0-0.bpo.2-amd64: /usr/share/bug/linux-image-5.9.0-0.bpo.2-amd64/include-dmesg linux-image-5.9.0-0.bpo.2-amd64: /usr/share/bug/linux-image-5.9.0-0.bpo.2-amd64/include-pstore linux-image-5.9.0-0.bpo.2-amd64: /usr/share/bug/linux-image-5.9.0-0.bpo.2-amd64/script linux-image-5.9.0-0.bpo.2-amd64: /usr/share/doc/linux-image-5.9.0-0.bpo.2-amd64/copyright Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-===============================-===============-============-================================= ii linux-image-5.9.0-0.bpo.2-amd64 5.9.6-1~bpo10+1 amd64 Linux 5.9 for 64-bit PCs (signed) dpkg --status linux-image-5.9.0-0.bpo.2-amd64 Package: linux-image-5.9.0-0.bpo.2-amd64 Status: install ok installed Priority: optional Section: kernel Installed-Size: 277139 Maintainer: Debian Kernel Team <debian-ker...@lists.debian.org> Architecture: amd64 Source: linux-signed-amd64 (5.9.6+1~bpo10+1) Version: 5.9.6-1~bpo10+1 Replaces: linux-image-5.9.0-0.bpo.2-amd64-unsigned Depends: kmod, linux-base (>= 4.3~), initramfs-tools (>= 0.120+deb8u2) | linux-initramfs-tool Recommends: firmware-linux-free, apparmor Suggests: linux-doc-5.9, debian-kernel-handbook, grub-pc | grub-efi-amd64 | extlinux Breaks: initramfs-tools (<< 0.120+deb8u2), wireless-regdb (<< 2019.06.03-1~), xserver-xorg-input-vmmouse (<< 1:13.0.99) Conflicts: linux-image-5.9.0-0.bpo.2-amd64-unsigned Description: Linux 5.9 for 64-bit PCs (signed) The Linux kernel 5.9 and modules for use on PCs with AMD64, Intel 64 or VIA Nano processors. . The kernel image and modules are signed for use with Secure Boot. Built-Using: linux (= 5.9.6-1~bpo10+1) Homepage: https://www.kernel.org/