Realtek RTS5249 PCIe card reader only works during live cd

[Klaas DC]

My laptop is a Dell XPS 9530 and comes with a Realtek PCI Express SD card reader.
I'm using a dualboot Win10/Xubuntu setup, but the card reader has been problematic in Linux ever since a kernel upgrade years ago. To start from a clean slate, I reinstalled XUbuntu 21.10 from scratch from the live CD.
First I checked within the live environment if the card reader worked and it did. Only "Eject" gives an error but otherwise everything worked multiple times.

After installing to HD however, nothing happens when inserting a card. Not even a dmesg entry.

When I run lspci, with the card still inserted, it is suddenly detected and automounted in Thunar.
In dmesg appears:

[ 268.053725] mmc0: cannot verify signal voltage switch
[ 268.181990] mmc0: new ultra high speed SDR104 SDHC card at address e624
[ 268.244413] mmcblk0: mmc0:e624 SL16G 14.8 GiB
[ 268.262138] mmcblk0:
[ 283.766834] mmcblk0:

lspci gave:
07:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5249 PCI Express Card Reader (rev 01)

I cannot unmount the card however, and any new attempts to get it detected by removing and inserting the card, running lspci again, fail. The disk entry in Thunar is basically stuck until reboot.

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: linux-image-5.13.0-21-generic 5.13.0-21.21
ProcVersionSignature: Ubuntu 5.13.0-21.21-generic 5.13.18
Uname: Linux 5.13.0-21-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu70
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: klaasdc 1376 F.... pulseaudio
 /dev/snd/controlC1: klaasdc 1376 F.... pulseaudio
CasperMD5CheckResult: pass
Date: Sun Nov 14 13:30:54 2021
InstallationDate: Installed on 2021-11-14 (0 days ago)
InstallationMedia: Xubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
MachineType: Dell Inc. XPS 15 9530
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.13.0-21-generic root=UUID=c95d44b5-73e5-445b-b851-fd86f6f9c875 ro quiet splash vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-5.13.0-21-generic N/A
 linux-backports-modules-5.13.0-21-generic N/A
 linux-firmware 1.201
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/30/2015
dmi.bios.release: 65.9
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A09
dmi.board.name: XPS 15 9530
dmi.board.vendor: Dell Inc.
dmi.board.version: A09
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias: dmi:bvnDellInc.:bvrA09:bd07/30/2015:br65.9:svnDellInc.:pnXPS159530:pvrA09:rvnDellInc.:rnXPS159530:rvrA09:cvnDellInc.:ct8:cvrNotSpecified:skuXPS159530:
dmi.product.name: XPS 15 9530
dmi.product.sku: XPS 15 9530
dmi.product.version: A09
dmi.sys.vendor: Dell Inc.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

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