Michael Garofalo writes via Kernel.org Bugzilla: I can still confirm this issue of the device not being detected, on Linux 6.12.10-arch1-1 from Arch Linux, on my ThinkPad T14 Gen 1 AMD, with a similar model card reader that utilizes the same 'rtsx_pci_sdmmc' driver, the RTS522A. My card is not detected until I unload and reload the 'rtsx_pci_sdmmc' driver. After doing so, I get the same 'cannot verify voltage switch' message, though my card is then detected. It then remains detected as inserted forever, even if the card is removed, until the drivers are unloaded and reloaded once again. My logs, if useful (187 is when I reloaded the module): $ sudo dmesg -w | grep -iE 'mmc|rtsx' [ 1.144983] rtsx_pci 0000:04:00.0: enabling device (0000 -> 0002) [ 187.573380] mmc0: cannot verify signal voltage switch [ 187.690136] mmc0: new ultra high speed SDR50 SDHC card at address aaaa [ 187.720150] mmcblk0: mmc0:aaaa SU04G 3.69 GiB [ 187.735364] mmcblk0: p1 My PCI device id: 04:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader (rev 01) I'd be happy to provide more info on this if useful. Appologies if I've done something wrong here, this is my first attempt at trying to use this Bugzilla. View: https://bugzilla.kernel.org/show_bug.cgi?id=204003#c28 You can reply to this message to join the discussion. -- Deet-doot-dot, I am a bot. Kernel.org Bugzilla (bugspray 0.1-dev)