Comment 10 for bug 1810416

For anyone experiencing this issue with a Realtek RTL8411 card reader:

04:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTL8411B PCI Express Card Reader (rev 01)
 Subsystem: CLEVO/KAPOK Computer RTL8411B PCI Express Card Reader
 Flags: bus master, fast devsel, latency 0, IRQ 19
 Memory at a4215000 (32-bit, non-prefetchable) [size=4K]
 Expansion ROM at a4200000 [disabled] [size=64K]
 Capabilities: <access denied>
 Kernel driver in use: rtsx_pci
 Kernel modules: rtsx_pci

the out-of-tree rts_bpp module appears to work fine with kernel version 4.15.0-47: https://github.com/Ri0n/rts_bpp