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Bug#920945: sdhci Card Reader in Laptop not working in Debian but works in other distros.

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  Bug#920945: sdhci Card Reader in Laptop not working in Debian but works in other distros. thomasw@fastmail.cn - 2019-01-30 19:50 +0100
    Bug#920945:  thomasw@fastmail.cn - 2019-02-09 12:20 +0100

#63198 — Bug#920945: sdhci Card Reader in Laptop not working in Debian but works in other distros.

package: linux-image-amd64
The card reader is device 8086:9df5 and seems to use the sdhci_pci module. I tested with Buster which is kernel 4.19 at the time of testing. The following message is printed multiple times in dmesg but the card reader does not start.

[ 194.701899] sdhci-pci 0000:00:14.5: SDHCI controller found [8086:9df5] (rev 11)

In other distros (Arch and Ubuntu with a combination of kernels 4.18, 4.19, and 4.20) where the card reader works, the above message is printed once in addition to a few more messages which are.

[ 9.461848] sdhci-pci 0000:00:14.5: enabling device (0000 -> 0002)
[ 9.465085] mmc0: SDHCI controller on PCI [0000:00:14.5] using ADMA

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#63292 — Bug#920945:

I have some info that I think could help narrow this down and feel like I now at least have a trail to pursue. The SD card reader works in Fedora 30 Rawhide but not in the 29 iso. This means that between kernel 4.18 and 5.0 the maintainers in Fedora made a change to their config that made this start working. I could probably narrow this down even further by installing Fedora release 29 and testing each of the kernels that hit the repos to see if it was fixed before 5.0rc4. I am going to take a diff of the Fedora config files for those kernels to see if anyhing sticks out. Since it is from the same distro, I figure it should be pretty digestible.  I am going to try the experimental kernel in Debian and see if that fixes the issue as well.
Summary of what we know so far:
Kernel 4.19 in Debian Sid not working with reader.
Kernel 4.18 in Ubuntu 18.10 iso works with reader.
Kernels 4.19 and 4.20 work with reader in arch
Kernel 4.18 on Fedora 29 iso not working 
but 5.0 rc4 in rawhide is.

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