Further info
I've just rebooted the laptop using the kernel that was left over from the upgrade from groovy. The mmc card reader works OK there.
A reboot back to the latest hirsute kernel has it failing again.
So: 5.8.0-53-generic - mmc reader works 5.11.0-17-generic - mmc reader fails
Further info
I've just rebooted the laptop using the kernel that was left over from the upgrade from groovy.
The mmc card reader works OK there.
A reboot back to the latest hirsute kernel has it failing again.
So: 0-17-generic - mmc reader fails
5.8.0-53-generic - mmc reader works
5.11.