Comment 9 for bug 44959

One simple solution to fix the problem with the long timeout after resume would be to prevent the mentioned modules from getting loaded by the kernel. I added the following two lines to my /etc/modprobe.d/blacklist:

blacklist sdhci
blacklist mmc_core

The downside is that the SD card slot certainly wouldn't run anymore, but that's no problem for me personally because I don't use it.