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SD card reader not showing up on MacBook running Kubuntu, how to fix?

I'm using Kubuntu 21.10 on a 2012 MacBook Pro and super happy with it. However, I just noticed that the SD card reader doesn't register anywhere. I'm a photographer and use it quite often. I can still connect my cameras via USB, so it's not the end of the world, but I'd love to be able to just pop the SD card in. I have no idea where to start with this. I'm gathering that it's a Broadcom card reader, so it may need proprietary drivers (not an issue for me) but I don't know how to add it to my hardware list to even get it visible in Linux. Any suggestions?

Best Answered by

iBoysoft author Ciki Liu

Ciki Liu

Answered on Wednesday, August 30, 2023

 The most effective way yet to fix the Broadcom card reader not showing up on MacBook running Kubuntu is using command lines. Follow the detailed prompts below.

Step 1. On your MacBook running Linux, open the terminal by clicking on the Activities from the top-left corner and type in terminal/shell/prompt. Click on the terminal icon and open it for writing command lines.

Step 2. Type in the following prompts:

$ sudo touch /etc/rc.local  
$ sudo chmod +x /etc/rc.local  
$ sudo nano /etc/rc.local  
### add this line:  
setpci -s 00:1c.2 0x50.B=0x41  
[ctrl-o to write out, enter to save, ctrl-x to exit]

$ sudo nano /etc/apm/resume.d/21aspm  
### add the same line  
setpci -s 00:1c.2 0x50.B=0x41  
[ctrl-o, enter, ctrl-x]

$ sudo nano /etc/modprobe.d/sdhci.conf:  
### add the line:  
options sdhci debug_quirks2=4  
[ctrl-o, enter, ctrl-x]

### regenerate initrd  
$ sudo update-initramfs -u -k all

### reload shdhci module  
$ sudo rmmod sdhci-pci sdhci  
$ sudo modprobe sdhci  
$ sudo modprobe sdhci-pci

### reboot

Step 3. Your Mac restarts now. If unfortunately, your SD card reader is not working still, you can try the following command lines.

$ sudo setpci -s 00:1c.2 0x50.B=0x41

Other methods such as hardware check may work, but running prompts is considered the most working way to fix this issue.

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