求助：Ubuntu无法读取内置读卡器中的SD卡（Windows下可正常使用）

Hey there, let's work through this SD card issue together—since it works perfectly on Windows, we know the card itself is functional, so we can narrow our focus to Ubuntu-specific settings or hardware recognition. Here's a step-by-step breakdown to get it working:

1. First, check if Ubuntu recognizes the SD card #

Let's verify the system detects the card at the hardware level:

• Open a terminal and run lsblk — look for a device labeled something like mmcblk0 (this is typically the SD card, with mmcblk0p1 being its main partition). If you see it, skip to step 2; if not, move to the next checks.
• Run dmesg | tail -20 right after inserting the card. Look for lines mentioning "mmc" or "SD card" — if there are error messages about "failed to initialize" or "no driver found," we're dealing with a driver or hardware issue.
• Quick sanity check: Some laptops have a physical switch for the card reader, or the reader might be disabled in BIOS. Double-check those first!

2. Fix automatic mounting failures #

If Ubuntu sees the card but doesn't show it in the file manager, it might be a mounting problem:

• Create a temporary mount point: sudo mkdir /mnt/sdcard
• Mount the partition (replace /dev/mmcblk0p1 with your actual partition from lsblk): sudo mount /dev/mmcblk0p1 /mnt/sdcard
• If you get an error about "unknown filesystem type 'ntfs'", Ubuntu doesn't support NTFS out of the box. Install the required package with sudo apt install ntfs-3g, then try mounting again.
• Once mounted, you can access the card at /mnt/sdcard. If this works, the issue is with automatic mounting — you can set up a permanent mount entry in /etc/fstab if needed.

3. Troubleshoot card reader drivers #

Built-in readers sometimes need specific kernel drivers. Let's check:

• Run lspci | grep -i card to find your reader's make/model (e.g., Realtek RTS5129).
• Check if the required driver module is loaded: lsmod | grep mmc — look for modules like mmc_block or your reader-specific module.
• If the module is missing, try loading it manually: sudo modprobe mmc_block (replace with your reader's module if different).
• For newer or less common readers, you might need to install a third-party driver via apt, but start with the kernel modules first.

4. Fix file system inconsistencies #

Windows is more forgiving of minor file system errors, but Ubuntu might refuse to mount the card if it detects issues:

• Boot into Windows, right-click the SD card in File Explorer → Properties → Tools → Check. Let Windows scan and repair any errors, then eject the card properly.
• If you prefer to fix it in Ubuntu (only for non-NTFS filesystems like FAT32), first unmount the card: sudo umount /dev/mmcblk0p1, then run sudo fsck /dev/mmcblk0p1. Follow the prompts to fix any detected issues.

5. Isolate the problem #

To rule out hardware vs. system issues:

• Try the SD card in a USB card reader connected to Ubuntu. If it works, the problem is with your built-in reader (might need a driver replacement or hardware check).
• Try a different SD card in your built-in reader. If that works, your original card has a quirk that Ubuntu is sensitive to (the Windows repair step above should fix this).

内容的提问来源于stack exchange，提问作者 Rapidrob