http://bugzilla.opensuse.org/show_bug.cgi?id=1187439 Bug ID: 1187439 Summary: unstable mmcblk SD card support Classification: openSUSE Product: openSUSE Distribution Version: Leap 15.3 Hardware: Other OS: Other Status: NEW Severity: Normal Priority: P5 - None Component: Kernel Assignee: kernel-bugs@opensuse.org Reporter: sbrabec@suse.com QA Contact: qa-bugs@suse.de Found By: --- Blocker: --- Created attachment 850335 --> http://bugzilla.opensuse.org/attachment.cgi?id=850335&action=edit hwinfo After upgrade to openSUSE Leap 15.3, the MMC microSD slot of my ThinkPad Carbon X1 sometimes does not work and it fails to recognize the card. My kernel is 5.3.18-57-default. Failed state: [ 5.169110] mmc0: cannot verify signal voltage switch [ 5.480601] mmc0: error -110 whilst initialising SD card [ 6.334734] mmc0: cannot verify signal voltage switch [ 6.649050] mmc0: error -110 whilst initialising SD card [ 7.493641] mmc0: cannot verify signal voltage switch [ 7.800653] mmc0: error -110 whilst initialising SD card Sometimes the error appears, but later it succeeds: [ 4.364166] mmc0: cannot verify signal voltage switch [ 4.478140] mmc0: new ultra high speed SDR104 SDXC card at address 59b4 [ 4.483022] mmcblk0: mmc0:59b4 USD00 236 GiB. [ 4.499844] mmcblk0: p1 And sometimes the error starts to appear later after boot: [ 2930.738348] mmc0: cannot verify signal voltage switch [ 2990.808748] mmc0: cannot verify signal voltage switch [ 3059.194363] mmc0: cannot verify signal voltage switch The microSD card and the reader were perfectly stable on openSUSE Leap 15.2. The problem is not easily reproducible. It fails only sometimes. The problem does not affect SUSE kernels only. The same problem appears on other 5.x kernels series, and even on other platforms. Arch Linux: https://bbs.archlinux.org/viewtopic.php?id=262551 Manjaro: https://forum.manjaro.org/t/sd-card-reader-not-detected-unless-boot-with-car... Ubuntu: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1929444 - I have the same problem on Hassos on Raspberry Pi 3 with a different card: 4.20 rock stable, 5.8 fails within minutes, 5.13 fails within days. -- You are receiving this mail because: You are the assignee for the bug.