Hello, After updating to the 5.10 kernel, my laptop will spontaneously poweroff when idle after some time (between 30 minutes and three days). I have bisected it down to a rtsx driver update in 7c33e3c4c79a: commit 7c33e3c4c79ac5def79e7c773e38a7113eb14204 Author: Ricky Wu Date: Mon Sep 7 18:07:31 2020 +0800 misc: rtsx: Add power saving functions and fix driving parameter v4: split power down flow and power saving function to two patch v5: fix up modified change under the --- line Add rts522a L1 sub-state support Save more power on rts5227 rts5249 rts525a rts5260 Fix rts5260 driving parameter Signed-off-by: Ricky Wu Link: https://lore.kernel.org/r/20200907100731.7722-1-ricky_wu@realtek.com Signed-off-by: Greg Kroah-Hartman drivers/misc/cardreader/rts5227.c | 112 +++++++++++++++++++++++++++- drivers/misc/cardreader/rts5249.c | 145 ++++++++++++++++++++++++++++++++++++- drivers/misc/cardreader/rts5260.c | 28 +++---- drivers/misc/cardreader/rtsx_pcr.h | 17 +++++ 4 files changed, 283 insertions(+), 19 deletions(-) (See also .) I'm not sure whether this is a driver or hardware problem and am seeking feedback on how to further debug the issue. FWIW the problem does not seem to reproduce on an AMD ThinkPad T14 Gen 1 with the same RTS522A PCIe card reader (on stock Arch 5.10.16 kernel). Thanks & happy hacking, Marius