If laptop is put to suspend or hibernate by closing lid, via power manager or by using any other method and then it is resumed/waked up, keyboard is not responding but mouse or trackball can be used. Although I can wake laptop up by keyboard, after that I am stuck at the password prompt. This bug is present ever since using 4.10-rc1 kernel and mostly on Sony laptops. The last working kernel version is 4.9.0-rc2.
git bisect points 9d659ae14b545c4296e812c70493bfdc999b5c1c as the first bad commit[1]. I tried some kernel parameters related to i8042 driver: i8042.debug=1 i8042.reset=1 keyboard not working i8042.debug=1 i8042.kbdreset=1 keyboard not working i8042.debug=1 i8042.nomux=1 keyboard not working i8042.debug=1 i8042.noaux=1 keyboard working, but touchpad not working A user reported that on some rare occasions, keyboard responded to key press but it remained pressed forever even if stopped pressing it. And another user reported that passing the options i8042.reset=1 i8042.dumbkbd=1 i8042.direct=1 resulted in the keyboard functioning after resume. However, there was a long delay before the keyboard or mouse responded to input on the lock screen. This one line patch, which can be a hint, from Takashi Iwai essentially reverts the commit 9d659ae14b545 mentioned in the above and keyboard is working as expected after resuming from suspend/hibernate, if this patch is applied. --- a/kernel/locking/mutex.c +++ b/kernel/locking/mutex.c @@ -59,7 +59,7 @@ EXPORT_SYMBOL(__mutex_init); * Bit2 indicates handoff has been done and we're waiting for pickup. */ #define MUTEX_FLAG_WAITERS 0x01 -#define MUTEX_FLAG_HANDOFF 0x02 +#define MUTEX_FLAG_HANDOFF 0x00 #define MUTEX_FLAG_PICKUP 0x04 #define MUTEX_FLAGS 0x07 - The first bug report on bugzilla.kernel.org[2]. - LKML thread[3] - Another report on OpenSUSE bugzilla[4] [1] https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=9d659ae14b545c4296e812c70493bfdc999b5c1c [2] https://bugzilla.kernel.org/show_bug.cgi?id=195471 [3] https://lkml.org/lkml/2018/8/31/707 [4] https://bugzilla.opensuse.org/show_bug.cgi?id=1114588
