I was able to bisect the problem and it first appears with commit
7d36a230401f ("ACPI: x86: cmos_rtc: Create a CMOS RTC platform device"),
which is a backport of upstream commit 1ae2f435350e.The commit was introduced in this update on 22-09-2026: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2167950 It first appeared in tag Ubuntu-7.0.0-39.39 The commit itself is not a stable candidate, but was introduced as dependency of 321660985216 ("ACPI: TAD: Add locking around AML evaluations"), which is a backport of upstream commit a3df8bbe0a70. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2169736 Title: RTC device disappears after updating to 7.0.0-39-generic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2169736/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
