Looking at the kernel version (4.15.18+) it seems like you are running a custom kernel. Does this problem happen also with the stock Ubuntu kernel? Thanks.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1865129 Title: /dev/rtc missing despite having configs for RTC in kernel Status in linux package in Ubuntu: Incomplete Bug description: At bootup following error is seen: [ 12.041110] rtc_cmos 00:02: RTC can wake from S4 [ 12.098168] rtc_cmos: probe of 00:02 failed with error -16 iotadmin@localhost:~$ cat /proc/version* Linux version 4.15.18+ ([email protected]) (gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1)) #1 SMP Thu Feb 27 21:58:50 PST 2020 I have following configs in my kernel. CONFIG_RTC_LIB=y CONFIG_RTC_MC146818_LIB=y CONFIG_RTC_CLASS=y CONFIG_RTC_SYSTOHC=y CONFIG_RTC_NVMEM=y CONFIG_RTC_INTF_SYSFS=y CONFIG_RTC_INTF_PROC=y CONFIG_RTC_INTF_DEV=y CONFIG_RTC_I2C_AND_SPI=y CONFIG_RTC_DRV_CMOS=y iotadmin@localhost:~$ ls -l /dev/ | grep rtc iotadmin@localhost:~$ iotadmin@localhost:~$ timedatectl Local time: Fri 2020-02-28 09:58:20 UTC Universal time: Fri 2020-02-28 09:58:20 UTC RTC time: n/a Time zone: n/a (UTC, +0000) System clock synchronized: yes systemd-timesyncd.service active: no RTC in local TZ: no iotadmin@localhost:~$ hwclock --debug hwclock from util-linux 2.31.1 System Time: 1582883907.124128 Trying to open: /dev/rtc0 Trying to open: /dev/rtc Trying to open: /dev/misc/rtc No usable clock interface found. hwclock: Cannot access the Hardware Clock via any known method. iotadmin@localhost:~$ iotadmin@localhost:~$ uname -a Linux localhost 4.15.18+ #1 SMP Thu Feb 27 21:58:50 PST 2020 x86_64 x86_64 x86_64 GNU/Linux iotadmin@localhost:~$ iotadmin@localhost:~$ cat /proc/devices Character devices: 1 mem 4 /dev/vc/0 4 tty 4 ttyS 5 /dev/tty 5 /dev/console 5 /dev/ptmx 5 ttyprintk 7 vcs 10 misc 13 input 21 sg 89 i2c 128 ptm 136 pts 180 usb 189 usb_device 204 ttyMAX 242 ptp 243 pps 244 rpmb 245 ttyDBC 246 bsg 247 hmm_device 248 watchdog 249 rtc 250 dax 251 dimmctl 252 ndctl 253 tpm 254 gpiochip Block devices: 7 loop 8 sd 65 sd 66 sd 67 sd 68 sd 69 sd 70 sd 71 sd 128 sd 129 sd 130 sd 131 sd 132 sd 133 sd 134 sd 135 sd 179 mmc 259 blkext To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1865129/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
