Permission denied: '/sys/class/rtc/rtc0/wakealarm'

[hewfish]

I'm seeing a repeating error in the log PiKVM web log that seems linked to the RTC module. I'm running the latest v3 hat image of PiKVM

PermissionError: [Errno 13] Permission denied: '/sys/class/rtc/rtc0/wakealarm'

Full error log:

[2022-03-16 00:25:07 kvmd-watchdog.service] --- kvmd.apps.watchdog INFO --- Running watchdog loop on RTC0 ... [2022-03-16 00:25:07 kvmd-watchdog.service] --- Traceback (most recent call last): [2022-03-16 00:25:07 kvmd-watchdog.service] --- File "/usr/bin/kvmd-watchdog", line 9, in [2022-03-16 00:25:07 kvmd-watchdog.service] --- main() [2022-03-16 00:25:07 kvmd-watchdog.service] --- File "/usr/lib/python3.10/site-packages/kvmd/apps/watchdog/init.py", line 119, in main [2022-03-16 00:25:07 kvmd-watchdog.service] --- options.cmd(config.watchdog) [2022-03-16 00:25:07 kvmd-watchdog.service] --- File "/usr/lib/python3.10/site-packages/kvmd/apps/watchdog/init.py", line 80, in _cmd_run [2022-03-16 00:25:07 kvmd-watchdog.service] --- _reset_alarm(config.rtc, config.timeout) [2022-03-16 00:25:07 kvmd-watchdog.service] --- File "/usr/lib/python3.10/site-packages/kvmd/apps/watchdog/init.py", line 65, in _reset_alarm [2022-03-16 00:25:07 kvmd-watchdog.service] --- _write_int(rtc, "wakealarm", wake) [2022-03-16 00:25:07 kvmd-watchdog.service] --- File "/usr/lib/python3.10/site-packages/kvmd/apps/watchdog/init.py", line 55, in _write_int [2022-03-16 00:25:07 kvmd-watchdog.service] --- with open(_join_rtc(rtc, key), "w") as value_file: [2022-03-16 00:25:07 kvmd-watchdog.service] --- PermissionError: [Errno 13] Permission denied: '/sys/class/rtc/rtc0/wakealarm'

[hzzfly]

did you try this https://github.com/ThomasVon2021/pikvm-CM4-Board#25real-time-clock-rtc

[hewfish]

Yes, the rtc is loaded and available, however there is not wakealarm under that class

Thanks

On Wed, 16 Mar 2022, 10:23 pm hzzfly, @.***> wrote:

did you try this https://github.com/ThomasVon2021/pikvm-CM4-Board#25real-time-clock-rtc

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[hewfish]

As per my previous comment:

[root@pikvm boot]# cat config.txt 
# See /boot/overlays/README for all available options
initramfs initramfs-linux.img followkernel

hdmi_force_hotplug=1
gpu_mem=128
enable_uart=1
dtoverlay=tc358743
dtoverlay=disable-bt
dtoverlay=dwc2,dr_mode=peripheral
#dtparam=act_led_gpio=13

# HDMI audio capture
dtoverlay=tc358743-audio

# SPI (AUM)
dtoverlay=spi0-1cs

# I2C (display)
dtparam=i2c_arm=on

# Clock
#dtoverlay=i2c-rtc,pcf8563
dtoverlay=i2c-rtc,ds1307

[kvmd-webterm@pikvm rtc0]$ ls
device  subsystem  dev      max_user_freq  since_epoch  uevent
power   date       hctosys  name           time
[kvmd-webterm@pikvm rtc0]$ pwd
/sys/class/rtc/rtc0
[kvmd-webterm@pikvm rtc0]$ 

There is clearly no wakealarm under that tree. Any ideas?

[nmaster2042]

Same issue here.

How to solve this ?

[Martin-HiPi]

That's what happens when your software is meant for PiKVM v3 but used on BliKVM...

The PiKVM v3 team #wontfix since it's not their problem!

[DerTFL]

You can completely disable kvmd-watchdog by

rw
systemctl disable --now kvmd-watchdog
ro

[hewfish]

Disabling the specific wakealarm service seems to remove the log issue, does it have any other detrimental effect?

On Sun, 17 Apr 2022, 6:55 pm DerTFL, @.***> wrote:

You can completely disable kvmd-watchdog by

rw systemctl disable --now kvmd-watchdog ro

— Reply to this email directly, view it on GitHub https://github.com/ThomasVon2021/pikvm-CM4-Board/issues/19#issuecomment-1100834581, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAV6DUJL6X6VHXYZF6E7Y2LVFPGWJANCNFSM5QZ75IAQ . You are receiving this because you authored the thread.Message ID: @.***>

[nmaster2042]

I think it only removes the ability to power on the pi at a defined hour. To be checked and confirmed.

[hewfish]

I don't think the ds1307 chip supports that function anyway, hence why there is no wakealarm function exposed and available.