Suspend and Resume with the Hauppauge 2250 card

[TV_Hacker]

I was able to get wake from suspend working with the Hauppauge 2250 on Ubuntu 24.04 Linux.

The driver in use is saa7164.

The driver would lock up once the system went to suspend so resume would result in an unusable system.
I would have to completely power down the system to get it working again.
I thought I had it solved by unloading the driver, but the driver would fail when trying to reload upon resume. 
Solution was to clear memory cache before suspend.

Solution:

/usr/lib/systemd/system-sleep/saa7164_driver_handler.sh
Need execute permissions on the script:
(-rwxr-xr-x 1 root root 584 Jan  7 23:23 saa7164_driver_handler.sh)

#!/bin/bash
DRIVER="saa7164" # Replace driver_name with your specific driver

case "${1}" in
    pre)
        # Actions to take BEFORE suspend
        echo "Stopping nextpvr-server..."
        systemctl stop nextpvr-server
        echo "Unloading $DRIVER modules..."
        modprobe -r $DRIVER
        sync
        echo 3 > /proc/sys/vm/drop_caches
        ;;
    post)
        # Actions to take AFTER resume
        echo "Loading $DRIVER modules..."
        modprobe $DRIVER
        echo "Starting nextpvr-server..."
        systemctl start nextpvr-server
        ;;
esac

I also required the devices to be loaded before the nextpvr-server would be allow to start

In /usr/lib/systemd/system/nextpvr-server.service

[Unit]
Description=NextPVRServer
After=network-online.target
Wants=dev-dvb-adapter0-frontend0.device
After=dev-dvb-adapter0-frontend0.device
Wants=dev-dvb-adapter1-frontend0.device
After=dev-dvb-adapter1-frontend0.device

[mvallevand]

Just out of curiosity are you saying that running pkill DeviceHostLinux instead of stopping the server didn't work on sleep? I have the 2250 and it basically worked using something similar to your script based on this https://wiki.mythtv.org/wiki/Suspend_and_saa7164

Martin

[TV_Hacker]

For me it did not always work to just unload the driver before sleep and then reload on wake.
I had to add the line:
echo 3 > /proc/sys/vm/drop_caches

But I have discovered that does not always work either. Works most of the time.
I have not tried pkill DeviceHostLinux. (Not sure what the does?)

I have now decided the best course of action is not to allow Suspend. I have the computer shutdown at end of the day. Before shutdown it checks the nextpvr database for the next recording time and will set an rtc alarm to wake up for the next scheduled recording.

[mvallevand]

DeviceHostWindows opens /dev/dvb/adapter.. and doesn't release it after recording so the pkill releases the adapter without shutting the backend down completely. Agreed it is not a good device to suspend.

Martin