Arch Linux User Repository

I finally had time to investigate the issue. It looks like that as of 11.5, the DesktopVideoHelper.service has to be running for the capture card to work properly.

REMAKE_INITRD is deprecated and should probably be removed from dkms.conf

It doesn't really cause problems, but it would probably be best practice that way, to get rid of warnings.

Thanks, I pushed a new version with a patch inspired by yours. Let me know if it does not work on kernel 5.15 and newer.

Patch for kernel 5.15, which deprecated alloc_tty_driver and put_tty_driver:

--- package.orig/Blackmagic_Desktop_Video_Linux_12.2/other/x86_64/desktopvideo-12.2a12-x86_64/usr/src/blackmagic-12.2a12/blackmagic_serial.c    2021-11-04 17:18:37.053086911 +0100
+++ package.new/Blackmagic_Desktop_Video_Linux_12.2/other/x86_64/desktopvideo-12.2a12-x86_64/usr/src/blackmagic-12.2a12/blackmagic_serial.c 2021-11-04 17:30:49.791835250 +0100
@@ -613,7 +613,7 @@
    int ret;
    struct tty_driver *driver;

-   driver = alloc_tty_driver(BLACKMAGIC_SERIAL_MINORS);
+   driver = tty_alloc_driver(BLACKMAGIC_SERIAL_MINORS, 0);
    if (!driver)
        return -ENOMEM;

@@ -639,7 +639,7 @@

 abort:
    printk(KERN_ERR "failed to register blackmagic serial driver");
-   put_tty_driver(driver);
+   tty_driver_kref_put(driver);
    return ret;
 }

@@ -648,6 +648,6 @@
    if (blackmagic_tty_driver)
    {
        tty_unregister_driver(blackmagic_tty_driver);
-       put_tty_driver(blackmagic_tty_driver);
+       tty_driver_kref_put(blackmagic_tty_driver);
    }
 }
diff --unified --recursive --text --color package.orig/Blackmagic_Desktop_Video_Linux_12.2/other/x86_64/desktopvideo-12.2a12-x86_64/usr/src/blackmagic-io-12.2a12/bmio_serial.c package.new/Blackmagic_Desktop_Video_Linux_12.2/other/x86_64/desktopvideo-12.2a12-x86_64/usr/src/blackmagic-io-12.2a12/bmio_serial.c
--- package.orig/Blackmagic_Desktop_Video_Linux_12.2/other/x86_64/desktopvideo-12.2a12-x86_64/usr/src/blackmagic-io-12.2a12/bmio_serial.c   2021-11-04 17:18:37.053086911 +0100
+++ package.new/Blackmagic_Desktop_Video_Linux_12.2/other/x86_64/desktopvideo-12.2a12-x86_64/usr/src/blackmagic-io-12.2a12/bmio_serial.c    2021-11-04 17:29:38.749443820 +0100
@@ -304,7 +304,7 @@
 {
    int ret;

-   struct tty_driver* serial = alloc_tty_driver(MAX_SERIAL_LINES);
+   struct tty_driver* serial = tty_alloc_driver(MAX_SERIAL_LINES, 0);
    if (!serial)
        return -ENOMEM;

@@ -324,7 +324,7 @@
    ret = tty_register_driver(serial);
    if (ret)
    {
-       put_tty_driver(serial);
+       tty_driver_kref_put(serial);
        return ret;
    }

@@ -340,7 +340,7 @@
    if (serial_driver)
    {
        tty_unregister_driver(serial_driver);
-       put_tty_driver(serial_driver);
+       tty_driver_kref_put(serial_driver);
        serial_driver = NULL;
    }
 }

awesome, also working here on 5.14.3-arch1-1 -- happy to be able to update the system, was holding off until now since I rely on the decklink drivers, using it everyday -- thanks for the package update! FWIW it did require a reboot for the device to be found by BlackmagicDesktopVideoSetup.

Can confirm it works for me too with 5.14.2.arch1-2. Thanks for updating the PKGBUILD.

EDIT: Though, the audio stutters quite badly. I'll have to see if I can get that fixed...

EDIT2: happens on Windows too, I think it may have to do with PCI bandwidth available. I get a warning about dropped frames when I record with MediaExpress. But there's not as many dropped frames when I record a 720p60 signal vs 1080p60.

EDIT3: yeah that was it. Unplugging the TV tuner card I never use gave me the PCI bandwidth the card needs to work properly.

edit - sorry, I don't know the half markdown syntax here. deleted my PKGBUILD patch.

edit2: sorry for the lame workaround - uploaded a PKGBUILD gist here: https://gist.github.com/frostworx/6f1c12bdf5c0f319bcbd0ef18e3e301b

edit3: I can confirm that the decklink works fine with 5.14.2-xanmod1-1 with the patched drivers

thx for the quick reply! just gave it a quick try. The patch applies fine, but when manually building the build fails with "bmio_serial.c:174:28: Fehler: Initialisierung von »unsigned int ()(struct tty_struct )« von inkompatiblem Zeigertyp »int ()(struct tty_struct )« [-Werror=incompatible-pointer-types]" (the other module blackmagic-12.1a9 has the same error). the Werror can be disabled by adding "-Wno-error=incompatible-pointer-types" to the EXTRA_CFLAGS in the Makefiles. Both modules build fine then. Haven't tested functionality, as I'm almost off for a short trip \o/ :) Good luck and thanks a lot for maintaining the PKGBUILD! :)

thx, I'll try the patch later today after work. If it builds on my machine I'll push a new revision to the decklink package.

fyi: a blackmagic dev posted a patch in the thread mentioned before here: https://forum.blackmagicdesign.com/viewtopic.php?f=12&t=144876#p788448 haven't tested it yet

fyi, upstream forum issue thread: https://forum.blackmagicdesign.com/viewtopic.php?f=12&t=144876