[LAU] Scarlett 18i8 3rd Gen - insistent click noises but no xruns

Peter list at schmitteckert.com
Sun Nov 17 21:46:39 CET 2019

Dear Marcod,

I can't help you with your problem, but since it is a Scarlett 18i8 3rd Gen
you might be interested in the following thread, concerning a 18i8 3rd Gen driver
beyond usb audio class compliance:
< https://linuxmusicians.com/viewtopic.php?f=6&t=20669 >

Best regards,

Am 12.11.19 um 14:26 schrieb marcod:
> Hi all,
> I've originally posted this issue on the Linux Musicians forum, and despite
> having received several suggestions, we were not able to solve the issue.
> (for those interested in the previous thread:
> https://linuxmusicians.com/viewtopic.php?f=27&t=20629)
> I'm an experienced Linux Audio user and have utilised a fair amount of
> soundcards on Linux systems.
> I've read most of the Scarlett 2nd Gen. post I could find here and
> elsewhere, and noticed there's little info about the 3rd Gen.
> I'm taking this chance to share my experience with a 18i8 3rd Gen. and see
> if my problem can be solved.
> I'm on a DELL M4800 Precision, Linux Mint 19 with Cinnamon, kernel
> 4.15.0-66-lowlatency.
> Soundcard: Focusrite Scarlett 18i8 3rd Generation. I'm in the audio group
> and the audio group has access to RT.
> After the necessary tricks to force the soundcard out of MSD Storage mode,
> now the device is recognised by and fully functioning with both Pulseaudio
> and Jackd. However.....
> When using the soundcard (either via Pulseaudio or via Qjackctl), I can hear
> click noises at almost regular intervals. The clicks vary in loudness (some
> are very loud, other almost unnoticeable). Independently from the CPU or
> Disk usage, the clicks are always there, making the soundcard effectively
> unusable.
> Interestingly, when using the card via Qjackctl I see no XRuns, but I do
> clearly hear the clicks.
> I excluded a defected soundcard, broken USB cable or USB port issues
> (sometimes USB3 can cause troubles) because when using the soundcard on a
> Windows partition on the same computer, the sound is clean, no clicks.
> Although, perhaps I'm missing something here.
> Running realTimeConfigQuickScan gives me a mostly positive check, the only
> "not good" items are the following ones:
> - Checking swappiness... 60
> - Checking checking sysctl inotify max_user_watches... < 524288
> - Checking access to the high precision event timer... not readable
> - Checking access to the real-time clock... not readable
> - Kernel with Real-Time Preemption... not found
> these "not good" items have always been the same on my laptop, and they
> never gave me troubles with two other Scarlett soundcards. I've also read on
> the ConfigQuickScan page that - except Swappiness - the other items are not
> so important these days any more. So I'm assuming the clicks with the
> Scarlett 18i8 3rd Gen. are likely not related to any of those items. But I
> may be wrong...
> I've also tested with 48000 and 44100, no difference.
> Does anyone have any hint on the issue? Or other things I could check?
> thanks in advance,
> --
> Sent from: http://linux-audio.4202.n7.nabble.com/linux-audio-user-f5.html
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