Bug#992637: Dropped packets/high latency on USB bus when using USB oscilloscope in bullseye
Thank you for the suggestion, I booted the old kernel and the new
kernel and compared their tuneables screen to check for differences -
on the new kernel there is a setting "Autosuspend for USB device DSO-
6022BE [OpenHantek]" (which is the device in question) which wasn't
present on the old kernel. Enabling/disabling it however has no effect
(it was set to "Bad" anyway). The only other difference between the
kernels is the runtime pm for my audio controller (which also didn't
make a difference).
On Sat, 2021-08-21 at 16:57 +0200, Diederik de Haas wrote:
> On zaterdag 21 augustus 2021 16:42:21 CEST Kobus van Schoor wrote:
> > - My battery lasts significantly longer after upgrading to bullseye
> > (around 2 hours extra I would guess). I'm not sure if there is now
> > extra power saving features present in the kernel which might be
> > interfering with my USB bus.
>
> With 'powertop' there's a screen named 'Tunables' and there you can
> enable or
> disable various power related settings.
> Where there previously was a whole list of settings I had to manually
> enable,
> since recently they're all enabled by default. In my case I disable a
> setting
> wrt my mouse otherwise it responds poorly.
>
> With 'lsusb [-t]' you should be able to detect where your device is
> connected
> to and find a matching tunable in powertop and see whether that
> helps.
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