Hi Sean, I'll have a go at using bisection. Attached is the output of dmesg, when I started a scan of adapter1 the following occurred - usb usb1-port1: disabled by hub (EMI?), re-enabling... and when I closed the terminal window the USB ports re-enabled. On Fri, 13 Aug 2021 at 18:54, Sean Young <sean@xxxxxxxx> wrote: > > Hi Andrew, > > On Fri, Aug 13, 2021 at 10:21:04AM +1000, Andrew Goff wrote: > > Hi, I hope this is the right place for posting this. > > > > I have the above TV tuner / capture device which has been working well > > in Ubuntu 16.04. I've decided to update the OS to Ubuntu 20.04 with a > > fresh install on a different disk and haven't been able to get this > > device working. > > > > Ubuntu 21.04, 18.04 have also been tested with the same results. On a > > fresh install of 16.04 this device works well. > > > > It seems something has changed between 16.04 (kernel 4.15.0-142) and > > 18.04 (kernel 5.4.0-42). > > > > In /etc/modprobe.d/dvb.conf > > # Sony Play TV > > options dvb-usb-dib0700 adapter_nr=5,6 force_lna_activation=1 > > > > This has been tested with different variations of the above without success. > > > > When using w_scan with a file manager open I've noticed if scanning > > adapter6 I could see the folder named adapter5 disappear. I then > > opened up the adapter6 folder and two of the four files had > > disappeared. When the scan finished the files/folder reappeared, > > however the device then became unusable. > > > > 'modinfo dvb_usb_dib0700 | grep depends' yields the following > > > > For Ubuntu 18.04 > > depends: > > dib7000m,dib9000,dibx000_common,dvb-usb,dib0090,dib0070,dib3000mc,rc-core > > > > For Ubuntu 16.04 > > depends: dib7000m,dvb-usb,dib0090,dib0070,dib3000mc,rc-core > > > > So something has changed in the driver? > > > > Please let me know if any further information is required to help fix this. > > This does sound like a regression, but we'll have to figure out what > caused this. First of all, is there any output in dmesg when the device > does not work? > > Secondly, the best way to track this down is using bisection. Is this > something you could do? This would be enormously helpful. > > https://www.kernel.org/doc/html/latest/admin-guide/bug-bisect.html > > Thanks, > > Sean
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dmesg2021-08-14
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