Thank you Paul have not thought it would be linked to the 3V regulator. Will have a probe and also look at powering modem from bench supply to monitor current usage.
> -----Original Message----- > From: ModemManager-devel <modemmanager-devel- > boun...@lists.freedesktop.org> On Behalf Of Paul Bartell > Sent: 05 July 2021 19:44 > To: ModemManager (development) <modemmanager- > de...@lists.freedesktop.org> > Subject: Re: Quectel and Telit issues > > I've seen similar messages in the past due to power supply issues. > > If you have an oscilloscope available, probe the main power supply line to > your modem module and verify that the input voltage does not drop below > the allowable input voltage. > > You may need to add more bulk capacitance to your board that performs > well at higher frequencies (ceramic or polymer instead of tantalum) and / or > increase the output voltage of the DC-DC converter feeding the module (if it's > not shared with other parts of your board). > > On Mon, Jul 5, 2021 at 11:27 AM Mark Deneen <mden...@gmail.com> > wrote: > > > > I use a Telit LE910 on newer kernels (5.10.x) without issue. > > > > On Mon, Jul 5, 2021, 09:03 Marc Murphy <marcm...@marcm.co.uk> > wrote: > >> > >> Hello All > >> > >> Been looking at an issue on my embedded device. Have previously been > using SierraWireless MC7430 and Huawei module without issues. > >> I have recently changed to try a Telit 910 and a Quectel EG21-G and get : > > > > _______________________________________________ > > ModemManager-devel mailing list > > ModemManager-devel@lists.freedesktop.org > > https://lists.freedesktop.org/mailman/listinfo/modemmanager-devel > _______________________________________________ > ModemManager-devel mailing list > ModemManager-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/modemmanager-devel _______________________________________________ ModemManager-devel mailing list ModemManager-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/modemmanager-devel
