Changes between Version 51 and Version 52 of wireless/modem


Ignore:
Timestamp:
03/31/2020 07:13:23 PM (4 years ago)
Author:
Tim Harvey
Comment:

added note about USB autosuspend

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  • wireless/modem

    v51 v52  
    21132113Many modems of the future are coming in the M.2 form factor.
    21142114Gateworks uses Mini-PCIe slots, but M.2 adapters can be used, as described on the [wiki:m2 M.2 Wiki Page]
     2115
     2116
     2117
     2118[=#autosuspend]
     2119== Linux USB Auto-suspend
     2120USB autosuspend is problematic with several embedded SoC's due to host controller chip errata. This is the case for both the i.MX6 on Ventana and the CN80XX on Newport. To work around these errata we find it safest to just disable USB autosuspend with a kernel command-line argument of 'usbcore.autosuspend=-1'. This is done in several of our bootscripts.
     2121
     2122USB Modems are especially susceptible to USB auto-suspend issues as they can detach from the USB bus automatically once or twice while powering up.