Hi Bjørn, thank you for your estimation.
> Do you have any confirmation that it is actually possible to switch this > firmware into USB mode? Are there other firmwares available with > (possible) USB support? > I don't have a confirmation that the USB mode will really work, especially on the new models. Last year (Lenovo Thinkpad Whiskey Lake series) there was the possibility to choose between the slow modem (Fibocom L830-EB) and the faster option Fibocom L850-GL. This year the slow modem ist the fast modem of the last year and the fast modem is CAT16 Fibocom L860-GL. Regarding the Lenovo Thinkpad Whiskey Lake series models I found some threads where the USB mode switch worked: https://forums.lenovo.com/t5/Other-Linux-Discussions/WWAN-Fibocom-L850-GL-and-Linux-support/m-p/4318903?page=1#4327397 https://gmt-24.net/archives/1461 Thats why I assumed that this might work at newer Thinkpads as well. Especially https://gmt-24.net/archives/1461 shows that your assumption regarding the bootloader and application mode seems to be correct. This comes out directly after disabling the PCIe link and directly after that: [ 162.799214] usb 1-6: new high-speed USB device number 5 using xhci_hcd [ 162.940604] usb 1-6: New USB device found, idVendor=8087, idProduct=07f5, bcdDevice= 0.00 [ 162.940612] usb 1-6: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 169.651754] usb 1-6: USB disconnect, device number 5 Now bcdDevice changed to real device id. [ 175.462630] usb 1-6: new high-speed USB device number 6 using xhci_hcd [ 175.620153] usb 1-6: New USB device found, idVendor=2cb7, idProduct=0007, bcdDevice= 3.33 [ 175.620162] usb 1-6: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 175.620167] usb 1-6: Product: L850-GL [ 175.620172] usb 1-6: Manufacturer: Fibocom Wireless Inc. [ 175.620176] usb 1-6: SerialNumber: 004999010640000 > Anyway, FWIW, I'd explore the PCIe driver option first if I were you. > That's the only mode tested by anyone, so it is more likely to work. Ok, I will try that approach and let you know my results. Thank you & best regards, Dennis On Thu, 2020-06-18 at 15:36 +0200, Bjørn Mork wrote: > "Wassenberg, Dennis" <dennis.wassenb...@secunet.com> writes: > > > After that dmesg shows this: > > [ 930.843781] usb 1-7: new high-speed USB device number 16 using xhci_hcd > > [ 930.996572] usb 1-7: New USB device found, idVendor=8087, idProduct=07f5, > > bcdDevice= 0.00 > > [ 930.996577] usb 1-7: New USB device strings: Mfr=0, Product=0, > > SerialNumber=0 > > [ 937.683939] usb 1-7: USB disconnect, device number 16 > > > > So, in general I think there should be USB lines routed to the M.2 slot but > > I have no idea why the device leaves the > > bus. It is possible to run the script again and again but in the end it > > will always disconnect automatically. > > I know nothing about these modems, but my guess is that this is a > bootloader mode. Mostly based on the assumption that there will be one, > and that the vendor-id will be something non-Intel in application mode. > > You can probably confirm this by capturing the full device descriptor, > e.g by creating a udev rule to dump it or simply by snooping on the bus. > > If this assumption is correct, then the firmware was supposed to boot > into an application mode and then reconnect to the USB bus with its real > device ID and descriptors. This could be failing due to a firmware > crash, maybe caused by this unexpected state. Or more likely: The > firmware on this modem is built without support for the USB mode. > > Do you have any confirmation that it is actually possible to switch this > firmware into USB mode? Are there other firmwares available with > (possible) USB support? > > > Anyway, FWIW, I'd explore the PCIe driver option first if I were you. > That's the only mode tested by anyone, so it is more likely to work. > > > > Bjørn _______________________________________________ ModemManager-devel mailing list ModemManager-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/modemmanager-devel
