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Linux can't detect PCIe device at all

i have recently upgraded my wwan modem from the sierra wireless MC 7355 to the 7455.
with this new modem, "mmcli --scan-modems " shows nothing. there’s no sign of this modem in lspci or lsusb.

my system is using Debian GNU/Linux 10, and modemmanager worked fine with the MC7355.

what do i need to do to get modemmanager to use the MC7455?
not sure if it helps, but here is my dmesg:
full.txt (71.8 KB)

So I was doing something similar today.

Is /etc/apt/sources.list already with “main contrib non-free” on all of those? If not go there with gedit, nano or vi, emacs, whatever, and make all of the sources * main contrib non-free*

My adapter is usb, already knew it was realtek so I just went on and after adding the non-free, and then made apt install realtek-firmware… (after an update)

Try usb tethering/cableing to search the sierra firmware.

Here’s a list with the firmwares available:

firmware-ralink

* Ralink RT2561 (RT2501/RT5201 chipset) firmware, version 1.2 (rt2561.bin)
 * Ralink RT2561S (RT2501 Turbo/RT5201 Turbo chipset) firmware, version 1.2 (rt2561s.bin)
 * Ralink RT2661 (RT2600/RT5600 chipset) firmware, version 1.2 (rt2661.bin)
 * Ralink RT2760/RT2790/RT2860/RT2890/RT3090 (RT2700P[D]/RT2700E[D]/RT2800P[D]/RT2800E[D]
/RT3000E[D] chipset) firmware, version 34 (rt2860.bin, rt3090.bin)
 * Ralink RT2870/RT3070/RT3071/RT3072 (RT2800U[D] chipset) firmware, version 29 (rt2870.bin, 
rt3070.bin)
 * Ralink RT3071/RT3072 firmware, version 29 (rt3071.bin)
 * Ralink RT2571W/RT2671 (RT2501USB/RT5201USB chipset) firmware, version 1.8 (rt73.bin)
 

firmware-atheros

* Atheros AR3012 rev 01020001 patch (ar3k/AthrBT_0x01020001.dfu)
 * Atheros AR3012 rev 01020200 patch (ar3k/AthrBT_0x01020200.dfu)
 * Atheros AR3012 rev 01020201 patch (ar3k/AthrBT_0x01020201.dfu)
 * Atheros AR3012 rev 11020000 patch (ar3k/AthrBT_0x11020000.dfu)
 * Atheros AR3012 rev 31010000 patch (ar3k/AthrBT_0x31010000.dfu)
 * Atheros AR3012 rev 41020000 patch (ar3k/AthrBT_0x41020000.dfu)
 * Atheros AR3012 rev 01020001 config (ar3k/ramps_0x01020001_26.dfu)
 * Atheros AR3012 rev 01020200 26 MHz config
   (ar3k/ramps_0x01020200_26.dfu)
 * Atheros AR3012 rev 01020200 40 MHz config
   (ar3k/ramps_0x01020200_40.dfu)
 * Atheros AR3012 rev 01020201 26 MHz config
   (ar3k/ramps_0x01020201_26.dfu)
 * Atheros AR3012 rev 01020201 40 MHz config
   (ar3k/ramps_0x01020201_40.dfu)
 * Atheros AR3012 rev 11020000 config (ar3k/ramps_0x11020000_40.dfu)
 * Atheros AR3012 rev 31010000 config (ar3k/ramps_0x31010000_40.dfu)
 * Atheros AR3012 rev 41020000 config (ar3k/ramps_0x41020000_40.dfu)
 * Atheros AR5523 firmware (ar5523.bin)
 * Atheros AR7010 rev 1.0 firmware (ar7010.fw)
 * Atheros AR7010 rev 1.1 firmware (ar7010_1_1.fw)
 * Atheros AR9170 firmware (ar9170.fw)
 * Atheros AR9271 firmware (ar9271.fw)
 * Atheros AR3011 firmware (ath3k-1.fw)
 * ath6k/AR6003.1/hw2.1.1/athwlan.bin
 * ath6k/AR6003.1/hw2.1.1/bdata.SD31.bin
 * ath6k/AR6003.1/hw2.1.1/bdata.SD32.bin
 * ath6k/AR6003.1/hw2.1.1/bdata.WB31.bin
 * ath6k/AR6003.1/hw2.1.1/data.patch.bin
 * ath6k/AR6003.1/hw2.1.1/endpointping.bin
 * ath6k/AR6003.1/hw2.1.1/otp.bin
 * ath6k/AR6003/hw1.0/athwlan.bin.z77
 * ath6k/AR6003/hw1.0/bdata.SD31.bin
 * ath6k/AR6003/hw1.0/bdata.SD32.bin
 * ath6k/AR6003/hw1.0/bdata.WB31.bin
 * ath6k/AR6003/hw1.0/data.patch.bin
 * ath6k/AR6003/hw1.0/otp.bin.z77
 * ath6k/AR6003/hw2.0/athwlan.bin.z77
 * ath6k/AR6003/hw2.0/bdata.SD31.bin
 * ath6k/AR6003/hw2.0/bdata.SD32.bin
 * ath6k/AR6003/hw2.0/bdata.WB31.bin
 * ath6k/AR6003/hw2.0/data.patch.bin
 * ath6k/AR6003/hw2.0/otp.bin.z77
 * ath6k/AR6003/hw2.1.1/athwlan.bin
 * ath6k/AR6003/hw2.1.1/bdata.SD31.bin
 * ath6k/AR6003/hw2.1.1/bdata.SD32.bin
 * ath6k/AR6003/hw2.1.1/bdata.WB31.bin
 * ath6k/AR6003/hw2.1.1/data.patch.bin
 * ath6k/AR6003/hw2.1.1/endpointping.bin
 * ath6k/AR6003/hw2.1.1/fw-2.bin
 * ath6k/AR6003/hw2.1.1/fw-3.bin
 * ath6k/AR6003/hw2.1.1/otp.bin
 * ath6k/AR6004/hw1.2/bdata.bin
 * ath6k/AR6004/hw1.2/fw-2.bin
 * ath6k/AR6004/hw1.3/bdata.bin
 * ath6k/AR6004/hw1.3/fw-3.bin
 * Atheros AR7010 firmware, version 1.3 (htc_7010.fw)
 * Atheros AR9271 firmware, version 1.3 (htc_9271.fw)

firmware-realtek

* Realtek RTL8192E boot code (RTL8192E/boot.img)
 * Realtek RTL8192E init data (RTL8192E/data.img)
 * Realtek RTL8192E main code (RTL8192E/main.img)
 * Realtek RTL8192SU firmware, version 902B (RTL8192SU/rtl8192sfw.bin)
 * Realtek RTL8105E-1 firmware (rtl_nic/rtl8105e-1.fw)
 * Realtek RTL8106E-1 firmware, version 0.0.1 (rtl_nic/rtl8106e-1.fw)
 * Realtek RTL8106E-2 firmware, version 0.0.1 (rtl_nic/rtl8106e-2.fw)
 * Realtek RTL8111D-1/RTL8168D-1 firmware (rtl_nic/rtl8168d-1.fw)
 * Realtek RTL8111D-2/RTL8168D-2 firmware (rtl_nic/rtl8168d-2.fw)
 * Realtek RTL8168E-1 firmware (rtl_nic/rtl8168e-1.fw)
 * Realtek RTL8168E-2 firmware (rtl_nic/rtl8168e-2.fw)
 * Realtek RTL8168E-3 firmware, version 0.0.4 (rtl_nic/rtl8168e-3.fw)
 * Realtek RTL8168F-1 firmware, version 0.0.5 (rtl_nic/rtl8168f-1.fw)
 * Realtek RTL8168F-2 firmware, version 0.0.4 (rtl_nic/rtl8168f-2.fw)
 * Realtek RTL8168G-1 firmware, version 0.0.3 (rtl_nic/rtl8168g-1.fw)
 * Realtek RTL8168G-2 firmware, version 0.0.1 (rtl_nic/rtl8168g-2.fw)
 * Realtek RTL8168G-3 firmware, version 0.0.1 (rtl_nic/rtl8168g-3.fw)
 * Realtek RTL8402-1 firmware, version 0.0.1 (rtl_nic/rtl8402-1.fw)
 * Realtek RTL8411-1 firmware, version 0.0.3 (rtl_nic/rtl8411-1.fw)
 * Realtek RTL8411-2 firmware, version 0.0.1 (rtl_nic/rtl8411-2.fw)
 * Realtek RTL8188EE firmware (rtlwifi/rtl8188efw.bin)
 * Realtek RTL8188EU firmware (rtlwifi/rtl8188eufw.bin)
 * Realtek RTL8192CE/RTL8188CE firmware, version 4.816.2011
   (rtlwifi/rtl8192cfw.bin)
 * Realtek RTL8192CE/RTL8188CE B-cut firmware, version 4.816.2011
   (rtlwifi/rtl8192cfwU_B.bin)
 * Realtek RTL8188CE A-cut firmware, version 4.816.2011
   (rtlwifi/rtl8192cfwU.bin)
 * Realtek RTL8192CU/RTL8188CU UMC A-cut firmware
   (rtlwifi/rtl8192cufw_A.bin)
 * Realtek RTL8192CU/RTL8188CU UMC B-cut firmware
   (rtlwifi/rtl8192cufw_B.bin)
 * Realtek RTL8192CU/RTL8188CU TMSC firmware
   (rtlwifi/rtl8192cufw_TMSC.bin)
 * Realtek RTL8192CU/RTL8188CU fallback firmware
   (rtlwifi/rtl8192cufw.bin)
 * Realtek RTL8192DE firmware, version 4.816.2011
   (rtlwifi/rtl8192defw.bin)
 * Realtek RTL8192SE/RTL8191SE firmware, version 4.816.2011
   (rtlwifi/rtl8192sefw.bin)
 * Realtek RTL8192SU/RTL8712U firmware (rtlwifi/rtl8712u.bin)
 * Realtek RTL8723AU rev B with-Bluetooth firmware
   (rtlwifi/rtl8723aufw_B.bin)
 * Realtek RTL8723AU rev B no-Bluetooth firmware
   (rtlwifi/rtl8723aufw_B_NoBT.bin)
 * Realtek RTL8723BE firmware (rtlwifi/rtl8723befw.bin)
 * Realtek RTL8723AE rev B firmware (rtlwifi/rtl8723fw_B.bin)
 * Realtek RTL8723AE rev A firmware (rtlwifi/rtl8723fw.bin)
 * Realtek RTL8821AE firmware (rtlwifi/rtl8821aefw.bin)

firmware-iwlwifi

* Intel Wireless 3160 rev 10 Bluetooth firmware patch
   (intel/ibt-hw-37.7.10-fw-1.0.2.3.d.bseq)
 * Intel Wireless 7260 rev 10 WP2 B5 Bluetooth firmware path
   (intel/ibt-hw-37.7.10-fw-1.80.1.2d.d.bseq)
 * Intel Wireless 7260 rev 10 Bluetooth firmware patch
   (intel/ibt-hw-37.7.10-fw-1.80.2.3.d.bseq)
 * Intel Wireless 7260 Bluetooth firmware generic patch
   (intel/ibt-hw-37.7.bseq)
 * Intel Wireless 7265 rev 10 Bluetooth firmware generic patch
   (intel/ibt-hw-37.8.10-fw-1.10.2.27.d.bseq)
 * Intel Wireless 7265 Bluetooth firmware generic patch
   (intel/ibt-hw-37.8.bseq)
 * Intel Wireless 100 firmware, version 39.31.5.1 (iwlwifi-100-5.ucode)
 * Intel Wireless 105 firmware, version 18.168.6.1
   (iwlwifi-105-6.ucode)
 * Intel Wireless 135 firmware, version 18.168.6.1
   (iwlwifi-135-6.ucode)
 * Intel Wireless 1000 firmware, version 39.31.5.1
   (iwlwifi-1000-5.ucode)
 * Intel Wireless 2200 firmware, version 18.168.6.1
   (iwlwifi-2000-6.ucode)
 * Intel Wireless 2230 firmware, version 18.168.6.1
   (iwlwifi-2030-6.ucode)
 * Intel Wireless 3160 firmware, version 22.1.7.0
   (iwlwifi-3160-7.ucode)
 * Intel Wireless 3160 firmware, version 22.24.8.0
   (iwlwifi-3160-8.ucode)
 * Intel Wireless 3160 firmware, version 23.214.9.0
   (iwlwifi-3160-9.ucode)
 * Intel Wireless 3945 firmware, version 15.32.2.9
   (iwlwifi-3945-2.ucode)
 * Intel Wireless 4965 firmware, version 228.61.2.24
   (iwlwifi-4965-2.ucode)
 * Intel Wireless 5100, 5300 and 5350 firmware, version 8.24.2.12
   (iwlwifi-5000-2.ucode)
 * Intel Wireless 5100, 5300 and 5350 firmware, version 8.83.5.1
   (iwlwifi-5000-5.ucode)
 * Intel Wireless 5150 firmware, version 8.24.2.2
   (iwlwifi-5150-2.ucode)
 * Intel Wireless 6000 firmware, version 9.221.4.1
   (iwlwifi-6000-4.ucode)
 * Intel Wireless 6005/6205 firmware, version 17.168.5.3
   (iwlwifi-6000g2a-5.ucode)
 * Intel Wireless 6005/6205 firmware, version 18.168.6.1
   (iwlwifi-6000g2a-6.ucode)
 * Intel Wireless 6030 firmware, version 18.168.6.1
   (iwlwifi-6000g2b-6.ucode)
 * Intel Wireless 6250 firmware, version 9.201.4.1
   (iwlwifi-6050-4.ucode)
 * Intel Wireless 6250 firmware, version 41.28.5.1
   (iwlwifi-6050-5.ucode)
 * Intel Wireless 7260 firmware, version 22.1.7.0
   (iwlwifi-7260-7.ucode)
 * Intel Wireless 7260 firmware, version 22.24.8.0
   (iwlwifi-7260-8.ucode)
 * Intel Wireless 7260 firmware, version 23.214.9.0
   (iwlwifi-7260-9.ucode)
 * Intel Wireless 7265 firmware, version 22.24.8.0
   (iwlwifi-7265-8.ucode)
 * Intel Wireless 7265 firmware, version 23.214.9.0
   (iwlwifi-7265-9.ucode)

firmware-b43-installer

* BCM4306/3;
 * BCM4311;
 * BCM4318;
 * BCM4321;
 * BCM4322 (only 14e4:432b);
 * BCM4312 (with Low-Power a.k.a. LP-PHY).

firmware-b43legacy-installer

* BCM4301;
 * BCM4306/2;
 * BCM4306.

atmel-firmware

* at76c50x.

 firmware-brcm80211

* Broadcom 802.11 firmware, version 610.812 (brcm/bcm43xx-0.fw)
 * Broadcom 802.11 firmware header, version 610.812
   (brcm/bcm43xx_hdr-0.fw)
 * Broadcom BCM43143 firmware (brcm/brcmfmac43143-sdio.bin)
 * Broadcom BCM43241 rev 0-3 firmware (brcm/brcmfmac43241b0-sdio.bin)
 * Broadcom BCM43241 rev 4+ firmware (brcm/brcmfmac43241b4-sdio.bin)
 * Broadcom BCM4329 firmware (brcm/brcmfmac4329-sdio.bin)
 * Broadcom BCM4330 firmware (brcm/brcmfmac4330-sdio.bin)
 * Broadcom BCM4334 firmware (brcm/brcmfmac4334-sdio.bin)
 * Broadcom BCM4335 firmware (brcm/brcmfmac4335-sdio.bin)
 * Broadcom BCM43362 firmware (brcm/brcmfmac43362-sdio.bin)
 * Broadcom BCM4354 firmware (brcm/brcmfmac4354-sdio.bin)

firmware-ipw2x00

* Intel Pro Wireless 2100 firmware (bootstrap), version 1.3
   (ipw2100-1.3.fw)
 * Intel Pro Wireless 2100 firmware (ibss mode), version 1.3
   (ipw2100-1.3-i.fw)
 * Intel Pro Wireless 2100 firmware (monitor mode), version 1.3
   (ipw2100-1.3-p.fw)
 * Intel Pro Wireless 2200/2915 firmware (bss), version 3.1
   (ipw2200-bss.fw)
 * Intel Pro Wireless 2200/2915 firmware (ibss), version 3.1
   (ipw2200-ibss.fw)
 * Intel Pro Wireless 2200/2915 firmware (snf), version 3.1
   (ipw2200-sniffer.fw)

firmware-libertas

* USB8388 'Thinfirm' firmware (lbtf_usb.bin)
 * CF8381 main code (libertas/cf8381.bin)
 * CF8381 boot code (libertas/cf8381_helper.bin)
 * CF8385 main code (libertas/cf8385.bin, libertas_cs.fw)
 * CF8385 boot code (libertas/cf8385_helper.bin, libertas_cs_helper.fw)
 * GSPI8686 main code, version 9.x (libertas/gspi8686_v9.bin,
   libertas/gspi8686.bin)
 * GSPI8686 boot code, version 9.x (libertas/gspi8686_v9_helper.bin,
   libertas/gspi8686_hlp.bin)
 * GSPI8688 main code (libertas/gspi8688.bin)
 * GSPI8688 boot code (libertas/gspi8688_helper.bin)
 * SD8385 main code (libertas/sd8385.bin, sd8385.bin)
 * SD8385 boot code (libertas/sd8385_helper.bin, sd8385_helper.bin)
 * SD8686 main code, version 8.x (libertas/sd8686_v8.bin, sd8686.bin)
 * SD8686 boot code, version 8.x (libertas/sd8686_v8_helper.bin,
   sd8686_helper.bin)
 * SD8686 main code, version 9.x (libertas/sd8686_v9.bin)
 * SD8686 boot code, version 9.x (libertas/sd8686_v9_helper.bin)
 * USB8388 OLPC firmware, version 5.110.22.p23
   (libertas/usb8388_olpc.bin)
 * USB8388 firmware, version 5.x (libertas/usb8388_v5.bin, usb8388.bin)
 * USB8388 firmware, version 9.x (libertas/usb8388_v9.bin)
 * USB8682 firmware (libertas/usb8682.bin)
 * PCIE8897 firmware, version 15.69.2.p11 (WLAN) / 15.28.2.p11 (BT)
   (mrvl/pcie8897_uapsta.bin)
 * SD8688 main code (mrvl/sd8688.bin, sd8688.bin, libertas/sd8688.bin)
 * SD8688 boot code (mrvl/sd8688_helper.bin, sd8688_helper.bin,
   libertas/sd8688_helper.bin)
 * SD8787 firmware, version 14.66.9.p96 (mrvl/sd8787_uapsta.bin)
 * SD8797 firmware, version 14.66.11.p151 (mrvl/sd8797_uapsta.bin)
 * SD8897 firmware, version 15.69.2.p11 (WLAN) / 15.28.2.p11 (BT)
   (mrvl/sd8897_uapsta.bin)
 * USB8797 firmware, version 14.69.11.p179 (mrvl/usb8797_uapsta.bin)
 * MWL8366 main code (mwl8k/fmimage_8366.fw)
 * MWL8366 AP-mode main code (mwl8k/fmimage_8366_ap-2.fw)
 * MWL8366 AP-mode main code, version 5.2.8.16
   (mwl8k/fmimage_8366_ap-3.fw)
 * MWL8687 main code (mwl8k/fmimage_8687.fw)
 * MWL8764 AP-mode firmware, version 7.4.0.9
   (mwl8k/fmimage_8764_ap-1.fw)
 * MWL8366 boot code (mwl8k/helper_8366.fw)
 * MWL8687 boot code (mwl8k/helper_8687.fw)

libertas-firmware

* Marvell Libertas 8xxx

zd1211-firmware

*  zd1211rw

Got this list here: https://linuxdicasesuporte.blogspot.com/2016/06/instalar-driver-wireless-no-debian.html

Was it already working before the change?

main contrib non-free
is already in my sources.list.
the Sierra Wireless 7355 (the old wwan card) worked flawlessly with modemmanager. i assumed the 7455 (the card i upgraded to) would be similar enough to use the same drivers and software.

i dont need a USB tether, my laptop has a wlan card i can use for internet until my wwan card gets working. problem is: my laptop is very rarely around reliable WiFi, it would be a much better solution to use LTE wwan.

i couldnt find any sierra firmware in debian’s repos. i guess the drivers for my old card are included with debian?

looking closely at my dmesg, it seems to me that this is due to a bug in my motherboard’s firmware.
does anybody know how one could go about fixing, or working around this?