I also have a comparison of kernel modules between the successful (left) 
and broken (right) lsmod output. Blindly loading all modules listed in 
the working instance did not help. Ideas ? Yours, Steffen

diff -y lsmod-sorted.txt lsmod-broken.txt 
8250_dw                16384  0                                 8250_dw         
       16384  0
ablk_helper            16384  1 aesni_intel                     ablk_helper     
       16384  1 aesni_intel
ac97_bus               16384  1 snd_soc_core                    ac97_bus        
       16384  1 snd_soc_core
acer_wmi               20480  0                                 acer_wmi        
       20480  0
aesni_intel           167936  0                                 aesni_intel     
      167936  0
aes_x86_64             20480  1 aesni_intel                     aes_x86_64      
       20480  1 aesni_intel
ahci                   36864  2                               | ahci            
       36864  3
arc4                   16384  2                                 arc4            
       16384  2
                                                              > aufs            
      217088  0
autofs4                40960  2                                 autofs4         
       40960  2
bluetooth             520192  29 bnep,btbcm,btrtl,btusb,rfcom | binfmt_misc     
       20480  1
                                                              > bluetooth       
      520192  39 bnep,btbcm,btrtl,btusb,rfcom
bnep                   20480  2                                 bnep            
       20480  2
                                                              > bridge          
      126976  1 br_netfilter
                                                              > br_netfilter    
       24576  0
btbcm                  16384  1 btusb                           btbcm           
       16384  1 btusb
btintel                16384  1 btusb                           btintel         
       16384  1 btusb
btrtl                  16384  1 btusb                           btrtl           
       16384  1 btusb
btusb                  45056  0                                 btusb           
       45056  0
cfg80211              565248  3 iwlwifi,mac80211,iwlmvm         cfg80211        
      565248  3 iwlwifi,mac80211,iwlmvm
coretemp               16384  0                                 coretemp        
       16384  0
crc32_pclmul           16384  0                                 crc32_pclmul    
       16384  0
crct10dif_pclmul       16384  0                                 
crct10dif_pclmul       16384  0
cryptd                 20480  2 aesni_intel,ablk_helper       | cryptd          
       20480  3 ghash_clmulni_intel,aesni_int
dell_smo8800           16384  0                                 dell_smo8800    
       16384  0
dm_log                 20480  2 dm_region_hash,dm_mirror      | drm             
      364544  5 i915,drm_kms_helper
dm_mirror              24576  0                               | drm_kms_helper  
      155648  1 i915
dm_region_hash         24576  1 dm_mirror                     <
drm                   360448  6 i915,drm_kms_helper           <
drm_kms_helper        147456  1 i915                          <
dw_dmac                16384  0                                 dw_dmac         
       16384  0
dw_dmac_core           24576  1 dw_dmac                         dw_dmac_core    
       24576  1 dw_dmac
e1000e                237568  0                                 e1000e          
      237568  0
elan_i2c               36864  0                                 elan_i2c        
       36864  0
fb_sys_fops            16384  1 drm_kms_helper                  fb_sys_fops     
       16384  1 drm_kms_helper
fjes                   28672  0                                 fjes            
       28672  0
gf128mul               16384  1 lrw                             gf128mul        
       16384  1 lrw
                                                              > 
ghash_clmulni_intel    16384  0
glue_helper            16384  1 aesni_intel                     glue_helper     
       16384  1 aesni_intel
hci                    45056  2 pn544,mei_phy                   hci             
       45056  2 pn544,mei_phy
hid                   118784  1 i2c_hid                         hid             
      118784  1 i2c_hid
i2c_algo_bit           16384  1 i915                            i2c_algo_bit    
       16384  1 i915
i2c_designware_core    20480  1 i2c_designware_platform         
i2c_designware_core    20480  1 i2c_designware_platform
i2c_designware_platform    16384  0                             
i2c_designware_platform    16384  0
i2c_hid                20480  0                                 i2c_hid         
       20480  0
i915                 1208320  5                               | i915            
     1208320  4
input_leds             16384  0                                 input_leds      
       16384  0
intel_powerclamp       16384  0                                 
intel_powerclamp       16384  0
intel_rapl             20480  0                                 intel_rapl      
       20480  0
intel_smartconnect     16384  0                                 
intel_smartconnect     16384  0
                                                              > ip6table_filter 
       16384  1
                                                              > ip6_tables      
       28672  1 ip6table_filter
                                                              > ip6t_REJECT     
       16384  3
                                                              > ip6t_rt         
       16384  3
                                                              > iptable_filter  
       16384  1
                                                              > iptable_nat     
       16384  1
                                                              > ip_tables       
       24576  2 iptable_filter,iptable_nat
                                                              > ipt_MASQUERADE  
       16384  1
                                                              > ipt_REJECT      
       16384  3
irqbypass              16384  1 kvm                             irqbypass       
       16384  1 kvm
isofs                  40960  1                               <
iwlmvm                311296  0                                 iwlmvm          
      311296  0
iwlwifi               200704  1 iwlmvm                          iwlwifi         
      200704  1 iwlmvm
joydev                 20480  0                                 joydev          
       20480  0
kvm                   536576  1 kvm_intel                     | kvm             
      544768  1 kvm_intel
kvm_intel             172032  0                                 kvm_intel       
      172032  0
libahci                32768  1 ahci                            libahci         
       32768  1 ahci
libcrc32c              16384  1 xfs                             libcrc32c       
       16384  1 xfs
                                                              > llc             
       16384  2 stp,bridge
lp                     20480  0                                 lp              
       20480  0
lpc_ich                24576  0                                 lpc_ich         
       24576  0
lrw                    16384  1 aesni_intel                     lrw             
       16384  1 aesni_intel
mac80211              737280  1 iwlmvm                          mac80211        
      737280  1 iwlmvm
mac_hid                16384  0                                 mac_hid         
       16384  0
media                  24576  2 uvcvideo,videodev               media           
       24576  2 uvcvideo,videodev
mei                    98304  4 pn544_mei,mei_phy,mei_me        mei             
       98304  4 pn544_mei,mei_phy,mei_me
mei_me                 36864  0                                 mei_me          
       36864  0
mei_phy                16384  1 pn544_mei                       mei_phy         
       16384  1 pn544_mei
memstick               20480  1 rtsx_pci_ms                     memstick        
       20480  1 rtsx_pci_ms
Module                  Size  Used by                           Module          
        Size  Used by
nfc                   102400  2 hci,pn544                       nfc             
      102400  2 hci,pn544
nls_iso8859_1          16384  0                               | nf_conntrack    
      106496  10 nf_nat_ftp,nf_conntrack_netb
nls_utf8               16384  1                               | 
nf_conntrack_broadcast    16384  1 nf_conntrack_netbios_ns
option                 53248  1                               | 
nf_conntrack_ftp       20480  1 nf_nat_ftp
overlay                49152  1                               | 
nf_conntrack_ipv4      16384  10
                                                              > 
nf_conntrack_ipv6      20480  8
                                                              > 
nf_conntrack_netbios_ns    16384  0
                                                              > nf_defrag_ipv4  
       16384  1 nf_conntrack_ipv4
                                                              > nf_defrag_ipv6  
       36864  1 nf_conntrack_ipv6
                                                              > nf_log_common   
       16384  2 nf_log_ipv4,nf_log_ipv6
                                                              > nf_log_ipv4     
       16384  5
                                                              > nf_log_ipv6     
       16384  5
                                                              > nf_nat          
       24576  3 nf_nat_ftp,nf_nat_ipv4,nf_nat
                                                              > nf_nat_ftp      
       16384  0
                                                              > nf_nat_ipv4     
       16384  1 iptable_nat
                                                              > 
nf_nat_masquerade_ipv4    16384  1 ipt_MASQUERADE
                                                              > nf_reject_ipv4  
       16384  1 ipt_REJECT
                                                              > nf_reject_ipv6  
       16384  1 ip6t_REJECT
                                                              > nls_iso8859_1   
       16384  1
parport                49152  3 lp,ppdev,parport_pc             parport         
       49152  3 lp,ppdev,parport_pc
parport_pc             32768  0                                 parport_pc      
       32768  0
                                                              > pci_stub        
       16384  1
pn544                  20480  1 pn544_mei                       pn544           
       20480  1 pn544_mei
pn544_mei              16384  0                                 pn544_mei       
       16384  0
ppdev                  20480  0                                 ppdev           
       20480  0
pps_core               20480  1 ptp                             pps_core        
       20480  1 ptp
psmouse               126976  0                               | psmouse         
      131072  0
ptp                    20480  1 e1000e                          ptp             
       20480  1 e1000e
rfcomm                 69632  2                               | rfcomm          
       69632  12
rtsx_pci               53248  2 rtsx_pci_ms,rtsx_pci_sdmmc      rtsx_pci        
       53248  2 rtsx_pci_ms,rtsx_pci_sdmmc
rtsx_pci_ms            20480  0                                 rtsx_pci_ms     
       20480  0
rtsx_pci_sdmmc         24576  0                                 rtsx_pci_sdmmc  
       24576  0
sdhci                  45056  1 sdhci_acpi                      sdhci           
       45056  1 sdhci_acpi
sdhci_acpi             16384  0                                 sdhci_acpi      
       16384  0
serio_raw              16384  0                                 serio_raw       
       16384  0
shpchp                 36864  0                                 shpchp          
       36864  0
snd                    81920  23 snd_hda_codec_realtek,snd_so   snd             
       81920  23 snd_hda_codec_realtek,snd_so
snd_compress           20480  1 snd_soc_core                    snd_compress    
       20480  1 snd_soc_core
snd_hda_codec         135168  4 snd_hda_codec_realtek,snd_hda   snd_hda_codec   
      135168  4 snd_hda_codec_realtek,snd_hda
snd_hda_codec_generic    77824  1 snd_hda_codec_realtek         
snd_hda_codec_generic    77824  1 snd_hda_codec_realtek
snd_hda_codec_hdmi     53248  1                                 
snd_hda_codec_hdmi     53248  1
snd_hda_codec_realtek    86016  1                               
snd_hda_codec_realtek    86016  1
snd_hda_core           73728  5 snd_hda_codec_realtek,snd_hda   snd_hda_core    
       73728  5 snd_hda_codec_realtek,snd_hda
snd_hda_intel          36864  5                               | snd_hda_intel   
       40960  5
snd_hwdep              16384  1 snd_hda_codec                   snd_hwdep       
       16384  1 snd_hda_codec
snd_pcm               106496  7 snd_soc_rt5640,snd_soc_core,s   snd_pcm         
      106496  7 snd_soc_rt5640,snd_soc_core,s
snd_pcm_dmaengine      16384  1 snd_soc_core                    
snd_pcm_dmaengine      16384  1 snd_soc_core
snd_rawmidi            32768  1 snd_seq_midi                    snd_rawmidi     
       32768  1 snd_seq_midi
snd_seq                69632  2 snd_seq_midi_event,snd_seq_mi   snd_seq         
       69632  2 snd_seq_midi_event,snd_seq_mi
snd_seq_device         16384  3 snd_seq,snd_rawmidi,snd_seq_m   snd_seq_device  
       16384  3 snd_seq,snd_rawmidi,snd_seq_m
snd_seq_midi           16384  0                                 snd_seq_midi    
       16384  0
snd_seq_midi_event     16384  1 snd_seq_midi                    
snd_seq_midi_event     16384  1 snd_seq_midi
snd_soc_core          212992  1 snd_soc_rt5640                  snd_soc_core    
      212992  1 snd_soc_rt5640
snd_soc_rl6231         16384  1 snd_soc_rt5640                  snd_soc_rl6231  
       16384  1 snd_soc_rt5640
snd_soc_rt5640        114688  0                                 snd_soc_rt5640  
      114688  0
snd_soc_sst_acpi       16384  0                                 
snd_soc_sst_acpi       16384  0
snd_timer              32768  2 snd_pcm,snd_seq                 snd_timer       
       32768  2 snd_pcm,snd_seq
soundcore              16384  1 snd                             soundcore       
       16384  1 snd
sparse_keymap          16384  1 acer_wmi                        sparse_keymap   
       16384  1 acer_wmi
spi_pxa2xx_platform    24576  0                                 
spi_pxa2xx_platform    24576  0
                                                              > stp             
       16384  1 bridge
syscopyarea            16384  1 drm_kms_helper                  syscopyarea     
       16384  1 drm_kms_helper
sysfillrect            16384  1 drm_kms_helper                  sysfillrect     
       16384  1 drm_kms_helper
sysimgblt              16384  1 drm_kms_helper                  sysimgblt       
       16384  1 drm_kms_helper
uas                    24576  0                               | usb_storage     
       69632  0
usbserial              53248  4 option,usb_wwan               <
usb_storage            69632  2 uas                           <
usb_wwan               20480  1 option                        <
uvcvideo               90112  0                                 uvcvideo        
       90112  0
v4l2_common            16384  1 videobuf2_v4l2                  v4l2_common     
       16384  1 videobuf2_v4l2
                                                              > vboxdrv         
      454656  3 vboxnetadp,vboxnetflt,vboxpci
                                                              > vboxnetadp      
       28672  0
                                                              > vboxnetflt      
       28672  0
                                                              > vboxpci         
       24576  0
video                  40960  2 i915,acer_wmi                   video           
       40960  2 i915,acer_wmi
videobuf2_core         36864  2 uvcvideo,videobuf2_v4l2         videobuf2_core  
       36864  2 uvcvideo,videobuf2_v4l2
videobuf2_memops       16384  1 videobuf2_vmalloc               
videobuf2_memops       16384  1 videobuf2_vmalloc
videobuf2_v4l2         28672  1 uvcvideo                        videobuf2_v4l2  
       28672  1 uvcvideo
videobuf2_vmalloc      16384  1 uvcvideo                        
videobuf2_vmalloc      16384  1 uvcvideo
videodev              176128  4 uvcvideo,v4l2_common,videobuf   videodev        
      176128  4 uvcvideo,v4l2_common,videobuf
wmi                    20480  1 acer_wmi                        wmi             
       20480  1 acer_wmi
x86_pkg_temp_thermal    16384  0                                
x86_pkg_temp_thermal    16384  0
xfs                   970752  1                               | xfrm_algo       
       16384  1 xfrm_user
                                                              > xfrm_user       
       32768  1
                                                              > xfs             
      970752  5
                                                              > x_tables        
       36864  14 ip6table_filter,xt_hl,ip_tab
                                                              > xt_addrtype     
       16384  6
                                                              > xt_conntrack    
       16384  17
                                                              > xt_hl           
       16384  22
                                                              > xt_limit        
       16384  13
                                                              > xt_LOG          
       16384  10
                                                              > xt_tcpudp       
       16384  20

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https://bugs.launchpad.net/bugs/1673250

Title:
  Internal HUAWEI Mobile Broadband Module not showing up as USB device

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