Hello; I use NixOS on a Thinkpad with a USB-C docking station and two external screens. This works fine with 25.11 but going to 26.05, the screens are not detected and don’t work.
Any ideas why? Here is my configuration.nix. Where should I start looking? I don’t know what extra information to give here as I’ve found that saying too much in the OP means that people don’t read it.
Does rolling back to 25.11 make the displays work?
Yes.
========= ========
Could you share with us the result of running lsmod on the working version?
[mounty@ida:~]$ lsmod
Module Size Used by
ccm 20480 12
nls_utf8 12288 3
qrtr 57344 2
cifs 1970176 2
cifs_arc4 12288 1 cifs
nls_ucs2_utils 8192 1 cifs
cifs_md4 12288 1 cifs
dns_resolver 16384 1 cifs
netfs 581632 1 cifs
rfcomm 102400 4
snd_seq_dummy 12288 0
snd_hrtimer 12288 1
snd_seq 114688 7 snd_seq_dummy
af_packet 65536 6
sunrpc 897024 1
intel_uncore_frequency 12288 0
intel_uncore_frequency_common 16384 1 intel_uncore_frequency
intel_pmc_core_pltdrv 12288 0
intel_pmc_core 122880 0
intel_vsec 20480 1 intel_pmc_core
pmt_telemetry 16384 1 intel_pmc_core
pmt_class 16384 1 pmt_telemetry
snd_hda_codec_conexant 36864 1
snd_hda_codec_generic 114688 1 snd_hda_codec_conexant
joydev 28672 0
mousedev 24576 0
cmac 12288 4
algif_hash 12288 1
algif_skcipher 12288 1
af_alg 32768 6 algif_hash,algif_skcipher
bnep 28672 2
intel_tcc_cooling 12288 0
x86_pkg_temp_thermal 16384 0
r8153_ecm 12288 0
cdc_ether 24576 1 r8153_ecm
usbnet 65536 2 r8153_ecm,cdc_ether
snd_sof_pci_intel_cnl 20480 0
snd_sof_intel_hda_generic 45056 1 snd_sof_pci_intel_cnl
soundwire_intel 86016 1 snd_sof_intel_hda_generic
nls_iso8859_1 12288 1
soundwire_cadence 49152 1 soundwire_intel
nls_cp437 16384 1
rmi_smbus 16384 0
rmi_core 94208 1 rmi_smbus
snd_sof_intel_hda_common 204800 2 snd_sof_intel_hda_generic,snd_sof_pci_intel_cnl
vfat 28672 1
iwlmvm 667648 0
intel_powerclamp 20480 0
snd_soc_hdac_hda 28672 1 snd_sof_intel_hda_common
ofpart 16384 0
fat 110592 1 vfat
snd_sof_intel_hda_mlink 36864 3 soundwire_intel,snd_sof_intel_hda_common,snd_sof_intel_hda_generic
snd_sof_intel_hda 20480 2 snd_sof_intel_hda_common,snd_sof_intel_hda_generic
cmdlinepart 16384 0
coretemp 20480 0
crct10dif_pclmul 12288 1
crc32_pclmul 12288 0
r8152 167936 1 r8153_ecm
spi_nor 172032 0
snd_sof_pci 24576 2 snd_sof_intel_hda_generic,snd_sof_pci_intel_cnl
iTCO_wdt 16384 0
snd_sof_xtensa_dsp 16384 1 snd_sof_intel_hda_generic
polyval_clmulni 12288 0
think_lmi 36864 0
intel_pmc_bxt 16384 1 iTCO_wdt
mei_wdt 16384 0
polyval_generic 12288 1 polyval_clmulni
mii 16384 2 usbnet,r8152
ghash_clmulni_intel 16384 0
libphy 237568 1 r8152
apple_mfi_fastcharge 16384 0
hid_generic 12288 0
8250_dw 24576 0
intel_rapl_msr 20480 0
mei_hdcp 28672 0
mei_pxp 20480 0
firmware_attributes_class 12288 1 think_lmi
wmi_bmof 12288 0
mtd 110592 4 spi_nor,cmdlinepart,ofpart
watchdog 49152 2 iTCO_wdt,mei_wdt
intel_wmi_thunderbolt 16384 0
ee1004 16384 0
sha512_ssse3 53248 1
snd_ctl_led 28672 0
i915 4599808 50
mac80211 1654784 1 iwlmvm
snd_sof 487424 5 snd_sof_pci,snd_sof_intel_hda_common,snd_sof_intel_hda_generic,snd_sof_intel_hda,snd_sof_pci_intel_cnl
sha256_ssse3 36864 1
sha1_ssse3 32768 0
aesni_intel 122880 15
nouveau 3731456 16
gf128mul 16384 2 polyval_generic,aesni_intel
crypto_simd 16384 1 aesni_intel
cryptd 28672 5 crypto_simd,ghash_clmulni_intel
snd_sof_utils 16384 1 snd_sof
snd_soc_acpi_intel_match 126976 2 snd_sof_intel_hda_generic,snd_sof_pci_intel_cnl
rapl 20480 0
intel_cstate 20480 0
soundwire_generic_allocation 12288 1 soundwire_intel
snd_soc_acpi 16384 2 snd_soc_acpi_intel_match,snd_sof_intel_hda_generic
soundwire_bus 147456 3 soundwire_intel,soundwire_generic_allocation,soundwire_cadence
intel_uncore 270336 0
snd_soc_avs 241664 0
btusb 81920 0
btrtl 36864 1 btusb
btintel 69632 1 btusb
psmouse 229376 0
snd_soc_hda_codec 28672 1 snd_soc_avs
btbcm 24576 1 btusb
btmtk 36864 1 btusb
snd_hda_ext_core 36864 6 snd_soc_avs,snd_soc_hda_codec,snd_sof_intel_hda_common,snd_soc_hdac_hda,snd_sof_intel_hda_mlink,snd_sof_intel_hda
libarc4 12288 1 mac80211
bluetooth 1101824 34 btrtl,btmtk,btintel,btbcm,bnep,btusb,rfcomm
snd_usb_audio 573440 1
snd_soc_core 462848 6 snd_soc_avs,snd_soc_hda_codec,soundwire_intel,snd_sof,snd_sof_intel_hda_common,snd_soc_hdac_hda
uvcvideo 192512 2
iwlwifi 589824 1 iwlmvm
snd_hda_codec_hdmi 98304 1
snd_compress 32768 2 snd_soc_avs,snd_soc_core
videobuf2_vmalloc 20480 1 uvcvideo
ac97_bus 12288 1 snd_soc_core
uvc 12288 1 uvcvideo
mxm_wmi 12288 1 nouveau
thinkpad_acpi 196608 0
snd_usbmidi_lib 53248 1 snd_usb_audio
snd_pcm_dmaengine 16384 1 snd_soc_core
videobuf2_memops 16384 1 videobuf2_vmalloc
drm_gpuvm 45056 1 nouveau
videobuf2_v4l2 40960 1 uvcvideo
snd_ump 32768 1 snd_usb_audio
drm_exec 12288 2 drm_gpuvm,nouveau
snd_hda_intel 69632 2
usbhid 90112 0
gpu_sched 65536 1 nouveau
videobuf2_common 98304 4 videobuf2_vmalloc,videobuf2_v4l2,uvcvideo,videobuf2_memops
snd_rawmidi 57344 2 snd_usbmidi_lib,snd_ump
processor_thermal_device_pci_legacy 12288 0
mmc_block 69632 1
nvram 16384 1 thinkpad_acpi
snd_intel_dspcfg 40960 5 snd_soc_avs,snd_hda_intel,snd_sof,snd_sof_intel_hda_common,snd_sof_intel_hda_generic
processor_thermal_device 20480 1 processor_thermal_device_pci_legacy
platform_profile 12288 1 thinkpad_acpi
drm_buddy 28672 1 i915
drm_ttm_helper 16384 1 nouveau
snd_intel_sdw_acpi 16384 2 snd_intel_dspcfg,snd_sof_intel_hda_generic
processor_thermal_wt_hint 12288 1 processor_thermal_device
sparse_keymap 12288 1 thinkpad_acpi
videodev 397312 2 videobuf2_v4l2,uvcvideo
snd_hda_codec 221184 8 snd_hda_codec_generic,snd_hda_codec_conexant,snd_soc_avs,snd_hda_codec_hdmi,snd_soc_hda_codec,snd_hda_intel,snd_soc_hdac_hda,snd_sof_intel_hda
ttm 106496 3 drm_ttm_helper,i915,nouveau
cfg80211 1413120 3 iwlmvm,iwlwifi,mac80211
thunderbolt 585728 0
hid 270336 2 usbhid,hid_generic
rpmb_core 20480 1 mmc_block
snd_seq_device 16384 3 snd_seq,snd_ump,snd_rawmidi
ecdh_generic 16384 2 bluetooth
mc 90112 7 videodev,snd_usb_audio,videobuf2_v4l2,uvcvideo,videobuf2_common
ecc 49152 1 ecdh_generic
processor_thermal_rfim 24576 1 processor_thermal_device
rfkill 40960 10 iwlmvm,bluetooth,thinkpad_acpi,cfg80211
battery 28672 1 thinkpad_acpi
tpm_crb 28672 0
drm_display_helper 290816 2 i915,nouveau
ac 16384 0
processor_thermal_rapl 16384 1 processor_thermal_device
snd_hda_core 147456 11 snd_hda_codec_generic,snd_hda_codec_conexant,snd_soc_avs,snd_hda_codec_hdmi,snd_soc_hda_codec,snd_hda_intel,snd_hda_ext_core,snd_hda_codec,snd_sof_intel_hda_common,snd_soc_hdac_hda,snd_sof_intel_hda
int3403_thermal 16384 0
tiny_power_button 12288 0
snd_hwdep 20480 2 snd_usb_audio,snd_hda_codec
e1000e 380928 0
intel_rapl_common 53248 2 intel_rapl_msr,processor_thermal_rapl
ucsi_acpi 12288 0
typec_ucsi 77824 1 ucsi_acpi
intel_gtt 28672 1 i915
cec 81920 2 drm_display_helper,i915
snd_pcm 192512 13 snd_soc_avs,snd_hda_codec_hdmi,snd_hda_intel,snd_usb_audio,snd_hda_codec,soundwire_intel,snd_sof,snd_sof_intel_hda_common,snd_compress,snd_soc_core,snd_sof_utils,snd_hda_core,snd_pcm_dmaengine
processor_thermal_wt_req 12288 1 processor_thermal_device
intel_lpss_pci 28672 0
tpm_tis 16384 0
roles 16384 1 typec_ucsi
processor_thermal_power_floor 12288 1 processor_thermal_device
evdev 28672 25
rtc_cmos 28672 1
i2c_algo_bit 24576 2 i915,nouveau
video 81920 3 thinkpad_acpi,i915,nouveau
typec 118784 1 typec_ucsi
snd_timer 53248 3 snd_seq,snd_hrtimer,snd_pcm
tpm_tis_core 40960 1 tpm_tis
mei_me 57344 3
ptp 49152 2 iwlmvm,e1000e
int3400_thermal 24576 0
intel_lpss 12288 1 intel_lpss_pci
snd 155648 27 snd_ctl_led,snd_hda_codec_generic,snd_seq,snd_hda_codec_conexant,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_usb_audio,snd_usbmidi_lib,snd_hda_codec,snd_sof,snd_timer,snd_compress,thinkpad_acpi,snd_soc_core,snd_ump,snd_pcm,snd_rawmidi
i2c_i801 45056 0
processor_thermal_mbox 12288 4 processor_thermal_power_floor,processor_thermal_wt_req,processor_thermal_rfim,processor_thermal_wt_hint
thermal 28672 0
8250_pci 73728 0
acpi_thermal_rel 20480 1 int3400_thermal
pps_core 32768 1 ptp
mei 204800 7 mei_wdt,mei_hdcp,mei_pxp,mei_me
i2c_smbus 20480 1 i2c_i801
wmi 28672 6 video,intel_wmi_thunderbolt,wmi_bmof,think_lmi,mxm_wmi,nouveau
int340x_thermal_zone 16384 2 int3403_thermal,processor_thermal_device
soundcore 16384 2 snd_ctl_led,snd
i2c_mux 16384 1 i2c_i801
spi_intel_pci 12288 0
idma64 20480 0
pinctrl_cannonlake 36864 0
spi_intel 36864 1 spi_intel_pci
virt_dma 16384 1 idma64
intel_soc_dts_iosf 16384 1 processor_thermal_device_pci_legacy
acpi_pad 24576 0
intel_pch_thermal 20480 0
button 24576 1 nouveau
input_leds 12288 0
mac_hid 12288 0
serio_raw 20480 0
sch_fq_codel 20480 2
loop 45056 0
fuse 229376 5
configfs 69632 1
efi_pstore 12288 0
nfnetlink 20480 1
efivarfs 32768 1
tpm 122880 3 tpm_tis,tpm_crb,tpm_tis_core
rng_core 20480 1 tpm
dmi_sysfs 28672 0
autofs4 65536 1
ext4 1159168 1
crc32c_generic 12288 0
crc16 12288 2 bluetooth,ext4
mbcache 16384 1 ext4
jbd2 208896 1 ext4
sdhci_pci 106496 0
atkbd 40960 0
cqhci 40960 1 sdhci_pci
libps2 20480 2 atkbd,psmouse
vivaldi_fmap 12288 1 atkbd
sdhci 94208 1 sdhci_pci
nvme 69632 3
led_class 20480 8 snd_hda_codec_generic,videodev,sdhci,input_leds,libphy,iwlmvm,thinkpad_acpi,nouveau
i8042 57344 0
crc32c_intel 16384 2
xhci_pci 24576 0
nvme_core 253952 4 nvme
mmc_core 282624 4 sdhci,cqhci,mmc_block,sdhci_pci
serio 28672 8 rmi_core,serio_raw,atkbd,psmouse,i8042
xhci_hcd 397312 1 xhci_pci
nvme_auth 24576 1 nvme_core
evdi 126976 0
dm_mod 221184 0
dax 53248 1 dm_mod
[mounty@ida:~]$
When 26.05 is running, the screens are detected and shown in the GNOME displays settings, but they are blank.
I probably should have mentioned this earlier, but it might be useful running journalctl -k and journalctl -b 0 on 26.05 to see if there’s any relevant log entries.