Re: WARNING: CPU: 0 PID: 32608 at drivers/gpu/drm/i915/display/intel_tc.c:1744 intel_tc_port_link_reset_work+0x398/0x3b0 [i915]

[Imre Deak <imre.deak@intel.com>]

Hi,

could you please open a ticket at

https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/new

and attach there a dmesg log booting with drm.debug=0x15e and
reproducing the problem?

Thanks,
Imre

On Mon, Aug 11, 2025 at 04:52:55PM +0200, Laurent Bigonville wrote:
> Hello,
> 
> On my Dell Latitude 5530 laptop, with an external screen connected using
> USB-C, from time to time, when coming back after both screens have been put
> in powersave mode, I've the following warning in dmesg:
> 
> > [12292.586347] ------------[ cut here ]------------
> > [12292.586359] i915 0000:00:02.0: [drm] drm_WARN_ON(ret)
> > [12292.586512] WARNING: CPU: 0 PID: 32608 at
> > drivers/gpu/drm/i915/display/intel_tc.c:1744
> > intel_tc_port_link_reset_work+0x398/0x3b0 [i915]
> > [12292.587044] Modules linked in: tun sd_mod scsi_mod scsi_common
> > hid_logitech_hidpp uhid snd_seq_dummy snd_hrtimer snd_seq snd_seq_device
> > xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT xt_tcpudp nft_compat
> > nf_nat_tftp nf_conntrack_tftp bridge stp llc ccm nf_conntrack_netbios_ns
> > nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib
> > nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct
> > nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4
> > nf_tables overlay rfcomm qrtr cmac algif_hash algif_skcipher af_alg bnep
> > sunrpc binfmt_misc snd_sof_pci_intel_tgl snd_sof_pci_intel_cnl
> > snd_sof_intel_hda_generic soundwire_intel soundwire_generic_allocation
> > snd_sof_intel_hda_sdw_bpt snd_sof_intel_hda_common snd_soc_hdac_hda
> > snd_sof_intel_hda_mlink snd_sof_intel_hda soundwire_cadence
> > snd_hda_codec_hdmi snd_sof_pci snd_sof_xtensa_dsp snd_sof snd_sof_utils
> > snd_soc_acpi_intel_match snd_soc_acpi_intel_sdca_quirks snd_soc_acpi
> > crc8 soundwire_bus snd_soc_sdca snd_soc_avs intel_uncore_frequency
> > [12292.587154]  snd_soc_hda_codec intel_uncore_frequency_common
> > snd_hda_codec_realtek snd_hda_ext_core x86_pkg_temp_thermal
> > snd_hda_codec_generic snd_soc_core intel_powerclamp
> > snd_hda_scodec_component snd_compress nls_ascii coretemp iwlmvm
> > snd_pcm_dmaengine nls_cp437 snd_hda_intel vfat kvm_intel
> > snd_intel_dspcfg fat uvcvideo snd_intel_sdw_acpi btusb mac80211
> > processor_thermal_device_pci videobuf2_vmalloc snd_hda_codec dell_pc
> > btrtl processor_thermal_device kvm processor_thermal_wt_hint snd_ctl_led
> > uvc platform_profile snd_hda_core btintel libarc4
> > platform_temperature_control videobuf2_memops processor_thermal_rfim
> > dell_rbtn intel_rapl_msr irqbypass snd_hwdep btbcm mei_pxp mei_hdcp
> > videobuf2_v4l2 dell_wmi processor_thermal_rapl dell_laptop iwlwifi
> > intel_rapl_common rapl btmtk snd_pcm videodev dell_smbios intel_pmc_core
> > processor_thermal_wt_req intel_cstate dell_wmi_sysman
> > processor_thermal_power_floor snd_timer dcdbas intel_uncore pcspkr
> > cfg80211 videobuf2_common bluetooth mei_me pmt_telemetry dell_wmi_ddv
> > dell_smm_hwmon
> > [12292.587262]  int3403_thermal processor_thermal_mbox snd
> > firmware_attributes_class dell_wmi_descriptor wmi_bmof ee1004 mc mei
> > pmt_class cdc_acm rfkill intel_hid igen6_edac int3400_thermal
> > int340x_thermal_zone soundcore acpi_pad acpi_tad
> > intel_pmc_ssram_telemetry acpi_thermal_rel sparse_keymap joydev ac evdev
> > msr i2c_dev parport_pc ppdev lp parport efi_pstore nfnetlink ip_tables
> > x_tables autofs4 ext4 crc16 mbcache jbd2 crc32c_cryptoapi dm_crypt
> > dm_mod raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor
> > async_tx xor raid6_pq raid1 raid0 md_mod typec_displayport
> > hid_plantronics usbhid xe intel_vsec drm_gpuvm configfs drm_gpusvm
> > gpu_sched drm_ttm_helper drm_exec drm_suballoc_helper hid_sensor_custom
> > hid_sensor_hub intel_ishtp_hid i915 drm_buddy ttm ucsi_acpi i2c_algo_bit
> > typec_ucsi hid_multitouch iTCO_wdt drm_display_helper typec hid_generic
> > intel_pmc_bxt cec roles ghash_clmulni_intel iTCO_vendor_support xhci_pci
> > rc_core i2c_hid_acpi nvme sha512_ssse3 rtsx_pci_sdmmc watchdog
> > intel_lpss_pci xhci_hcd
> > [12292.587396]  drm_client_lib i2c_hid nvme_core sha1_ssse3 psmouse
> > mmc_core i2c_i801 intel_lpss intel_ish_ipc drm_kms_helper usbcore hid
> > nvme_keyring aesni_intel serio_raw e1000e video rtsx_pci i2c_smbus
> > thunderbolt idma64 intel_ishtp nvme_auth drm usb_common button battery
> > wmi efivarfs
> > [12292.587445] CPU: 0 UID: 0 PID: 32608 Comm: kworker/u48:12 Tainted: G 
> >       W           6.16-amd64 #1 PREEMPT(lazy) Debian 6.16-1~exp1
> > [12292.587458] Tainted: [W]=WARN
> > [12292.587462] Hardware name: Dell Inc. Latitude 5530/0C6CYC, BIOS
> > 1.30.1 05/01/2025
> > [12292.587467] Workqueue: events_unbound intel_tc_port_link_reset_work
> > [i915]
> > [12292.587823] RIP: 0010:intel_tc_port_link_reset_work+0x398/0x3b0 [i915]
> > [12292.588156] Code: 48 8b 5f 50 48 85 db 75 03 48 8b 1f e8 01 2e 70 cf
> > 48 c7 c1 10 96 49 c1 48 89 da 48 c7 c7 cc 95 49 c1 48 89 c6 e8 c8 5d de
> > ce <0f> 0b e9 32 ff ff ff e8 1c 87 ac cf 66 66 2e 0f 1f 84 00 00 00 00
> > [12292.588160] RSP: 0018:ffffd2e70c2e3db8 EFLAGS: 00010282
> > [12292.588167] RAX: 0000000000000000 RBX: ffff8ab0826f74b0 RCX:
> > 0000000000000027
> > [12292.588171] RDX: ffff8ab7ef41ce08 RSI: 0000000000000001 RDI:
> > ffff8ab7ef41ce00
> > [12292.588173] RBP: ffff8ab081795c90 R08: 0000000000000000 R09:
> > 0000000000000000
> > [12292.588176] R10: 0000000000000000 R11: 0000000000000004 R12:
> > ffff8ab1b4e75800
> > [12292.588179] R13: ffffd2e70c2e3de0 R14: ffff8ab08c744628 R15:
> > 00000000ffffffea
> > [12292.588183] FS:  0000000000000000(0000) GS:ffff8ab85cdc8000(0000)
> > knlGS:0000000000000000
> > [12292.588187] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [12292.588190] CR2: 00007f54af377160 CR3: 000000059042c002 CR4:
> > 0000000000f72ef0
> > [12292.588195] PKRU: 55555554
> > [12292.588197] Call Trace:
> > [12292.588205]  <TASK>
> > [12292.588216]  process_one_work+0x18a/0x340
> > [12292.588227]  worker_thread+0x256/0x3a0
> > [12292.588233]  ? __pfx_worker_thread+0x10/0x10
> > [12292.588239]  kthread+0xf9/0x240
> > [12292.588247]  ? __pfx_kthread+0x10/0x10
> > [12292.588253]  ? __pfx_kthread+0x10/0x10
> > [12292.588260]  ret_from_fork+0x15c/0x190
> > [12292.588268]  ? __pfx_kthread+0x10/0x10
> > [12292.588275]  ret_from_fork_asm+0x1a/0x30
> > [12292.588285]  </TASK>
> > [12292.588287] ---[ end trace 0000000000000000 ]---
> 
> The port it's connected to is a Thunderbolt port, but the screen only uses
> USB-C
> 
> An idea what's happening?
> 
> libdrm: 2.4.124
> mesa: 25.0.7
> 
> Kind regards,
> 
> Laurent Bigonville
>