Public bug reported:
System freezes completely shortly after login. A deadlock occurs between the
nvidia-modeset kernel thread and the KMS thread. Requires hard reboot to
recover.
Hardware: Lenovo 83JM (BIOS PZCN49WW 2025-06-06)
GPU: NVIDIA GeForce RTX 5050 laptop (hybrid GPU with Intel i915)
Driver: nvidia 595.71.05 (Open Kernel Module)
Kernel: 7.0.0-27-generic (Ubuntu 26.04)
--- Kernel log (Jul 02 ~03:58) ---
INFO: task KMS thread:5195 blocked for more than 122 seconds.
task:KMS thread state:D pid:5195
nvkms_ioctl_from_kapi_try_pmlock+0x55/0xd0 [nvidia_modeset]
ApplyModeSetConfig+0x357/0xba0 [nvidia_modeset]
nv_drm_atomic_apply_modeset_config+0x80b/0x9c0 [nvidia_drm]
drm_atomic_commit+0x6c/0xf0
nv_drm_ioctl+0x38/0x3f0 [nvidia_drm]
INFO: task KMS thread:5195 blocked on a semaphore likely last held by task
nvidia-modeset/:511
task:nvidia-modeset/ state:R (running but stuck) pid:511
RIP: nvWriteGpEntry+0xa4/0x370 [nvidia_modeset]
nvPushKickoff+0x28/0x50 [nvidia_modeset]
PrefetchHelperSurfaceEvo+0x45c/0x650 [nvidia_modeset]
nvDIFRPrefetchSurfaces+0x135/0x1f0 [nvidia_modeset]
DifrPrefetchEventDeferredWork+0x16/0x30 [nvidia_modeset]
nvkms_kthread_q_callback+0xe9/0x1a0 [nvidia_modeset]
(Repeated every ~2 min for 20+ minutes, from 122s to 1228s blocked)
--- Additional errors at driver load ---
NVRM: NV_ERR_INVALID_DATA from SBIOS for platform power mode and target
temperature
nvidia_init_module: "Unpatched return thunk in use" (kernel taint OE)
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2158978
Title:
System freeze on startup: nvidia-modeset/DifrPrefetchEventDeferredWork
deadlock with KMS thread (driver 595.71.05, kernel 7.0.0-27)
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