Public bug reported:
(edited with Claude support)
After upgrading from Ubuntu 24.04 to 26.04, the system freezes at boot
with kernel 7.0.0-38-generic. The old kernel 6.8.0-146-generic works fine.
Hardware: ASUS VivoBook X513EQ, BIOS X513EQ.318 (05/09/2023)
CPU/GPU: i7-1165G7, Iris Xe [8086:9a49] + NVIDIA (driver 580.178.04)
Symptom: hard freeze (keyboard dead, no TTY) 2-3 seconds after the
login screen appears. Also freezes with systemd.unit=multi-user.target.
Tested on 7.0.0-38:
- nomodeset -> boots, stable
- NVIDIA blacklisted -> still freezes
- xe.force_probe=9a49 (i915.force_probe=!9a49) -> still freezes
- intel_iommu=off -> still freezes
- i915.enable_dc=0 -> still freezes
- i915.enable_psr=0 -> still freezes
- video=HDMI-A-1:d video=HDMI-A-2:d -> still freezes
The kernel log shows repeated warnings in intel_tc.c (Type-C PHY):
- tgl_tc_phy_init: drm_WARN_ON(val == 0xffffffff)
- "Port F/TC#3: timeout waiting for PHY ready"
- icl_tc_phy_connect: drm_WARN_ON(tc->mode == TC_PORT_LEGACY)
- get_pin_assignment: "Missing case (pin_assignment == 15)"
- __intel_tc_port_lock: drm_WARN_ON(tc->mode != TC_PORT_TBT_ALT &&
!tc_phy_is_owned(tc))
triggered from intel_hdmi_detect and i915_hpd_poll_init_work.
The log is cut off at the moment of the freeze.
Syslog of a failed 7.0 boot attached.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "syslog of failed boot with 7.0.0-38"
https://bugs.launchpad.net/bugs/2172032/+attachment/6011919/+files/syslog-1.txt
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https://bugs.launchpad.net/bugs/2172032
Title:
[regression] Tiger Lake i915: hard freeze at boot on 7.0.0-38 after
upgrade 24.04 -> 26.04 (6.8 works)
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