linux-kernel - Re: [REGRESSION] tty lockup and WWAN loss after hibernate/suspend in 6.8+ on ThinkPad X1 Carbon Gen 10

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Message-ID: <CACTEcX4CBv9BTgvSrhJsFvPYLm_e5ms1PWzxsjv-hnudxiRTTw@mail.gmail.com>
Date: Tue, 19 Aug 2025 16:45:11 +0300
From: Andy Mindful <andy.mindful@...il.com>
To: regressions@...ts.linux.dev
Cc: linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, 
	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, 
	linux-acpi@...r.kernel.org, rafael@...nel.org, ville.syrjala@...ux.intel.com, 
	tglx@...utronix.de, Christian Brauner <brauner@...nel.org>, 
	Jani Nikula <jani.nikula@...el.com>, Paolo Bonzini <pbonzini@...hat.com>, regressions@...mhuis.info
Subject: Re: [REGRESSION] tty lockup and WWAN loss after hibernate/suspend in
 6.8+ on ThinkPad X1 Carbon Gen 10

Hello,

I've tried to bisect this again on a branch 'linux-6.8.y' @ linux-stable.

I made a commit log via: git log --oneline > commits-linux-6.8.y.txt
And started manually searching bad and good commits, this is the log:
3a2bd2b150f4 - bad
35a4474b5c3d - bad
dc97f6344f20 - bad
b85ea95d0864 - bad
ffc253263a13 - good

Once I have good, I switched back to: git checkout linux-6.8.y and
started bisecting,
which lead to below log:

git bisect start
# status: waiting for both good and bad commits
# bad: [3a2bd2b150f45844d99267696256716e4f23bf53] printk: Use
prb_first_seq() as base for 32bit seq macros
git bisect bad 3a2bd2b150f45844d99267696256716e4f23bf53
# status: waiting for good commit(s), bad commit known
# bad: [35a4474b5c3dd4315f72bd53e87b97f128d9bb3d] Merge tag
'bcachefs-2024-01-21' of https://evilpiepirate.org/git/bcachefs
git bisect bad 35a4474b5c3dd4315f72bd53e87b97f128d9bb3d
# status: waiting for good commit(s), bad commit known
# bad: [dc97f6344f205b0dfa144e1b3e16d6dc05383d57] cxl/pci: Register
for and process CPER events
git bisect bad dc97f6344f205b0dfa144e1b3e16d6dc05383d57
# status: waiting for good commit(s), bad commit known
# bad: [b85ea95d086471afb4ad062012a4d73cd328fa86] Linux 6.7-rc1
git bisect bad b85ea95d086471afb4ad062012a4d73cd328fa86
# status: waiting for good commit(s), bad commit known
# good: [ffc253263a1375a65fa6c9f62a893e9767fbebfa] Linux 6.6
git bisect good ffc253263a1375a65fa6c9f62a893e9767fbebfa
# good: [7d461b291e65938f15f56fe58da2303b07578a76] Merge tag
'drm-next-2023-10-31-1' of git://anongit.freedesktop.org/drm/drm
git bisect good 7d461b291e65938f15f56fe58da2303b07578a76
# good: [2a80532c0745e140852e6b579bbe8371332bb45d] Merge tag
'printk-for-6.7' of
git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux
git bisect good 2a80532c0745e140852e6b579bbe8371332bb45d
# good: [2a80532c0745e140852e6b579bbe8371332bb45d] Merge tag
'printk-for-6.7' of
git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux
git bisect good 2a80532c0745e140852e6b579bbe8371332bb45d
# bad: [e70703890b2586bc3567365d391c260d23fb7a94] Merge tag
'topic/nvidia-gsp-2023-11-03' of git://anongit.freedesktop.org/drm/drm
git bisect bad e70703890b2586bc3567365d391c260d23fb7a94
# good: [b06f58ad8e8c4154bc88d83b4fd70f74ede50193] Merge tag
'driver-core-6.7-rc1' of
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
git bisect good b06f58ad8e8c4154bc88d83b4fd70f74ede50193
# good: [1f24458a1071f006e3f7449c08ae0f12af493923] Merge tag
'tty-6.7-rc1' of
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
git bisect good 1f24458a1071f006e3f7449c08ae0f12af493923
# bad: [bfafa2c19d706ab1db0b581f9d3886469fab8627] Merge tag
'phy-for-6.7' of
git://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy
git bisect bad bfafa2c19d706ab1db0b581f9d3886469fab8627
# bad: [9b6db9a3a675fc2f33b587a9909dcef20c4b3794] Merge tag
'thunderbolt-for-v6.7-rc1' of
git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt into
usb-next
git bisect bad 9b6db9a3a675fc2f33b587a9909dcef20c4b3794
# good: [efa33cd89c8acc510ed0e4dbf98fc1cf3220b9dc] USB: typec:
tps6598x: Add status trace for tps25750
git bisect good efa33cd89c8acc510ed0e4dbf98fc1cf3220b9dc
# bad: [ff8e4630fa3c1f8775f162ceaf52ba8b656927de] usb: gadget:
lpc32xx-udc: Convert to use module_platform_driver()
git bisect bad ff8e4630fa3c1f8775f162ceaf52ba8b656927de
# bad: [c087fada0a6180ab5b88b11c1776eef02f8d556f] xhci: Clean up stale
comment on ERST_SIZE macro
git bisect bad c087fada0a6180ab5b88b11c1776eef02f8d556f
# bad: [5220d8b04a840fa09434072c866d032b163419e3] dt-bindings: usb:
gpio-sbu-mux: Make 'mode-switch' not required
git bisect bad 5220d8b04a840fa09434072c866d032b163419e3
# bad: [1034cc423f1b4a7a9a56d310ca980fcd2753e11d] gpio: update Intel
LJCA USB GPIO driver
git bisect bad 1034cc423f1b4a7a9a56d310ca980fcd2753e11d
# bad: [bfd3824c88081f9b2101d68376f14779ce26691f] i2c: Add support for
Intel LJCA USB I2C driver
git bisect bad bfd3824c88081f9b2101d68376f14779ce26691f
# good: [acd6199f195d6de814ac4090ce0864a613b1580e] usb: Add support
for Intel LJCA device
git bisect good acd6199f195d6de814ac4090ce0864a613b1580e
# first bad commit: [bfd3824c88081f9b2101d68376f14779ce26691f] i2c:
Add support for Intel LJCA USB I2C driver

Can you please advise, if it makes sense and results are accurate?

Best regards!
Andriy