From: bugzilla-daemon@kernel.org
To: linux-usb@vger.kernel.org
Subject: [Bug 220486] New: External monitor switches to lower refresh rate after resume from suspend
Date: Sat, 23 Aug 2025 18:55:51 +0000 [thread overview]
Message-ID: <bug-220486-208809@https.bugzilla.kernel.org/> (raw)
https://bugzilla.kernel.org/show_bug.cgi?id=220486
Bug ID: 220486
Summary: External monitor switches to lower refresh rate after
resume from suspend
Product: Drivers
Version: 2.5
Hardware: Intel
OS: Linux
Status: NEW
Severity: normal
Priority: P3
Component: USB
Assignee: drivers_usb@kernel-bugs.kernel.org
Reporter: bghome@gmail.com
Regression: No
Created attachment 308541
--> https://bugzilla.kernel.org/attachment.cgi?id=308541&action=edit
Kernel warning from drivers/usb/typec/class.c
An external monitor is connected to my laptop via USB-C port. Normally it works
in 3840x2160@30Hz mode. Sometimes after resuming from suspend, it falls back to
2048x1080@24Hz mode which is the highest available setting. This can be fixed
by re-plugging the USB-C cable or reboot.
At the same time I see a kernel warning raised by the USB driver (see attached
log).
Kernel version: LTS 6.12.41
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