linux-kernel - Re: [PATCH] [RFC] thunderbolt: Add delay for Dell U2725QE link width

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Message-ID: <20260105111935.GM2275908@black.igk.intel.com>
Date: Mon, 5 Jan 2026 12:19:35 +0100
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: "Chia-Lin Kao (AceLan)" <acelan.kao@...onical.com>,
	Mario Limonciello <mario.limonciello@....com>,
	Andreas Noever <andreas.noever@...il.com>,
	Mika Westerberg <westeri@...nel.org>,
	Yehezkel Bernat <YehezkelShB@...il.com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, Sanath.S@....com,
	"Lin, Wayne" <Wayne.Lin@....com>
Subject: Re: [PATCH] [RFC] thunderbolt: Add delay for Dell U2725QE link width

On Fri, Jan 02, 2026 at 10:03:12AM +0800, Chia-Lin Kao (AceLan) wrote:
> > You only have one of those monitors? It would be good to check with another
> > if it has the same issue. I have GR reference device here which is what
> > this monitor is based on but I don't see any unplugs or link issues. I will
> > ask around if we have somewhere this monitor.
>
> Here is another BenQ 5k thunderbolt 4 monitor, and I can't reproduce
> the issue with this monitor, even with the AMD machine.
> 
> https://people.canonical.com/~acelan/bugs/tbt_call_trace/intel/merged_6.18.0-d358e5254674+.benq.out

Okay thanks! We have one Dell GR based monitor here (not the same as yours)
and a Lenovo GR based one. I asked the folks to try to repro the issue and
will share the results once I get them.