Re: [PATCH] thunderbolt: Defer DP tunnel teardown until display driver is ready

[An Wu]

Hi Mika
    We tried putting graphic modules into initramfs and the size
increased from 56 MB to over 200 MB. We will discuss with the team the
possibility of fixing this in userspace and follow up once we have a
clearer picture.
Really appreciate your time and patience.

BR
    An

On Mon, Jun 1, 2026 at 3:04 PM Mika Westerberg
<mika.westerberg@xxxxxxxxxxxxxxx> wrote:
>
> Hi,
>
> On Mon, Jun 01, 2026 at 02:50:21PM +0800, An Wu wrote:
> > Hi Mika
> >
> > Another approach I considered is using register_module_notifier() to
> > detect when a display driver module is loaded, then retrigger the DP
> > tunnel setup. However, since struct module does not carry any device
> > class or subsystem metadata, there is no generic way to identify
> > whether a loaded module is a display driver. We would need to maintain
> > a hardcoded list of known GPU module names (i915, xe, amdgpu, etc.),
> > which is fragile and not scalable.
>
> Indeed. Perhaps not to try to solve this in the kernel and instead do this
> in userspace?
>
> Have you actually measured how much initramfs size "increases" if you do
> include the relevant graphics drivers and their dependencies?