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Date:      Sat, 8 May 2021 12:52:52 +0100
From:      Graham Perrin <>
To:        Matt K <>
Subject:   kld_list="drm" (was: i915kms kernel module causing freezes on FreeBSD 13.0-RELEASE)
Message-ID:  <>
In-Reply-To: <>
References:  <> <> <> <>

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On 08/05/2021 07:10, Matt K wrote:

> On Sat, May 8, 2021 at 1:08 AM Graham Perrin < 
> <>> wrote:
>     Try a third approach:
>     kld_list="drm"
> This works. I will keep an eye on the system, logs, etc, and let you 
> know what I find. Now everything seems to be working as advertised. 
> With xf86-video-intel, even TearFree is working.
> Where is this behavior documented?

FreeBSD for Pretty Little Unicorns, 1st Edition.

> How did you know about this solution?

It came to me in a dream. Whispered by the ghost of Barbara Stanwyck, 
once the highest-paid woman in the United States and famed for movies 
such as 'Sorry, Wrong Number'. Lesser-known but no less valuable 
contributions to postmodern creative thinking include 'Sorry, Wrong 

> I think that this means that my problem is solved, but the question 
> remains: why does i915kms cause freezes when loaded from rc.conf and 
> works normally when loaded by hand? This is not handbook-documented 
> behavior. Nor is it consistent or transparent.

Maybe not Intel-specific.

I find kld_list="drm" less troublesome than kld_list="radeonkms" with 
Thames [Radeon HD 7550M/7570M/7650M] with SDDM. A recent probe: 

My voyage of discovery spanned around three years. Maybe longer. A few 

(2018) I found kld_list="/boot/modules/radeonkms.ko" troublesome with 
FreeBSD 12.0-ALPHA7

(2018) "… toying with the possibility that … a specific load/start order 
might help."

(2019) I found drm-legacy-kmod better than drm-current-kmod with 

(2020) kld_list="/boot/modules/drm.ko" worked for me, keyword:


Eventually I condensed the working peculiarity to kld_list="drm".

More accurately (in context – SDDM, KDE Plasma and so on): 
<>; line 17.

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