kld_list="drm" (was: i915kms kernel module causing freezes on FreeBSD 13.0-RELEASE)
grahamperrin at gmail.com
Sat May 8 11:52:57 UTC 2021
On 08/05/2021 07:10, Matt K wrote:
> On Sat, May 8, 2021 at 1:08 AM Graham Perrin <grahamperrin at gmail.com
> <mailto:grahamperrin at gmail.com>> wrote:
> Try a third approach:
> 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
(2018) "… toying with the possibility that … a specific load/start order
(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):
<https://pastebin.com/4XjNFaKk> line 17.
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