Date: Tue, 1 Dec 2020 18:32:23 +0100 From: Ali Abdallah <ali.abdallah@suse.com> To: myfreeweb <greg@unrelenting.technology> Cc: freebsd-current@freebsd.org, Hans Petter Selasky <hps@selasky.org>, Scott Long <scottl@FreeBSD.org> Subject: Re: Issues with USB-C external monitors Message-ID: <20201201173223.mwmrkogcjmtc4k2j@frix230> In-Reply-To: <BD186C8D-AF73-4182-BF89-89005854F618@unrelenting.technology> References: <20201201131430.ol7pzms24h743iwf@frix230> <342519ee-6f73-98be-29b1-cea7890ccb1e@selasky.org> <BD186C8D-AF73-4182-BF89-89005854F618@unrelenting.technology>
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On 01.12.2020 17:10, myfreeweb wrote:
> >> __snippet__
> >> res = drmModeGetResources(fd);
> >> for (int i = 0; i < res->count_connectors; ++i) {
> >> conn = drmModeGetConnector(fd, res->connectors[i]);
>
> Note: you can run graphics/drm_info instead of writing custom code.
Thanks for the tip.
> devd (really drm in the kernel) provides hotplug events (system DRM, type HOTPLUG).
> libudev-devd translates these to UD_ACTION_HOTPLUG.
> This works well with wlroots compositors at least.
>
> How xorg does this I have no idea, as I don't use xorg.
> If your xorg is built with DEVD instead of UDEV option, it shouldn't work, I don't recall anyone adding support for that there.
> With UDEV it might work?
On current, for now I'm using the standard xorg-server from pkg, built
with UDEV according to [1], so apparently that is not working either. At
least in my case.
Will dig futher into it.
>
> >There is missing code in the kernel to handle USB-C PCI express
> >attach/detach. CC'ing Scott Long.
>
> Seems like this is about regular DisplayPort over USB-C (the USB side almost always handled in firmware for this on non-embedded computers).
> I don't think I've ever seen a *monitor* connecting over PCIe to an existing GPU ;)
> (in this case card0, the onboard vega)
Yes, this is just the DisplayPort over USB-C from the onboard vega GPU.
[1] https://www.freshports.org/x11-servers/xorg-server/
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