Date: Thu, 27 Nov 2025 06:31:34 +0100 From: FreeBSD User <freebsd@walstatt-de.de> To: Lars Tunkrans <drsnx60@gmail.com> Cc: freebsd-x11@freebsd.org, freebsd-current@freebsd.org Subject: Re: FreeBSD/X11: Howto revive DisplayPort? Message-ID: <20251127062631.5d8026c4@hermann> In-Reply-To: <77c2a2fb-ac5f-4b4a-98c6-660a39ee87b2@gmail.com> References: <20251126163059.3376d3e8@hermann> <77c2a2fb-ac5f-4b4a-98c6-660a39ee87b2@gmail.com>
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On Wed, 26 Nov 2025 22:31:20 +0100 Lars Tunkrans <drsnx60@gmail.com> wrote: > HI > > Yes I have same experience. > > I beleive its because the DDC/ EDID info sent from screen over > the connection cable > is lost if the KVM and screen is not connected to the computer > at start up. > If I make sure that the screen is attached to the computer when > the computer powers up > a Usable resoultion/timing is selected by the graphics card. > > Regards. Exactly. this behaviour is observed by myself on FreeBSD, Linux or Windows, on the contrary, seems to have a solution to reestablish a DP connection, so it might be possible on FreeBSD also (but is somehow by default disabled, I hope). Having for computer attached to one KVM, three of them are FBSD boxes and one is a Linux based commercial product provided by my employer leaves me with trouble when powering up all machines. Kind regards, oh > > > Den 2025-11-26 kl. 16:37, skrev FreeBSD User: > > Using FreeBSD CURREN and FreeBSD STABLE/15. > > Also, most systems are attached to a KVM switch, connected via DP. > > > > Hosts booting all UEFI. > > > > On hosts using X11/xdm GUI, switching forth and back to the output/host I want to use > > DP does obviously not "lose" DP output, so after graphics has been initialized I'm > > able to see the GUI. > > > > The situation is completely different with plain consoles, provided by FreeBSD's > > EFI/UEFI simple framebuffer device driver. Working on the console on one host, > > switching to another host, working there and trying to switch back leaves me with no > > output anymore! I see this behaviour with different types of KVM switches I have at > > hand. > > > > Can this behaviour be changed, even with no X11? > > > > Thanks in advance and wishes, > > > > O. Hartmann > >home | help
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