From nobody Thu Nov 27 05:31:34 2025 X-Original-To: freebsd-x11@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4dH4mW4PQZz6JSDX; Thu, 27 Nov 2025 05:31:39 +0000 (UTC) (envelope-from freebsd@walstatt-de.de) Received: from smtp052.goneo.de (smtp052.goneo.de [85.220.129.60]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4dH4mW25BTz3Z1Z; Thu, 27 Nov 2025 05:31:38 +0000 (UTC) (envelope-from freebsd@walstatt-de.de) Authentication-Results: mx1.freebsd.org; none Received: from hub2.goneo.de (hub2.goneo.de [IPv6:2001:1640:5::8:53]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by smtp5.goneo.de (Postfix) with ESMTPS id CC064240261; Thu, 27 Nov 2025 06:31:36 +0100 (CET) Received: from hub2.goneo.de (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by hub2.goneo.de (Postfix) with ESMTPS id 444002402A8; Thu, 27 Nov 2025 06:31:35 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=walstatt-de.de; s=DKIM001; t=1764221495; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=MyObN1ivisvD3/38R4rP9h5rqrPVAVHIUPPwOAvpYQ4=; b=CtEPRFbu/qEqdNuLXZqFkJ4XV6C8sE76yn6cGnJKRqkRMpd7T2rNwBncHubMTvU8EcDpXs Epruv2saxFcgmqL84czPQAP2xPB8NNvWbroQ1AfNuM+S6NWFWb0WSXizGXQINVCMGpQFDj J6nJPTDnwbv4gvKXyzQDj+MuaJImOB98Pqwaw+ksc6BmOxVWyd+3ORtNUsnqjgeN/gHz3+ k8ZPnIXBMQV2bErqja/deozQT4dcsTH00VnQyXbPi1p77Iz4pQ3ROSocTQWl2E4scabuxO Qf/W3Vy9VD5EUvHxO8VeJw4GnV8JktEGqA86B+0hwiX5r9o2KpLBzNfx0L0wrw== Received: from hermann (dynamic-2a02-3100-2eb7-8202-be6c-e0ee-39e6-fd11.310.pool.telefonica.de [IPv6:2a02:3100:2eb7:8202:be6c:e0ee:39e6:fd11]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by hub2.goneo.de (Postfix) with ESMTPSA id 07D1C240240; Thu, 27 Nov 2025 06:31:35 +0100 (CET) Date: Thu, 27 Nov 2025 06:31:34 +0100 From: FreeBSD User To: Lars Tunkrans 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> List-Id: X11 List-Archive: https://lists.freebsd.org/archives/freebsd-x11 List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: freebsd-x11@freebsd.org Sender: owner-freebsd-x11@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Rspamd-UID: 4c80ce X-Rspamd-UID: 342378 X-Spamd-Bar: ---- X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[] X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Rspamd-Queue-Id: 4dH4mW25BTz3Z1Z On Wed, 26 Nov 2025 22:31:20 +0100 Lars Tunkrans wrote: > HI >=20 > =C2=A0 =C2=A0Yes I=C2=A0 have=C2=A0 same experience. >=20 > =C2=A0 =C2=A0I beleive its because the=C2=A0 DDC/ EDID=C2=A0 =C2=A0info = sent from screen over=C2=A0=20 > the=C2=A0 connection cable > =C2=A0 =C2=A0is=C2=A0 lost=C2=A0 if=C2=A0 the=C2=A0 KVM=C2=A0 and screen= is not connected to the computer=20 > at start up. > =C2=A0 =C2=A0 If I make sure that=C2=A0 the screen is attached to=C2=A0 = the computer when=20 > the computer powers up > =C2=A0 =C2=A0 =C2=A0a=C2=A0 Usable resoultion/timing is selected by the = graphics card. >=20 > =C2=A0 Regards. Exactly. this behaviour is observed by myself on FreeBSD, Linux or Windows, on the c= ontrary, 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 o= ne is a Linux based commercial product provided by my employer leaves me with trouble whe= n powering up all machines. Kind regards, oh >=20 >=20 > 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 init= ialized 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 on= e host, > > switching to another host, working there and trying to switch back leav= es me with no > > output anymore! I see this behaviour with different types of KVM switch= es I have at > > hand. > > > > Can this behaviour be changed, even with no X11? > > > > Thanks in advance and wishes, > > > > O. Hartmann > > =20