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([2a01:cb15:8545:7700:62cf:84ff:fe81:caec]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4790adc8bbbsm142768635e9.3.2025.11.27.23.35.55 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 27 Nov 2025 23:35:55 -0800 (PST) Message-ID: <950fe459-217b-4066-99d8-1fa3247d0d84@gmail.com> Date: Fri, 28 Nov 2025 08:35:54 +0100 List-Id: Discussions about the use of FreeBSD-current List-Archive: https://lists.freebsd.org/archives/freebsd-current List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-current@FreeBSD.org MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: FreeBSD/X11: Howto revive DisplayPort? To: freebsd-current@freebsd.org References: <20251126163059.3376d3e8@hermann> <77c2a2fb-ac5f-4b4a-98c6-660a39ee87b2@gmail.com> Content-Language: en-US From: Paul Floyd In-Reply-To: <77c2a2fb-ac5f-4b4a-98c6-660a39ee87b2@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spamd-Bar: - X-Spamd-Result: default: False [-1.01 / 15.00]; SUBJECT_ENDS_QUESTION(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_SPAM_SHORT(0.99)[0.987]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20230601]; MIME_GOOD(-0.10)[text/plain]; RCVD_TLS_LAST(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_FROM(0.00)[gmail.com]; FROM_HAS_DN(0.00)[]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; FREEMAIL_ENVFROM(0.00)[gmail.com]; TO_DN_NONE(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; PREVIOUSLY_DELIVERED(0.00)[freebsd-current@freebsd.org]; MID_RHS_MATCH_FROM(0.00)[]; MLMMJ_DEST(0.00)[freebsd-current@freebsd.org]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::336:from] X-Rspamd-Queue-Id: 4dHlTW2TpCz3rfV On 2025-11-26 22:31, Lars Tunkrans 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. > I don't think that this is limited to DP either. I use a ugreen 4port HDMI KVM for Mac mini/workstation/old workstation/R Pi. Sometimes if I boot a device and forget to switch the KVM to the correct port then I get a black screen and have to ssh to whatever to reboot it. A+ Paul