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[107.215.223.229]) by smtp.gmail.com with ESMTPSA id y1sm13058505qki.9.2021.03.10.09.38.20 for <9fans@9fans.net> (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 10 Mar 2021 09:38:21 -0800 (PST) From: Bakul Shah Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.60.0.2.21\)) Subject: Re: [9fans] No signal on some monitors with Raspberry Pi 400 Date: Wed, 10 Mar 2021 09:38:19 -0800 References: <6f360858720dfad854cde00093177473@hamnavoe.com> To: 9fans <9fans@9fans.net> In-Reply-To: <6f360858720dfad854cde00093177473@hamnavoe.com> Message-Id: <989CF9DB-E3DA-49B0-BEBA-5544B869BBA7@iitbombay.org> X-Mailer: Apple Mail (2.3654.60.0.2.21) Topicbox-Policy-Reasoning: allow: sender is a member Topicbox-Message-UUID: 6c4c4d14-81c7-11eb-b657-8e9766779192 Archived-At: =?UTF-8?B?PGh0dHBzOi8vOWZhbnMudG9waWNib3guY29tL2dyb3Vwcy85?= =?UTF-8?B?ZmFucy9UMjk1ODM1YzRjYWZiNmQ0Zi1NODU1YjUwY2ZiNTIzNTVkZDlhOTA2?= =?UTF-8?B?YWUyPg==?= List-Help: List-Id: "9fans" <9fans.9fans.net> List-Post: List-Software: Topicbox v0 List-Subscribe: Precedence: list Reply-To: 9fans <9fans@9fans.net> List-Unsubscribe: , Topicbox-Delivery-ID: 2:9fans:437d30aa-c441-11e9-8a57-d036212d11b0:522be890-2105-11eb-b15e-8d699134e1fa:M855b50cfb52355dd9a906ae2:1:jmbMpcEAnjrPhKJi-imhyq99Gz3Ou_boQNQWGiB_u3k On Mar 10, 2021, at 8:53 AM, Richard Miller <9fans@hamnavoe.com> wrote: >> That is, if I plug into a ~10 year old Vizio television >> everything works fine at a reasonable resolution (1280x1024? I haven't = yet figured >> out which utility to use to query display properties) >=20 > Here's a simple way: >=20 > term% echo `{dd -if /dev/screen -bs 64 -count 1} >=20 >> , but if I plug it into a Dell >> S2817Q the monitor says "No signal detected." >=20 > That's a 4k monitor, I think. The native resolution is probably too big > to fit in the virtual area allowed for the kernel frame buffer. (Lack of > foresight - monitors were smaller when 9pi was first done.) >=20 > I'll see about fixing that soon. Meanwhile, you should be able to use > hdmi_group and hdmi_mode settings in config.txt to request a lower resolu= tion. > Or add something like "vgasize=3D1600x1200x16" to the command line in cmd= line.txt - > either method should work. Not sure how things are different in pi4+pi9 but I was able to get 4K@20Hz under plan9 back in 2014 on the original pi. Not sure I can find that SDcard now but the settings were based on what I gleaned from this thread:= =20 https://www.raspberrypi.org/forums/viewtopic.php?t=3D79330 ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/T295835c4cafb6d4f-M855b5= 0cfb52355dd9a906ae2 Delivery options: https://9fans.topicbox.com/groups/9fans/subscription