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identity=mailfrom; envelope-from="miller@hamnavoe.com"; helo=balrog.mythic-beasts.com; client-ip=46.235.227.24 Received: from balrog.mythic-beasts.com (balrog.mythic-beasts.com [46.235.227.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by tb-mx0.topicbox.com (Postfix) with ESMTPS for <9fans@9fans.net>; Wed, 10 Mar 2021 11:53:07 -0500 (EST) (envelope-from miller@hamnavoe.com) Received: from [88.97.27.83] (port=34348 helo=hamnavoe.com) by balrog.mythic-beasts.com with esmtpsa (TLS1.0:RSA_AES_256_CBC_SHA1:256) (Exim 4.92.3) (envelope-from ) id 1lK251-0006V2-2W for 9fans@9fans.net; Wed, 10 Mar 2021 16:53:07 +0000 Message-ID: <6f360858720dfad854cde00093177473@hamnavoe.com> To: 9fans@9fans.net Subject: Re: [9fans] No signal on some monitors with Raspberry Pi 400 From: Richard Miller <9fans@hamnavoe.com> Date: Wed, 10 Mar 2021 16:53:01 +0000 In-Reply-To: <1615393465.438211175@apps.rackspace.com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-BlackCat-Spam-Score: 1 Topicbox-Policy-Reasoning: allow: sender is a member Topicbox-Message-UUID: 1a95ce92-81c1-11eb-a604-b8e9709fc429 Archived-At: =?UTF-8?B?PGh0dHBzOi8vOWZhbnMudG9waWNib3guY29tL2dyb3Vwcy85?= =?UTF-8?B?ZmFucy9UMjk1ODM1YzRjYWZiNmQ0Zi1NZDRmODE0ZTdjNDRmODZkOWY1ODRi?= =?UTF-8?B?NDAzPg==?= 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:Md4f814e7c44f86d9f584b403:1:rpvqheftPm0sJqIJ9LvrPgL3an_GZpXB9UUVIDg1AxI > That is, if I plug into a ~10 year old Vizio television > everything works fine at a reasonable resolution (1280x1024? I haven't y= et figured > out which utility to use to query display properties) Here's a simple way: term% echo `{dd -if /dev/screen -bs 64 -count 1} > , but if I plug it into a Dell > S2817Q the monitor says "No signal detected." 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.) 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 resoluti= on. Or add something like "vgasize=3D1600x1200x16" to the command line in cmdli= ne.txt - either method should work. ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/T295835c4cafb6d4f-Md4f81= 4e7c44f86d9f584b403 Delivery options: https://9fans.topicbox.com/groups/9fans/subscription