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Wed, 10 Mar 2021 10:48:18 -0800 (PST) MIME-Version: 1.0 Received: by 2002:a17:906:4486:0:0:0:0 with HTTP; Wed, 10 Mar 2021 10:48:18 -0800 (PST) In-Reply-To: <989CF9DB-E3DA-49B0-BEBA-5544B869BBA7@iitbombay.org> References: <6f360858720dfad854cde00093177473@hamnavoe.com> <989CF9DB-E3DA-49B0-BEBA-5544B869BBA7@iitbombay.org> From: hiro <23hiro@gmail.com> Date: Wed, 10 Mar 2021 19:48:18 +0100 Message-ID: Subject: Re: [9fans] No signal on some monitors with Raspberry Pi 400 To: 9fans <9fans@9fans.net> Content-Type: text/plain; charset="UTF-8" Topicbox-Policy-Reasoning: allow: sender is a member Topicbox-Message-UUID: 317edf44-81d1-11eb-b5c9-ca0862a339c8 Archived-At: =?UTF-8?B?PGh0dHBzOi8vOWZhbnMudG9waWNib3guY29tL2dyb3Vwcy85?= =?UTF-8?B?ZmFucy9UMjk1ODM1YzRjYWZiNmQ0Zi1NNTQ0NGY3YzQ2YTVmMDdkMzkyYzRh?= =?UTF-8?B?MDhjPg==?= List-Help: List-Id: "9fans" <9fans.9fans.net> List-Post: List-Software: Topicbox v0 List-Subscribe: Precedence: list Reply-To: 9fans <9fans@9fans.net> Content-Transfer-Encoding: quoted-printable List-Unsubscribe: , Topicbox-Delivery-ID: 2:9fans:437d30aa-c441-11e9-8a57-d036212d11b0:522be890-2105-11eb-b15e-8d699134e1fa:M5444f7c46a5f07d392c4a08c:1:SMZgg5BqgmT8E0rVEeSf6rZa6i7NlLMyv5HdtQwFPe4 i even get 4k@60hz here on a rpi4 on 9front, but there was a lot of interference with bluetooth, wifi and usb3, it might be you need an extra strong signal, did you try with a short cable that has a high bandwidth? On 3/10/21, Bakul Shah wrote: > 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) >> >> 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 >> resolution. >> Or add something like "vgasize=3D1600x1200x16" to the command line in >> cmdline.txt - >> either method should work. >=20 > 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: > https://www.raspberrypi.org/forums/viewtopic.php?t=3D79330 ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/T295835c4cafb6d4f-M5444f= 7c46a5f07d392c4a08c Delivery options: https://9fans.topicbox.com/groups/9fans/subscription