From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f53.google.com ([209.85.221.53]) by ewsd; Thu Jan 16 21:46:46 EST 2020 Received: by mail-wr1-f53.google.com with SMTP id c14so21209666wrn.7 for <9front@9front.org>; Thu, 16 Jan 2020 18:46:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=9TCGxFf4z/lLY6BE63y5CDxzu7n/NbaN/Y/ZwMFqqbk=; b=Z1j52Z5/Vz6VodstjtZOFejyTDqszW+dz9zA50Bh41xetyIYYB90wptOHvfvEWX5O0 eQtJeYYvLzlxclhF2fSE5zM6k/zegGA7eQCz4IFRWzO5ScF+Vdp6Vap/Dv+GfrFP7Jbq AmBhcZxAh8UDiNO8IpticwyN7+HgmmeluX5HYjA7sSFUr73ZTvm6emeFDxhKyEdFEktt w1oHTXkLuOmUCZAO4/IlGWZa9qi3EsfhVxrZne96NAKy6WTN2cDOYQkPXci5MEKrgQx7 eHGoaRHUPoSS9Rvmd6P6dM1Yee/9/2eUrjnCtnB3eS/4iHznPkORCdoboSyMTp3+4u6L vgpQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=9TCGxFf4z/lLY6BE63y5CDxzu7n/NbaN/Y/ZwMFqqbk=; b=WbFl1AyLNultjLpxqHwYRui0p5OFdjU7zwloblO81nDvvx0pehQAoB+TaLR94vWbeY FfiaCx5npGnZ/Sqngwtmn99Q7B83LbYz7McLDvVPq7Rvq/Cj2gAC7OPDRUSx1h+No3RC J01sLqH+UvPPq3fRCkpWK2/LmuG3RwlU5WIRS0y4Tjon0WAnMssfl94G8JXC2SU/Mnzh DgG4y5GX32/SU50/9aei2VvEra9/5lXCoFj4TVQ8k48n7qYID838dOrl/f7W3h0aJFyq vTDk7omseNPUIwITUrXvWcTe2eVf3ung2/JIWM0rc65VH+yJfQNxOd/CD+1FJmaQVQPt aIuQ== X-Gm-Message-State: APjAAAWEW0nwNS6Yhs1FtHXTw5AoT8K1BywoGNpDhKl1nD7nfHO8k/Pe bxjCjyiKLnWcaXN2PthypZNl/o3FxjXHeQ9+ggwRbyHN X-Google-Smtp-Source: APXvYqzd3fnYzIqSAZtCBWNOJ7ebU0FY9EXf8K4/sKvxEnuHTiL9jkm++V5bqeJDMJg9BdqP8EAs9byaDdVwLLFEyiQ= X-Received: by 2002:adf:eb46:: with SMTP id u6mr496347wrn.239.1579229201987; Thu, 16 Jan 2020 18:46:41 -0800 (PST) MIME-Version: 1.0 Received: by 2002:a05:6000:108f:0:0:0:0 with HTTP; Thu, 16 Jan 2020 18:46:40 -0800 (PST) In-Reply-To: References: <2e360759-3707-4d66-a803-e79f36461181@email.android.com> From: hiro <23hiro@gmail.com> Date: Fri, 17 Jan 2020 02:46:40 +0000 Message-ID: Subject: Re: [9front] closeup photo of 4k pixel grid on tv To: 9front@9front.org Content-Type: text/plain; charset="UTF-8" List-ID: <9front.9front.org> List-Help: X-Glyph: ➈ X-Bullshit: extensible shared API cache API-based backend yeah, the one i got is definitely not TN, so it has good viewing angles. apart from price and resolution that was my only requirement. it's possible to get very good value nowadays. since it's a tv and so big, i'm sitting far away anyway, and the only thing i care that much about to be crisp is black on white text. so i would be good even if i sat quite near. in the meantime i got a little surprise accident shipment from amazon. instead of something else that i had ordered they got confused and sent me instead a usb-c adaptor to hdmi that is able to pass through 4k@59Hz from some laptop. lessons: 1) if 60hz doesn't work, but 59hz does, perhaps rpi hdmi output SNR was just a *little* too low and 5/6 bandwidth from the 50hz mode gets it to be just low enough to still work. next thing to try: increase rpi4 hdmi output signal power (there are some config.txt options) 2) it must be an *active* usb-c DP alternate mode->HDMI adaptor of some sort, bec. HDMI output bandwidth of the igpu is actually too low for 4k@59Hz (yes, intel still has this problem and they seem not to care or notice). DP would be high enough. i had tried really hard to find exactly such type of active adaptor on amazon and ebay, but it's impossible to find. most such adaptors are just forwarding hdmi signals directly from the gpu without conversion, and it's never specified in the technical data which strategy they use. e.g. i already had bought 2 adaptors and they don't do any conversion, so the igpu limits the hdmi output to 4k@30hz. this makes mouse movements so laggy as to be completely unusable. so i got very lucky amazon accidentally sent me what i needed anyway. funny, eh? i would recommend these cheap kinds of 4k TVs to anybody, if intel didn't fuck up their igpu's HDMI output bandwidth, or if it was possible to get the right adaptors easily. since neither is the case you are in for quite some experimentation unless you get a proper monitor (that isn't a PC) bec. they al come with less problematic DP input. On 1/16/20, Ethan Gardener wrote: > On Sun, Jan 5, 2020, at 4:30 PM, hiro wrote: >> >> it's not possible to turn this off, already tried all possible settings. > > That's a shame. I can set my 4k screen to "scenery" mode to see nice crisp > text, although I admit I haven't tried it with rpi/plan 9. "Text" mode is > awful, by the way, can barely see the characters. ;) It's an Asus, 28", > possibly the cheapest 4k they do. It's not great, colors change with viewing > angle, but I bought it for text. >