From: Richard Miller <9fans@hamnavoe.com>
To: 9fans@9fans.net
Subject: Re: [9fans] Forcing display size on Pi4
Date: Tue, 17 Dec 2019 21:31:47 +0000 [thread overview]
Message-ID: <ccf05f7fc6869e9af651de3e44505b6f@hamnavoe.com> (raw)
In-Reply-To: <f4e5442d5afb8586@orthanc.ca>
> I have a 2K display that Plan9 forces to 1920x1080 resolution.
> Poking around 9/bcm/screen.c indicates that setting vgasize=WxHxD
> should force the size, but adding a suitable entry in cmdline.txt
> just gives me a blank display.
>
> Before I dig deeper, is this expected to work?
Possibly not. I haven't tried vgasize= for years and there have been a
lot of changes to the firmware & videocore mailbox interface since then.
Plan 9 should accept whatever resolution comes from the gpu, so it
may be the firmware which "forces" 1920x1080. Maybe gpu_mem needs
to be bigger than the usual 16, or some other config.txt adjustment
is needed?
next prev parent reply other threads:[~2019-12-17 21:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-17 21:05 Lyndon Nerenberg
2019-12-17 21:31 ` Richard Miller [this message]
2019-12-17 23:18 ` [9fans] " Bakul Shah
2019-12-18 0:13 ` hiro
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