NetBSD Problem Report #54026
From www@NetBSD.org Thu Feb 28 21:04:03 2019
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for <gnats-bugs@gnats.NetBSD.org>; Thu, 28 Feb 2019 21:04:03 +0000 (UTC)
Message-Id: <20190228210402.D8F817A1EE@mollari.NetBSD.org>
Date: Thu, 28 Feb 2019 21:04:02 +0000 (UTC)
From: bsiegert@gmail.com
Reply-To: bsiegert@gmail.com
To: gnats-bugs@NetBSD.org
Subject: simplefb fails to sync with 4K monitor
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>Number: 54026
>Category: port-evbarm
>Synopsis: simplefb fails to sync with 4K monitor
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: port-evbarm-maintainer
>State: closed
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Thu Feb 28 21:05:00 +0000 2019
>Closed-Date: Sat Oct 29 14:18:12 +0000 2022
>Last-Modified: Sat Oct 29 14:18:12 +0000 2022
>Originator: Benny Siegert
>Release: NetBSD 8.99.34 (as of 2019-02-26)
>Organization:
The NetBSD Foundation
>Environment:
NetBSD arm64 8.99.34 NetBSD 8.99.34 (GENERIC) #0: Tue Feb 26 15:55:33 UTC 2019 mkrepro@mkrepro.NetBSD.org:/user/src/sys/arch/evbarm/compile/GENERIC64 evbarm
>Description:
I had this with two machines, an Orange Pi Plus 2E (32 bits) and a Pine A64-LTS (64 bits). The monitor is a Dell P2415Q (4K), connected via HDMI 1.4, so its preferred resolution is 3840x2160 at 30Hz.
During U-Boot (and NetBSD boot), the picture appears OK, but as soon as the NetBSD kernel takes over, the screen loses sync. The picture re-appears for less than a second, then a black screen again. After a while, the monitor displays an error ("current timing is unsupported") and switches off.
If you boot with "nomodeset" on the kernel command line, you get the desired resolution with no flicker.
>How-To-Repeat:
Boot NetBSD/evbarm on a 4K screen connected via HDMI.
>Fix:
?
>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->feedback
State-Changed-By: jmcneill@NetBSD.org
State-Changed-When: Sat, 14 May 2022 20:07:00 +0000
State-Changed-Why:
Please provide serial logs / dmesg from when the screen loses sync.
State-Changed-From-To: feedback->closed
State-Changed-By: jmcneill@NetBSD.org
State-Changed-When: Sat, 29 Oct 2022 14:18:12 +0000
State-Changed-Why:
Feedback timeout.
>Unformatted:
(Contact us)
$NetBSD: query-full-pr,v 1.47 2022/09/11 19:34:41 kim Exp $
$NetBSD: gnats_config.sh,v 1.9 2014/08/02 14:16:04 spz Exp $
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