NetBSD Problem Report #54026

From www@NetBSD.org  Thu Feb 28 21:04:03 2019
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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:

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