[Bug 106427] RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel lockup - bugzilla-daemon

From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 106427] RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel lockup
Date: Mon, 07 May 2018 11:13:35 +0000	[thread overview]
Message-ID: <bug-106427-502@http.bugs.freedesktop.org/> (raw)

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https://bugs.freedesktop.org/show_bug.cgi?id=106427

            Bug ID: 106427
           Summary: RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel
                    lockup
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: txtoxtox285@googlemail.com

Kernel: 4.16.7

My monitor’s native mode is (some variant of) 5120x2880 at 60Hz. When amdgpu is
loaded during startup, it picks up this mode from the monitor and switches to
it just fine.

However, when I start a minimal X (X.Org X server 1.19.5, amdgpu 1.3.0) without
/etc/X11/xorg.conf and just an xterm and no window manager, I can see the for a
fraction of a second the xterm window in the upper left corner of the screen
before the monitor turns black. It’s not turned off, the monitor’s power LED
shows that it’s on.

When I try to switch to another Linux console with Alt+Tab+F6, nothing happens;
the console is not switched (I can verify this because typing “echo -en '\a'”
doesn’t beep).

After ca. 1:30 min the console finally *is* switched but remains black. The
kernel spews out messages about timeouts, and I have to reboot the machine
(from ssh or Ctrl+Alt+Del).

I can use X with 5K if I restrict the refresh rate to 30 Hz (from “cvt 5120
2880 30”).

This bug is present since kernel 4.15.10 or thereabouts, which was the first
version where amdgpu would work with dc = 1.

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