https://bugs.freedesktop.org/show_bug.cgi?id=106846
Bug ID: 106846
Summary: RX480 with multiple HDMI ports shows monitor connected
to unused port when using amdgpu.dc=1
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: t...@timcarr.me
Created attachment 140060
--> https://bugs.freedesktop.org/attachment.cgi?id=140060&action=edit
'xrandr -q' output with and without amdgpu.dc enabled.
Card is an ASUS DUAL-RX480-04G. When booting with amdgpu.dc=1, as is default on
4.17+, the system shows a monitor on both HDMI ports when only one is
connected. This causes a low-resolution login screen and requires disabling the
non-existent monitor to prevent some windows from being opened off screen.
Attached is the 'xrandr -q' output from booting with and without amdgpu.dc
enabled. Behavior is the same regardless of which HDMI port is used.
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