| 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 | tim@timcarr.me |
Created attachment 140060 [details]
'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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