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Bug#1128567: linux-image-6.18.5+deb13-amd64: amdgpu.dc=0 causes Xorg 1:7.7+24 error "no screens found"

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On Sat, 2026-02-21 at 17:08 +0100, JohnDoeThe3rd wrote:
> My particular use-case is such that 'ddcutil' can issue commands over 
> the Display Data Channel (DDC), which does not work as 
> long CONFIG_DRM_AMD_DC is enabled.
> 
> Or do you mean that the 'amdgpu.dc' parameter deprecated? If not, then 
> it's a regression that should be fixed.

I can't speak for the amdgpu developers, but they seem to be already
very busy with bugs in the default driver configuration.  Since the
Display Core code has been around since 2017, I don't think it's
reasonable to expect that the old code path continues to be supported
for GPUs that Display Core supports.

It may be more productive to report the problem with ddcutil in Display
Core.

For what it's worth, ddcutil works for me with amdgpu and a monitor
connected via HDMI/DVI.  This computer has a slightly newer generation
of GPU than yours, though.

Ben.

-- 
Ben Hutchings
Who are all these weirdos? - David Bowie, on joining IRC

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Bug#1128567: linux-image-6.18.5+deb13-amd64: amdgpu.dc=0 causes Xorg 1:7.7+24 error "no screens found" JohnDoeThe3rd <mk939@ymail.com> - 2026-02-21 11:00 +0100
  Bug#1128567: marked as done (linux-image-6.18.5+deb13-amd64:  amdgpu.dc=0 causes Xorg 1:7.7+24 error "no screens found") "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-02-21 16:50 +0100
  Bug#1128567: linux-image-6.18.5+deb13-amd64: amdgpu.dc=0 causes Xorg 1:7.7+24 error "no screens found" Ben Hutchings <ben@decadent.org.uk> - 2026-02-21 20:50 +0100

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