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Your message dated Sat, 21 Feb 2026 16:38:50 +0100
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and subject line Re: Bug#1128567: linux-image-6.18.5+deb13-amd64: amdgpu.dc=0
causes Xorg 1:7.7+24 error "no screens found"
has caused the Debian Bug report #1128567,
regarding linux-image-6.18.5+deb13-amd64: amdgpu.dc=0 causes Xorg 1:7.7+24
error "no screens found"
to be marked as done.
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Bug report if necessary, and/or fix the problem forthwith.
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--
1128567: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1128567
Debian Bug Tracking System
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From: JohnDoeThe3rd
To: Debian Bug Tracking System
Subject: linux-image-6.18.5+deb13-amd64: amdgpu.dc=0 causes Xorg 1:7.7+24
error "no screens found"
Message-ID: <177166731619.1953.9826469988028054583.reportbug@x7>
X-Mailer: reportbug 13.2.0
Date: Sat, 21 Feb 2026 10:48:36 +0100
Delivered-To: submit@bugs.debian.org
Package: src:linux
Version: 6.18.5-1~bpo13+1
Severity: important
X-Debbugs-Cc: mk939@ymail.com
Greetings.
When the Kernel command-line parameter 'amdgpu.dc=0' is used, the screen
resolution
(and TTY font) does not change on boot (i.e. stays whatever was used in GRUB).
The boot messages stop updating and a few seconds after, the screen turns off.
Excerpt from 'journalctl --boot=PREVIOUS_BOOT_HASH':
---
Feb 21 08:54:18 x7 systemd[1]: lightdm.service: Main process exited,
code=exited, status=1/FAILURE
Feb 21 08:54:18 x7 systemd[1]: lightdm.service: Failed with result 'exit-code'.
Feb 21 08:54:18 x7 systemd[1]: lightdm.service: Triggering OnFailure=
dependencies.
---
Exerpt from '/var/log/Xorg.0.log.old'
---
[ 13.170] (II) AMDGPU(0): glamor X acceleration enabled on AMD Radeon RX
570 Series (radeonsi, polaris10, ACO, DRM 3.64, 6.18.5+deb13-amd64)
[ 13.170] (II) AMDGPU(0): glamor detected, initialising EGL layer.
[ 13.170] (==) AMDGPU(0): TearFree property default: auto
[ 13.170] (==) AMDGPU(0): VariableRefresh: disabled
[ 13.170] (==) AMDGPU(0): AsyncFlipSecondaries: disabled
[ 13.170] (II) AMDGPU(0): KMS Pageflipping: enabled
[ 13.170] (WW) AMDGPU(0): No outputs definitely connected, trying again...
[ 13.170] (WW) AMDGPU(0): Unable to find connected outputs - setting
1024x768 initial framebuffer
[ 13.170] (II) AMDGPU(0): mem size init: gart size :1f0bb8000 vram size:
s:fefd0000 visible:fad0000
[ 13.170] (==) AMDGPU(0): DPI set to (96, 96)
[ 13.170] (==) AMDGPU(0): Using gamma correction (1.0, 1.0, 1.0)
[ 13.170] (II) Loading sub module "ramdac"
[ 13.170] (II) LoadModule: "ramdac"
[ 13.170] (II) Module "ramdac" already built-in
[ 13.170] (EE) AMDGPU(0): No modes.
[ 13.171] (II) UnloadModule: "amdgpu"
[ 13.171] (II) UnloadSubModule: "glamoregl"
[ 13.171] (II) Unloading glamoregl
[ 13.171] (EE) Screen(s) found, but none have a usable configuration.
[ 13.171] (EE)
Fatal server error:
[ 13.171] (EE) no screens found(EE)
[ 13.171] (EE)
---
Full log: https://paste.debian.net/hidden/6f585df9 (expires: 2026-05-22
09:39:21 UTC+0)
Manual bisect results:
- 6.12.63+deb13-amd64 --> GOOD
- 6.16.7+deb14-amd64 --> GOOD
- 6.17.13+deb13-amd64 --> GOOD
- 6.18.5+deb13-amd64 --> BAD
Removing the paramameter 'amdgpu.dc=0' does bring back Xorg to a working state.
However, this should not break Xorg at all. Currently I need this parameter
such that
adjusting the brightness is possible using the 'ddcutil' application.
-- Package-specific info:
** Kernel log: boot messages should be attached
** Model information
sys_vendor: Gigabyte Technology Co., Ltd.
product_name: Z87-HD3
product_version: To be filled by O.E.M.
chassis_vendor: Gigabyte Technology Co., Ltd.
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