Your message dated Sat, 21 Feb 2026 16:38:50 +0100
with message-id <[email protected]>
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.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
(NB: If you are a system administrator and have no idea what this
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immediately.)
--
1128567: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1128567
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: src:linux
Version: 6.18.5-1~bpo13+1
Severity: important
X-Debbugs-Cc: [email protected]
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.
chassis_version: To Be Filled By O.E.M.
bios_vendor: American Megatrends Inc.
bios_version: F8
board_vendor: Gigabyte Technology Co., Ltd.
board_name: Z87-HD3
board_version: To be filled by O.E.M.
** Configuration for modprobe:
blacklist microcode
blacklist arkfb
blacklist aty128fb
blacklist atyfb
blacklist radeonfb
blacklist cirrusfb
blacklist cyber2000fb
blacklist kyrofb
blacklist matroxfb_base
blacklist mb862xxfb
blacklist neofb
blacklist pm2fb
blacklist pm3fb
blacklist s3fb
blacklist savagefb
blacklist sisfb
blacklist tdfxfb
blacklist tridentfb
blacklist vt8623fb
blacklist microcode
options snd_pcsp index=-2
options cx88_alsa index=-2
options snd_atiixp_modem index=-2
options snd_intel8x0m index=-2
options snd_via82xx_modem index=-2
options md_mod start_ro=1
options bonding max_bonds=0
options dummy numdummies=0
options ifb numifbs=0
** PCI devices:
00:16.0 Communication controller [0780]: Intel Corporation 8 Series/C220 Series
Chipset Family MEI Controller #1 [8086:8c3a] (rev 04)
Subsystem: Gigabyte Technology Co., Ltd Device [1458:1c3a]
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 37
IOMMU group: 3
Region 0: Memory at f7f1a000 (64-bit, non-prefetchable) [size=16]
Capabilities: <access denied>
Kernel driver in use: mei_me
Kernel modules: mei_me
00:1c.0 PCI bridge [0604]: Intel Corporation 8 Series/C220 Series Chipset
Family PCI Express Root Port #1 [8086:8c10] (rev d5) (prog-if 00 [Normal
decode])
Subsystem: Gigabyte Technology Co., Ltd Device [1458:5001]
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 26
IOMMU group: 6
Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
I/O behind bridge: [disabled] [16-bit]
Memory behind bridge: [disabled] [32-bit]
Prefetchable memory behind bridge: [disabled] [64-bit]
Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- <SERR- <PERR-
BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16+ MAbort- >Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities: <access denied>
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1c.2 PCI bridge [0604]: Intel Corporation 8 Series/C220 Series Chipset
Family PCI Express Root Port #3 [8086:8c14] (rev d5) (prog-if 00 [Normal
decode])
Subsystem: Gigabyte Technology Co., Ltd Device [1458:5001]
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin C routed to IRQ 27
IOMMU group: 7
Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
I/O behind bridge: d000-dfff [size=4K] [16-bit]
Memory behind bridge: f7d00000-f7dfffff [size=1M] [32-bit]
Prefetchable memory behind bridge: f0300000-f03fffff [size=1M] [32-bit]
Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- <SERR- <PERR-
BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16+ MAbort- >Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities: <access denied>
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1f.0 ISA bridge [0601]: Intel Corporation Z87 Express LPC Controller
[8086:8c44] (rev 05)
Subsystem: Gigabyte Technology Co., Ltd Device [1458:5001]
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
IOMMU group: 10
Capabilities: <access denied>
Kernel driver in use: lpc_ich
Kernel modules: lpc_ich
00:1f.3 SMBus [0c05]: Intel Corporation 8 Series/C220 Series Chipset Family
SMBus Controller [8086:8c22] (rev 05)
Subsystem: Gigabyte Technology Co., Ltd Device [1458:5001]
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
Interrupt: pin C routed to IRQ 18
IOMMU group: 10
Region 0: Memory at f7f15000 (64-bit, non-prefetchable) [size=256]
Region 4: I/O ports at f000 [size=32]
Kernel driver in use: i801_smbus
Kernel modules: i2c_i801
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] [1002:67df] (rev
ef) (prog-if 00 [VGA controller])
Subsystem: ASUSTeK Computer Inc. Device [1043:04c2]
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 36
IOMMU group: 1
Region 0: Memory at e0000000 (64-bit, prefetchable) [size=256M]
Region 2: Memory at f0000000 (64-bit, prefetchable) [size=2M]
Region 4: I/O ports at e000 [size=256]
Region 5: Memory at f7e00000 (32-bit, non-prefetchable) [size=256K]
Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: amdgpu
Kernel modules: amdgpu
01:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere
HDMI Audio [Radeon RX 470/480 / 570/580/590] [1002:aaf0]
Subsystem: ASUSTeK Computer Inc. Device [1043:aaf0]
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin B routed to IRQ 38
IOMMU group: 1
Region 0: Memory at f7e60000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
** USB devices:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8000 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 002: ID 8087:8008 Intel Corp. Integrated Rate Matching Hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
-- System Information:
Debian Release: 13.3
APT prefers stable
APT policy: (500, 'stable'), (500, 'oldstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 6.18.5+deb13-amd64 (SMP w/4 CPU threads; PREEMPT)
Locale: LANG=de_CH.UTF-8, LC_CTYPE=de_CH.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages linux-image-6.18.5+deb13-amd64 depends on:
ii initramfs-tools [linux-initramfs-tool] 0.148.3
ii kmod 34.2-2
ii linux-base 4.12
ii linux-base-6.18.5+deb13-amd64 6.18.5-1~bpo13+1
Versions of packages linux-image-6.18.5+deb13-amd64 recommends:
ii apparmor 4.1.0-1
Versions of packages linux-image-6.18.5+deb13-amd64 suggests:
pn debian-kernel-handbook <none>
ii firmware-linux-free 20241210-2
ii grub-efi-amd64 2.12-9
pn linux-doc-6.18 <none>
Versions of packages linux-image-6.18.5+deb13-amd64 is related to:
ii firmware-amd-graphics 20250410-2
ii firmware-atheros 20250410-2
ii firmware-bnx2 20250410-2
ii firmware-bnx2x 20250410-2
ii firmware-brcm80211 20250410-2
ii firmware-cavium 20250410-2
ii firmware-cirrus 20250410-2
ii firmware-intel-graphics 20250410-2
ii firmware-intel-misc 20250410-2
ii firmware-intel-sound 20250410-2
ii firmware-ipw2x00 20250410-2
ii firmware-ivtv 20250410-2
ii firmware-iwlwifi 20250410-2
ii firmware-libertas 20250410-2
ii firmware-marvell-prestera 20250410-2
ii firmware-mediatek 20250410-2
ii firmware-misc-nonfree 20250410-2
ii firmware-myricom 20250410-2
ii firmware-netronome 20250410-2
ii firmware-netxen 20250410-2
ii firmware-nvidia-graphics 20250410-2
pn firmware-qcom-soc <none>
ii firmware-qlogic 20250410-2
ii firmware-realtek 20250410-2
pn firmware-samsung <none>
ii firmware-siano 20250410-2
pn firmware-ti-connectivity <none>
pn xen-hypervisor <none>
-- no debconf information
--- End Message ---
--- Begin Message ---
On Sat, 2026-02-21 at 10:48 +0100, JohnDoeThe3rd wrote:
> Package: src:linux
> Version: 6.18.5-1~bpo13+1
> Severity: important
> X-Debbugs-Cc: [email protected]
>
>
> 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.
[...]
So don't use that parameter, then.
Ben.
--
Ben Hutchings
Who are all these weirdos? - David Bowie, on joining IRC
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--- End Message ---
