[regression][amdgpu] analog output stops working on R9 380/Tonga Pro after upgrading to Ubuntu 18.04
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Triaged
|
High
|
Unassigned | ||
Bionic |
Triaged
|
High
|
Unassigned | ||
Cosmic |
Won't Fix
|
High
|
Unassigned |
Bug Description
After upgrading to Ubuntu 18.04 (and thus from Linux 4.13 to Linux 4.15) the Monitor connected via VGA (through DVI-I) shows a 'No Signal' message after amdgpu takes over from efifb and turns off.
The monitor worked fine in Ubuntu 17.10 and Linux 4.13.
When looking at the output of xrandr, the analog monitor is now detected as DVI-D instead of DVI-I and thus probably won't receive an analog signal anymore.
After some investigation, it turns out the monitor will light up when adding the `amdgpu.dc=0` kernel parameter.
I've tried Linux 4.18-rc6 from the mainline ppa and the issue persists unless I add the kernel parameter to disable DC.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-generic 4.15.0.29.31
ProcVersionSign
Uname: Linux 4.15.0-29-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/pcmC0D0p: benpicco 2151 F...m pulseaudio
/dev/snd/
/dev/snd/
CurrentDesktop: MATE
Date: Sat Jul 28 17:55:35 2018
EcryptfsInUse: Yes
HibernationDevice: RESUME=
InstallationDate: Installed on 2016-08-06 (720 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
IwConfig:
lo no wireless extensions.
eno1 no wireless extensions.
MachineType: System manufacturer System Product Name
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.173.1
RfKill:
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to bionic on 2018-07-28 (0 days ago)
dmi.bios.date: 11/09/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3603
dmi.board.
dmi.board.name: P8Z68-V
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.
dmi.modalias: dmi:bvnAmerican
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.
dmi.sys.vendor: System manufacturer
summary: |
- [regression][amdgpu] analog outputs stop working after upgrading to - Ubuntu 18.04 + [regression][amdgpu] analog output stops working on R9 380/Tonga Pro + after upgrading to Ubuntu 18.04 |
tags: | added: cscc |
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