Public bug reported:
I have a rather strange setup, with an nvidia and AMD card, both with
connected displays. (Connected to the same monitors, in fact).
The AMD card is the EFI primary card, and is what drives the kernel
framebuffer. This is correct; it's the one that's plugged into both
monitors.
modesetting, for soume reason, picks the nvidia card as the output
master and the AMD card as an output slave. This is good, in that it can
drive both my monitors, and bad in that rendering on the nvidia card is
literally seconds-per-frame (presumably it lacks reclocking support).
ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: xserver-xorg-core 2:1.18.4-1ubuntu6
Uname: Linux 4.7.5+bcachefs-1.git20160928.5a6a7df--generic x86_64
ApportVersion: 2.20.3-0ubuntu7
Architecture: amd64
CompizPlugins: No value set for
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: GNOME
Date: Thu Sep 29 11:41:57 2016
DistUpgraded: Fresh install
DistroCodename: yakkety
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
Advanced Micro Devices, Inc. [AMD/ATI] Pitcairn XT [Radeon HD 7870 GHz
Edition] [1002:6818] (prog-if 00 [VGA controller])
Subsystem: Gigabyte Technology Co., Ltd Pitcairn XT [Radeon HD 7870 GHz
Edition] [1458:2554]
NVIDIA Corporation GM107 [GeForce GTX 750 Ti] [10de:1380] (rev a2) (prog-if 00
[VGA controller])
Subsystem: ASUSTeK Computer Inc. GM107 [GeForce GTX 750 Ti] [1043:84bb]
MachineType: System manufacturer System Product Name
ProcKernelCmdLine:
BOOT_IMAGE=/vmlinuz-4.7.5+bcachefs-1.git20160928.5a6a7df--generic
root=/dev/nvme0n1p6 ro quiet splash nvidia_367_drm.modeset=1 vt.handoff=7
SourcePackage: xorg-server
UpgradeStatus: No upgrade log present (probably fresh install)
XorgConf:
Section "Device"
Identifier "Default Card 1"
BusID "PCI:2@0:0:0"
EndSection
dmi.bios.date: 05/13/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1805
dmi.board.asset.tag: Default string
dmi.board.name: Z170 PRO GAMING
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr1805:bd05/13/2016:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ170PROGAMING:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.70-1
version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.3-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.3-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-1ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20160706-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-2
xserver.bootTime: Thu Sep 29 11:37:47 2016
xserver.configfile: /etc/X11/xorg.conf
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.4-1ubuntu6
xserver.video_driver: modeset
** Affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug ubuntu yakkety
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which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1628744
Title:
Modesetting picks incorrect card as output master
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