two same ati cards, xrandr render offload

[Alex Deucher]

The multi-GPU prime stuff doesn't work with an xorg config.  It only works if you let X autoconfigure the GPUs.  I think there were x server patches at one point to allow this, but I'm not sure if they ever made it upstream.

Alex 


     On Friday, July 17, 2015 1:57 PM, Alexandr Gluzskiy <sss at sss.chaoslab.ru> wrote:
   
 

 Good day to all.
i have question about xrandr render offloading feature
i have multihead setup:
xrandr
Screen 0: minimum 320 x 200, current 5120 x 1200, maximum 16384 x 16384
DisplayPort-0 connected 1920x1200+1280+0 (normal left inverted right x 
axis y axis) 518mm x 324mm
    1920x1200    59.95*+
    1920x1080    59.99
    1600x1200    60.00
    1680x1050    59.95
    1600x900      59.98
    1280x1024    60.02
    1440x900      59.89
    1280x800      59.81
    1280x720      59.97
    1024x768      60.00
    800x600      60.32
    640x480      60.00
HDMI-0 connected 1920x1080+3200+0 (normal left inverted right x axis y 
axis) 510mm x 290mm
    1920x1080    60.00*+  50.00    59.94
    1920x1080i    60.00    50.00    59.94
    1680x1050    59.88
    1280x1024    60.02
    1280x960      60.00
    1152x864      59.97
    1280x720      60.00    50.00    59.94
    1024x768      60.00
    800x600      60.32
    720x576      50.00
    720x480      60.00    59.94
    640x480      60.00    59.94
DVI-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 
338mm x 270mm
    1280x1024    60.02*+  75.02
    1280x960      60.00
    1152x864      75.00
    1024x768      75.08    70.07    60.00
    832x624      74.55
    800x600      72.19    75.00    60.32    56.25
    640x480      75.00    72.81    66.67    60.00
    720x400      70.08

have one screen in X:

cat /etc/X11/xorg.conf
Section "ServerFlags"
    Option "BlankTime"  "10"
    Option "StandbyTime"  "20"
    Option "SuspendTime"  "30"
    Option "DontZap" "true"
    Option "DRI2" "true"
    Option "DRI3" "false"
    Option "IgnoreABI" "false"
    Option "AutoAddDevices" "true"
    Option "AutoEnableDevices" "true"
    Option "AllowGLXWithComposite" "true"
    Option "AllowMouseOpenFail" "true"
    Option "Clone" "off"
    Option "AIGLX" "on"
##    Option "Pixmap" "32"
    Option "Xinerama" "false"
EndSection

Section "Extensions"
    Option "Composite" "Enable"
#    Option "DAMAGE" "Enable"
#    Option "DOUBLE-BUFFER" "Enable"
#    Option "GLX" "Enable"
#    Option "RANDR" "Enable"
    Option "RENDER" "Enable"
#    Option "XVideo" "Enable"
#    Option "MIT-SHM" "Enable"
#    Option "DPMS" "Enable"
EndSection

Section "Module"
#    Load "dri2"
#    Load "dri3"
#    Load "glamoregl"
    SubSection "extmod"
        Option  "omit XFree86-DGA"
    EndSubSection
EndSection

Section "Monitor"
    Identifier "DVI-0"
    Option "PreferredMode" "1280x1024"
EndSection

Section "Monitor"
    Identifier "DisplayPort-0"
    Option "PreferredMode" "1920x1200"
    Option "Primary" "true"
EndSection

Section "Monitor"
    Identifier "HDMI-0"
    Option "PreferredMode" "1920x1080"
EndSection

Section "Device"
    Identifier "card1"
    Driver "radeon"
#    Option "EnablePageFlip" "false"
#    Option "Accel" "on"
    Option "DRI3" "off"
    BusID "PCI:1:0:0"
EndSection

Section "Device"
    Identifier "card2"
    Driver "radeon"
#    Option "EnablePageFlip" "false"
#    Option "Accel" "off"
    Option "DRI3" "off"
    BusID "PCI:4:0:0"
EndSection


Section "Screen"
    Identifier "screen1"
    Device "card1"
    Monitor "DVI-0"
    Monitor "DisplayPort-0"
    Monitor "HDMI-0"
    DefaultDepth    24
    SubSection            "Display"
        Depth              24
        Virtual 5120 1080
    EndSubSection
EndSection

#Section "Screen"
#    Identifier "screen2"
#    Device "card2"
#    Monitor "DVI-1"
#    DefaultDepth    24
#EndSection

Section "ServerLayout"
    Identifier "main_layout"
    Screen 0 "screen1"
#    Screen 1 "screen2" LeftOf "screen1"
EndSection

Section "dri"
  Mode 0666
EndSection


and here i am not sure if i really need to write anything about second 
gpu in xorg.conf


so, this all working fine and now i want to offload rendering to second 
gpu, for testing, for load balancing (first gpu have much greater 
temperature than second), so i starting to configure via xrandr, and 
stuck on first command:
  xrandr --listproviders
Providers: number : 1
Provider 0: id: 0x58 cap: 0xf, Source Output, Sink Output, Source 
Offload, Sink Offload crtcs: 6 outputs: 3 associated providers: 0 
name:radeon


P.S. sorry for my bad english, it's not my native language
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