cinnamon only software rendering on multi card system

[berni123]

Hi,

I am running LMDE 2 Betsy only with software rendering after activating a second graphics card and multi head:

cards:

Code: Select all

02:00.0 VGA compatible controller: NVIDIA Corporation C77 [GeForce 8200] (rev a2) (prog-if 00 [VGA controller])
	Kernel driver in use: nouveau
03:00.0 VGA compatible controller: NVIDIA Corporation G84 [GeForce 8600 GT] (rev a1) (prog-if 00 [VGA controller])
	Kernel driver in use: nouveau

xorg.conf (only two monitors currently active, but three configured):

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Section "ServerLayout"
    Identifier  "Layout0"
    Option      "Xinerama"	"on"
    Option	"Clone"		"off"
    Screen      0  "Screen0" 0 0
    Screen      1  "Screen1" RightOf  "Screen0"
    #Screen      2  "Screen2" LeftOf   "Screen0"
EndSection

Section "Device"
    Identifier  "Device0"
    Driver      "nouveau"
    BusID       "PCI:2:0:0"
    Option      "ZaphodHeads" "HDMI-A-1"
    Screen      0
EndSection

Section "Device"
    Identifier  "Device1"
    Driver      "nouveau"
    BusID       "PCI:3:0:0"
    Option      "ZaphodHeads" "DVI-I-1"
    Screen      0
EndSection

Section "Device"
    Identifier  "Device2"
    Driver      "nouveau"
    BusID       "PCI:3:0:0"
    Option      "ZaphodHeads" "DVI-I-2"
    Screen      1
EndSection

Section "Screen"
    Identifier  "Screen0"
    Device      "Device0"
EndSection

Section "Screen"
    Identifier  "Screen1"
    Device      "Device1"
EndSection

Section "Screen"
    Identifier  "Screen2"
    Device      "Device2"
EndSection

After login via mdm, cinnamon reports that it is currently running without hardware-acceleration.

Problem: running vdr-sxfe the video is very slow, showing that hardware-rendering is needed.

Does anyone has a hint how to activate acceleration?
Note: the nvidia 340.96 driver does not work properly with this system, so I can only use the nouveau driver.
Or does the nouveau driver do not support it?
Or is there another way to get the multi card/multi display system running?
The xrandr option is only working with the primary card. With only one card cinnamon does not have any problems with hardware acceleration.

Regards,
Bernd