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Can no longer run multiseat w/ 2 nvidia cards

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https://bbs.archlinux.org – I have the same exact problem with Kubuntu 11.10 and 3 NVidia cards. My multiseat starts correctly on all 3 displays, but after I logout from seat 2 or 3 I get there[ 37769.447] (EE) NVIDIA(GPU-1): EVO Push buffer channel allocation failed[ 37769.447] (EE)  *** Aborting ***[ 37769.447] (EE) NVIDIA(GPU-1): Failed to allocate EVO core DMA push buffer[ 37769.447] (EE)  *** Aborting ***[ 37769.450] Backtrace:[ 37769.450] 0: /usr/bin/X2 (xorg_backtrace+0x26) [0x460566][ 37769.450] 1: /usr/bin/X2 (0x400000+0x64b7a) [0x464b7a][ 37769.450] 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7fdd0e5f (HowTos)