From the logs it looks like you have several errors like
Quote:
(WW) "xwayland" is not to be loaded by default. Skipping.
(WW) Warning, couldn't open module nv
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Not sure if those are important, but for me it looks like the driver is not supporting the card :
Quote:
(II) NOUVEAU driver
[ 20.500] (II) NOUVEAU driver for NVIDIA chipset families :
[ 20.500] RIVA TNT (NV04)
[ 20.500] RIVA TNT2 (NV05)
[ 20.500] GeForce 256 (NV10)
[ 20.500] GeForce 2 (NV11, NV15)
[ 20.500] GeForce 4MX (NV17, NV18)
[ 20.500] GeForce 3 (NV20)
[ 20.501] GeForce 4Ti (NV25, NV28)
[ 20.501] GeForce FX (NV3x)
[ 20.501] GeForce 6 (NV4x)
[ 20.501] GeForce 7 (G7x)
[ 20.501] GeForce 8 (G8x)
[ 20.501] GeForce GTX 200 (NVA0)
[ 20.501] GeForce GTX 400 (NVC0)
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and the card looks to be
(whis is some 9600 ?)
Anyway to see if the card would work with your 2 screens I would suggest to use the nvidia driver as nouveau still does not reach a high performance.
For my card it's almost unusable and even the vesa driver does better ....