how do I check if linux can see and use my discrete graphics card?

@lizardsquid see: lspci | grep -i "VGA"
check if driver loaded:
dmesg | grep "nvidia" # or radeon, fglrx, nouveau, bla
if can use: some GL-demo, which displays the default graphics card?

@snaums lspci doesn't exist on my system for some reason, but dmesg shows positive results for both radeon and amdgpu

when I run stuff in wine, it can only detect my integrated card

@lizardsquid
Your ATI card is likely supported on Linux through MESA, but I'm not sure how it'll work on your frankendistro... I have zero experience with sabayon or gentoo...
@snaums

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