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I was surprised that lspci and the nvidia x server settings application didn't give me the same amount of video memory for my nvidia card. A bit of googling brought me to this site. There it says that lspci doesn't show all the video memory.

So for the nvidia cards I can use the nvidia x server settings application to find out the correct amount of video memory but how do I do it for a radeon card when using the open source radeon driver?

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You could install the proprietary driver, get what you need from AMD Catylyst Control Panel and then uninstall. Kinda messy, but it works...

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It'd be helpful to include a link to instructions about how to do this. – Arronical Oct 7 '15 at 11:54

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