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separate framebuffer per head?
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Slippery Jim
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Joined: 08 Jan 2005
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PostPosted: Thu Mar 31, 2016 1:24 am    Post subject: separate framebuffer per head? Reply with quote

I want to have separate, independent framebuffers for each of the outputs on my radeon 7750 card, but I only get the single /dev/fb0 created on bootup. Also, it appears to be mirrored across all my outputs. There must be a config option for this somewhere either in the kernel, in grub, or in udev, but I can't find it. Can anyone point me in the right direction?
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s4e8
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Joined: 29 Jul 2006
Posts: 309

PostPosted: Thu Mar 31, 2016 3:01 am    Post subject: Reply with quote

No, drm guys think fbdev/fbcon is legacy, they are trying to remove fbdev completely.
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chithanh
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Joined: 05 Aug 2006
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PostPosted: Thu Mar 31, 2016 4:12 pm    Post subject: Reply with quote

You may be able to use both monitors with KMSCON. It got removed from Gentoo however due to lack of maintenance.
For separate, independent heads you will probably have to wait until DRM modesetting nodes are implemented.
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Slippery Jim
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PostPosted: Thu Mar 31, 2016 11:01 pm    Post subject: Reply with quote

Didn't realize fbdev and kms framebuffer were separate subsystems; I just assumed that fbdev was now implemented on top of KMS/DRM, or something like that. Guess I'll have to dig into the DRM interface to see if I can drive the outputs directly. Thanks for the heads-up, guys.
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