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Sebastian Beßler posted on Sun, 13 Dec 2009 01:32:59 +0100 as excerpted: |
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> I hope somebody could help me with a last problem I have regarding KMS. |
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> |
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> With KMS the framebuffer uses the correct resolution (1440x900) but only |
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> part of the screen is used. On the right and bottom side of the screen |
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> is a thick white border. |
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> The part of the screen that is used shows all contents so the problem is |
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> annoying but no stopper. |
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> |
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> With X there a no problems so far. |
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I /think/ I might have the answer, but I've never tried it without the |
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other module since I knew I needed it, so I'm not sure whether the |
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behavior you describe is what would result if it wasn't there or not, but |
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it sounds like what I'd expect the problem to be, so I'll explain and you |
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can check and see if I'm right, or not. =:^) |
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There are two separate kernel console interfaces, the traditional low |
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resolution vgacon, and the higher resolution fbcon, that works with |
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whatever framebuffer driver your hardware runs with (or the generic |
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vesafb or vga16fb, if nothing else). |
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What the symptoms sound like to me is that you have KMS going, but only |
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have vgacon turned on, so its limited resolution is going in the corner |
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of the higher resolution KMS based framebuffer, because you don't have |
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fbcon turned on. |
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FWIW, that's in kconfig under device drivers, graphics support, console |
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display driver support. You want both framebuffer console support (aka |
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fbcon), and vga text console (aka vgacon), turned on, framebuffer for |
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normal use, and vgacon as a backup, when things go wrong, or so if the |
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card goes bad you can put whatever in and be up and running again at |
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least with the lower vga resolution, even if the new card doesn't use the |
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same kms driver and thus won't come up in kms/framebuffer mode. |
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If both of those are on, then it's something else, but that sure sounds |
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to me like what I'd guess vgacon only, on a kms driven monitor, would |
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look like, so that's what I'm guessing it is. |
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-- |
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Duncan - List replies preferred. No HTML msgs. |
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"Every nonfree program has a lord, a master -- |
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and if you use the program, he is your master." Richard Stallman |
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