Messages in this thread | | | Date | Tue, 30 Nov 1999 10:35:50 +0100 | From | Jakub Jelinek <> | Subject | Re: fbcon + scrolling = irq timeouts? |
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On Tue, Nov 30, 1999 at 10:21:31AM +0100, Gabor Lenart wrote: > On Mon, Nov 29, 1999 at 10:57:55PM +0000, Alan Cox wrote: > > > Has anyone else experienced IRQ timeouts while playing MP3s and scrolling > > > large text files in a VESA framebuffer console? From what I can see, no > > > cards are conflicting with each other in any way. Maybe someone else can > > > help me out. Vital data: > > > > Welcome to VESA frame buffer. It uses BIOS functions. These can lock the > > interrupts off for a long time. Basically no cure available > > VESA-2 compilant BIOSes introduced protected mode interface for video > functions except (afaik) mode switching but it's needed only once. > And if linear frame buffer is supported by your card, you have got the same > memory mapped video ram area like with non-vesa frame buffer, isn't it ? > I don't understand the differnece between vesa and non-vesa frame buffer and > why do you lock interruppts ?
VESA BIOS is used for display panning if that feature has been enabled and for that it is used on every scrolling. But users can request video=vesa:redraw (I think it is the default) and no BIOS will be involved after linear mode setup.
Cheers, Jakub ___________________________________________________________________ Jakub Jelinek | jakub@redhat.com | http://sunsite.mff.cuni.cz/~jj Linux version 2.3.18 on a sparc64 machine (1343.49 BogoMips) ___________________________________________________________________
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