Messages in this thread | | | Subject | Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-Q9 | From | Alan Cox <> | Date | Sat, 04 Sep 2004 17:52:14 +0100 |
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On Sad, 2004-09-04 at 01:04, Lee Revell wrote: > This is looking more and more like a video driver problem:
Not really. The delay is too small and X is smarter than this. (except a VIA case that only recently got squished).
> The video cards have a command FIFO that is written to via the PCI bus. > They also have a status register, read via the PCI bus, which says > whether the command FIFO is full or not. The hack is to not check > whether the command FIFO is full before attempting to write to it, thus > saving a PCI bus read.
On problem cards X defaults to polling the status FIFO. You can tell it to be rude but you have to actively do so. Newer PCI 2.x specs also have a thing or two to say on the subject
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