Re: [XFree86] All annoying error in I830WaitLpRing() in some details

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On Tue, 2003-10-07 at 18:19, David Dawes wrote:
> On Tue, Oct 07, 2003 at 05:16:28PM +0300, Alexey E. Suslikov wrote:
> >Tuesday, October 7, 2003, 4:53:45 PM, you wrote:
> >
> >>> bang! this is it: the bug still exist, at least on i830m (like in my
> >>> case). setting "NoAccel" "true" is turning off Xaa functions for first.
> >>> linux people did so. i did too, but with no success :(
> >
> >> I've tried very hard and I'm not seeing the problem any more.
> >> If you are still seeing it maybe you could do a little 
> >> investigation into its cause?
> >
> >> One thing you may want to try is setting
> >pI830->>NeedRingBufferLow = TRUE
> >> This isn't done for the i830 as it didn't seem to be necessary.
> >
> >ok. i will try and report as soon as possible.
> 
> That shouldn't make any difference to the noaccel case, since the
> ring buffer isn't allocated then.
> 
> >> Yes, turning XAA off will work around the problem. The LpRing is
> >> only used for that.
> >
> >no. as i described above, this recipe was digged from mailing list
> >and solves the problem for some linux people. but not for me on
> >OpenBSD and this guy on NetBSD.
> 
> A couple of other things I can think of are 1) some subtle difference in
> the implementation of the agpgart support for those two platforms, or
> 2) the fact that the BIOS is executed via the emulator on the BSDs but
> uses vm86 mode on Linux.  Does anyone running FreeBSD see the problem?
> If not, that should rule out 2).  To take the agp support out of the
> picture, disable the HW cursor, and make sure the videoram is set to
> some amount lower than what the BIOS preallocates at boot time (e.g.,
> 4096).  From your noaccel log, the agp interface is only used to allocate
> the HW cursor space (because it needs a physical address).  That means
> just adding 'Option "SWCursor"' to your Device section should be
> sufficient for this test.

A couple of FreeBSDers have had problems with I830WaitLpRing errors on
switching to a different VT.

-- 
Eric Anholt                                eta@xxxxxxxxxx          
http://people.freebsd.org/~anholt/         anholt@xxxxxxxxxxx


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