possible regression Radeon RV280 (R3xx/R4xx ?) card freeze, re-apply old patch ?

[Michel Dänzer]

On Mit, 2013-11-13 at 19:07 +0100, Jochen Rollwagen wrote:
> I started investigating the problem because AGP mode used to work with
> the UMS drivers (although I now understand they didn’t really use AGP
> memory)

They used AGP memory but didn't dynamically bind memory to the AGP
aperture or unbind it from there.


> and in the second patch I mentioned below Benjamin Herrenschmidt
> stated that “there's a chip errata (for the pre-R600 chips). On those
> chips, the aperture must be aligned to the aperture size (that is
> FB_START in MC_FB_LOCATION must be aligned to the aperture size).”
> Since that workaround/patch definitely isn’t in the current DRM code
> any more (probably got lost in the transition to KMS) my idea was to
> re-apply the three-line workaround/patch (which should be quite
> trivial given the comment in radeon_vram_location in the drm kernel
> code).

So, have you verified that the aperture is not aligned to its size for
you? If it's not, does aligning it help stability with AGP?


-- 
Earthling Michel Dänzer            |                  http://www.amd.com
Libre software enthusiast          |                Mesa and X developer