I have been experiencing the same thing with my iBook and PowerBook. Sent from my iPhone
> On Feb 4, 2016, at 8:47 PM, Mike <michael.hel...@gmail.com> wrote: > > Hi. > Managed to get the Radeon R300 running on mesa 11.1.1 with an old 2013 patch > from Michel Dànzer, next problem is of course enabling agpmode, running with > pci-mode with radeon.agpmode=-1 works, but is of course slow, and seems to > load the cpu a lot. > > Upon initial investigation i could not initially believe agp could be this > this broken for this long, until i found this. > "committed with Ben Skeggs on Feb 26, 2013" > https://github.com/DespairFactor/bullhead/commit/650e1203c11354ba84d69ba445abc0efcfe3890a > http://lxr.free-electrons.com/source/drivers/gpu/drm/nouveau/nouveau_agp.c?v=4.2 > #ifdef __powerpc__ > /* Disable AGP by default on all PowerPC machines for > * now -- At least some UniNorth-2 AGP bridges are > * known to be broken: DMA from the host to the card > * works just fine, but writeback from the card to the > * host goes straight to memory untranslated bypassing > * the GATT somehow, making them quite painful to deal > * with... > */ > if (nouveau_agpmode == -1) > return false; > #endif > > and now later this: > https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/nouveau/nvkm/subdev/pci/agp.c > #ifdef __powerpc__ > /* Disable AGP by default on all PowerPC machines for now -- At > * least some UniNorth-2 AGP bridges are known to be broken: > * DMA from the host to the card works just fine, but writeback > * from the card to the host goes straight to memory > * untranslated bypassing that GATT somehow, making them quite > * painful to deal with... > */ > mode = 0; > #endif > > All seems to point to serious issues had around the time of change to ums to > kms and a serious regression hitting the linux kernel? No? > > Cheers > -Mike > _______________________________________________ > Linuxppc-dev mailing list > Linuxppc-dev@lists.ozlabs.org > https://lists.ozlabs.org/listinfo/linuxppc-dev
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