Re: Screen corruption using radeon kernel driver

[Mikhail Krylov <sqarert@gmail.com>]

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On Tue, Nov 29, 2022 at 09:44:19AM -0500, Alex Deucher wrote:
> On Mon, Nov 28, 2022 at 3:48 PM Mikhail Krylov <sqarert@gmail.com> wrote:
> >
> > On Mon, Nov 28, 2022 at 09:50:50AM -0500, Alex Deucher wrote:
> >
> > >>> [excessive quoting removed]
> >
> > >> So, is there any progress on this issue? I do understand it's not a high
> > >> priority one, and today I've checked it on 6.0 kernel, and
> > >> unfortunately, it still persists...
> > >>
> > >> I'm considering writing a patch that will allow user to override
> > >> need_dma32/dma_bits setting with a module parameter. I'll have some time
> > >> after the New Year for that.
> > >>
> > >> Is it at all possible that such a patch will be merged into kernel?
> > >>
> > > On Mon, Nov 28, 2022 at 9:31 AM Mikhail Krylov <sqarert@gmail.com> wrote:
> > > Unless someone familiar with HIMEM can figure out what is going wrong
> > > we should just revert the patch.
> > >
> > > Alex
> >
> >
> > Okay, I was suggesting that mostly because
> >
> > a) it works for me with dma_bits = 40 (I understand that's what it is
> > without the original patch applied);
> >
> > b) there's a hint of uncertainity on this line
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/radeon/radeon_device.c#n1359
> > saying that for AGP dma_bits = 32 is the safest option, so apparently there are
> > setups, unlike mine, where dma_bits = 32 is better than 40.
> >
> > But I'm in no position to argue, just wanted to make myself clear.
> > I'm okay with rebuilding the kernel for my machine until the original
> > patch is reverted or any other fix is applied.
> 
> What GPU do you have and is it AGP?  If it is AGP, does setting
> radeon.agpmode=-1 also fix it?
> 
> Alex

That is ATI Radeon X1950, and, unfortunately, radeon.agpmode=-1 doesn't
help, it just makes 3D acceleration in games such as OpenArena stop
working.

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