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cloverskull
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Joined: 03 Nov 2017
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PostPosted: Mon Jul 06, 2020 2:37 am    Post subject: Is X850XT supported? Reply with quote

I’ve been struggling for hours to get a linux distro to boot on my G5 with AGP Radeon X850XT and am about to throw this computer in the garbage. Lol. Sorry for being dramatic :)

As far as I can tell the X850XT is simply _not_ supported. At some point during the boot process, no matter what kernel args I have so far attempted, I can’t get this darned thing to work. It’s very frustrating. During the boot process, regardless of distro, suddenly the screen will just go black. CTRL-ALT-F<#> doesn’t do anything, it’s just completely unresponsive. Any ideas here? Am I hosed with this GPU?

Thanks!
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Maitreya
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PostPosted: Mon Jul 06, 2020 1:11 pm    Post subject: Re: Is X850XT supported? Reply with quote

cloverskull wrote:
I’ve been struggling for hours to get a linux distro to boot on my G5 with AGP Radeon X850XT and am about to throw this computer in the garbage. Lol. Sorry for being dramatic :)

As far as I can tell the X850XT is simply _not_ supported. At some point during the boot process, no matter what kernel args I have so far attempted, I can’t get this darned thing to work. It’s very frustrating. During the boot process, regardless of distro, suddenly the screen will just go black. CTRL-ALT-F<#> doesn’t do anything, it’s just completely unresponsive. Any ideas here? Am I hosed with this GPU?

Thanks!


It's a card from 2004 so yes it's a wee bit on the old side.
But as it's based on the r480 (not the rx480 from more recent years) it is supported by the radeon driver.
Set VIDEO_CARDS="radeon r300" and be sure to have the right firmware available for the kernel to load (the probable reason you get a black screen)
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NeddySeagoon
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PostPosted: Mon Jul 06, 2020 1:39 pm    Post subject: Reply with quote

cloverskull,

Build Simple Framebuffer into the kernel too.
I suspect the kernel is switching to radeondrmfb and you have some bits missing or you have other Framebuffer hardmare drivers enabled that interfere with radeondrmfb.

Simple, VESA, VGA and EFI are safe as they don't do any hardware set up.
Your hardware is too old for EFI and I suspect VGA is not supported on a G5 either.
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cloverskull
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PostPosted: Mon Jul 06, 2020 6:14 pm    Post subject: Reply with quote

Hey folks, thanks for the replies :)

I think the issues that I'm having are a bit unique. I believe the X800XT and X850XT on Mac were unique and there may not actually be linux support at all. Most of the research I've done suggests that there have traditionally been issues with these cards and that they haven't been usable in the past...I was hoping that would be different but evidently the Mac version of the cards had a different BIOS.

I have very significant issues booting anything. If there's a simple framebuffer built into the kernel, what can I use at boot to kill the Radeon framebuffer, KMS, etc., and just use the simple framebuffer?

The only thing I can actually get to boot to a screen I'm able to use right now is the Debian 10 PPC port, which goes to a textmode installer. This suggests that there must be a textmode interface I can use to boot post installation, but I can't figure out the magic boot string to issue at yaboot.

I appreciate the help here :)
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Ant P.
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PostPosted: Mon Jul 06, 2020 10:47 pm    Post subject: Reply with quote

Try booting with agp=off. Some of the X models from that era use pcie-to-agp bridge chips and driver support for them has always been hit or miss.

Besides, the AGP code is bitrotting to the point where upstream intends to remove it.
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