[Bug 98523] Can't run without "nomodeset" on MacPro6,1 with two AMD R9 280X Tahiti video cards

[Bug 98523] Can't run without "nomodeset" on MacPro6,1 with two AMD R9 280X Tahiti video cards

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https://bugs.freedesktop.org/show_bug.cgi?id=98523

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Driver/Radeon               |DRM/Radeon
            Product|xorg                        |DRI
            Version|git                         |unspecified
         QA Contact|xorg-team@lists.x.org       |
           Assignee|xorg-driver-ati@lists.x.org |dri-devel@lists.freedesktop
                   |                            |.org

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[Bug 98523] Can't run without "nomodeset" on MacPro6,1 with two AMD R9 280X Tahiti video cards

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https://bugs.freedesktop.org/show_bug.cgi?id=98523

--- Comment #1 from Heigh <Heigh.Leigh171@gmail.com> ---

Hi Michel,

Thank you for looking into this, and for assigning the bug.

In the meantime, I have found a workaround or a solution.

The system needs to be booted with systemd-boot bootloader
(or perhaps any other supporting UEFI boot)

When I boot Ubuntu with standard, installed during installation
grub2, radeon driver would't detect external displays connected via
Display Ports.

But when I boot system using systemd-boot installed by Arch Linux (or KaOS),
it detects displays normally, and works correctly, supporting
all external displays as expected.

I think this is related to some aspects of the hardware not
exposed in BIOS boot mode, and exposed in EFI/UEFI boot mode.

Preferred solution would be working radeon driver in BIOS mode
if possible, or, if that is not possible, some meaningful message 
in the system journal explaining that certain features 
(e.g. external monitors via Display Port) will not be supported 
unless the system is booted in EFI/UEFI mode.

Thank you,
Heigh

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[Bug 98523] Can't run without "nomodeset" on MacPro6,1 with two AMD R9 280X Tahiti video cards

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https://bugs.freedesktop.org/show_bug.cgi?id=98523

Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOTOURBUG
             Status|NEW                         |RESOLVED

--- Comment #2 from Alex Deucher <alexdeucher@gmail.com> ---
The problem is Macs expose the vbios for some cards in a proprietary way. 
IIRC, the vbios is only available via EFI prior to the OS loading.  The
bootloader needs to snag the vbios and then make it available to the OS when it
loads.  I'm not really a Mac expert so I don't remember all the details. 
There's no way to work around it in the driver.

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