[Bug 103678] gdm couldn't start with Vega RX 56 video card

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103678

--- Comment #15 from Christian König <deathsimple at vodafone.de> ---
(In reply to mikhail.v.gavrilov from comment #13)
> a. Intel Graphics Processor -> Enabled
> b. Initial display output -> PCIe 2 slot
> c. A monitor connected to Radeon
> BIOS screenshot: https://bugs.freedesktop.org/attachment.cgi?id=135427
> In this case all BIOS output, boot messages and the console  passes through
> the Radeon graphics card.
> But graphics subsusystem couldn't launched.
> The Radeon turbine works silent.
> Demonstration: https://youtu.be/jjGO650EE80
> I think this is bug because even if video card unsupported it must works in
> VESA mode. This behaviour worked in Windows.

Interesting, that indeed that should work. Could be a bug in the VESA BIOS or
the driver touching the hardware even if it decided not to do so.

Please try booting with modprobe.blacklist=amdgpu on the kernel commandline.

> $ glxinfo | grep -i "OpenGL version"
> OpenGL version string: 3.0 Mesa 17.2.4
> Which minimal version is needed?
> I see on Fedora 27 I have Mesa 17.2.4

Not the slightest idea when Vega10 support was added to Mesa, but 17.2.4 is
only a few days old so that could work.

I would try to get X working with only the kernel first. If you have that
working and still no OpenGL you can still compile Mesa on your own.

Alex Kernel branch is here BTW: https://cgit.freedesktop.org/~agd5f/linux/

You can also find a amd-staging-4.13 branch there, but that is a ~month old and
not maintained any more. amd-staging-drm-next is the latest development work.

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