[Bug 94811] ATI radeon driver displays nothing or a client refused to switch message on hybrid graphics

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94811

--- Comment #8 from Alex Deucher <alexdeucher at gmail.com> ---
(In reply to Saurav from comment #7)
> (In reply to Michel Dänzer from comment #6)
> > Looks like the AMD GPU has no physical display connections, so running X on
> > that alone isn't possible, and I'm not sure vgaswitcheroo is useful either.
> 
> How does fglrx work on Ubuntu 15.10, then? Booting with fglrx installed
> (which creates the XOrg configuration file I have posted for radeon but with
> "fglrx" instead of "radeon" for the driver) works properly and selects the
> AMD chip. The active GPU is shown as the AMD one in both the GUI
> (Unity/GNOME system details panel) and by the text-mode tools (glxinfo,
> inxi, etc.).

The intel driver still drives the display.  fglrx just copies the rendered
content to the intel display buffer.

> 
> Also, with the radeon driver, the system does not select the AMD chip for
> HDMI either.

The AMD chip you have does not even have display hardware.  You have a muxless
system which means the dGPU is only used for offscreen rendering.  The dGPU
renders to an offscreen buffer and it's copied to the integrated GPU for
display.

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