[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 #9 from Saurav <saurav1.net at gmail.com> ---
(In reply to Alex Deucher from comment #8)
> (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.

OK, so is it possible to do something similar (copying to the Intel buffer)
with the radeon driver?

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