[Bug 103599] My AMD Radeon R7 M265 dedicated VGA not recognized by ATI Radeon driver

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Nov 6 23:04:07 UTC 2017


--- Comment #13 from Alex Deucher <alexdeucher at gmail.com> ---
(In reply to yousifjkadom2-new from comment #12)
> I understand now ! Finally I get releaf from this headache !
> Only one question (last one here) whay laptop can not perform automatic
> switch between dedicated VGA & built-in Intel card ? Is the case is same in
> Windows OS ? I never ever shift to Windows OS, but I like to be oriented. Is
> amdgpu same regarding need for manual switching between built-in & dedicated
> cards ? 

The driver does do dynamic switching.  The hardware is the same.  There are no
displays connected to the dGPU, so it can only be used for offscreen rendering.
 The integrated GPU always handles the displays.  I think windows uses app
profiles to determine which GPU does the rendering whereas on Linux, it's
explicit (you can choose which GPU to use per app).  You could do something
similar on Linux (e.g., set DRI_PRIME=1 in the script that starts the game or
in the launchers).

> Or it could be that I'm wrong in principle & there is no such automatic
> switching ? They said that Fedora 25 + will support such hybrid system &
> from that time I have in my mind an automatic switch ..... !  

It's automatic in that the dGPU is only powered on when you request rendering. 
You just get to pick when the dGPU is used. see above.

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