On Saturday, April 11, 2020 at 7:10:18 PM UTC, Sven Semmler wrote:
>
> On Sat, Apr 11, 2020 at 02:48:17PM -0400, Chris Laprise wrote: 
> > I've never had a problem with KDE in dom0 as long as the display manager 
> is 
> > switched to sddm and BIOS is set to integrated graphics. "Discrete 
> graphics" 
> > usually means Nvidia, which is poorly supported in open source operating 
> > systems. 
>
> Funny enough, motivated by your comment I went and switched back to 
> "hybrid" (aka integrated) graphics ... and all my issues came back! 
>
> So while I am sure your statement is correct in general, on my 
> particular setup switching to the discrete graphics makes everything 
> work. Every rule has an exception I guess. 
>

Hybrid graphics routing for nvidia optimus has changed over the years. 

On older laptop models, one could select among integrated, hybrid and 
discrete. For many of us, selecting integrated graphics was the most stable 
option.

On more recent optimus laptops, integrated is no longer an option, you can 
only select between hybrid and discrete. I believe this limitation is due 
to how the signal routing now requires some level of firmware support in 
the discrete chipset to get video out. 

In any case, hybrid has always (nearly?) impossible to get working under 
Xen/Qubes...so the next best option has been making discrete work.

Brendan

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