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List:       kwin
Subject:    Re: Review Request: Add support for graphicssystem selection
From:       Thomas_Lübking <thomas.luebking () gmail ! com>
Date:       2012-01-10 15:27:00
Message-ID: op.v7vjvask9bmiid () localhost ! localdomain
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Am 10.01.2012, 10:03 Uhr, schrieb Kai Uwe Broulik <kde@privat.broulik.de>:

> On Dec. 18, 2011, 5:23 p.m., Martin Gräßlin wrote:
>>  that's a good idea. Finally we see in the GUI what is actually  used.
>
> The downside of this change is, if KWin falls back to XRender once  
> (which happens quite often to me) you manually have to change it back to  
> OpenGL in the settings.
>
> Situation is: My notebook has hybrid graphics and when I am at  
> university I use the powersaving Intel graphics and a kernel modul that  
> disables the ATI graphics through ACPI to save power. However, when I am  
> back at home, I start the computer and run my little script that  
> blacklists said module and restart. But then already KWin fell back to  
> XRender because I already set the BIOS to "Discrete graphics" while  
> still the proper driver is not loaded. And on the next restart then:  
> Blur et al is not working naturally because it now uses XRender.

That doesn't cut it. The general case of such Janus system actually  
requires a profile management, since it affects more than just "can use  
opengl or not".
(Compositing might fail altogether, OpenGL can be claimed "crashy - don't  
try", the lanczos filter might work on one chip, but kill or pace out the  
other, ...)


Regarding your particular situation: both of your GPUs should support  
OpenGL compositing, yesno?
The issue arises when you swap the GPU, so it's actually more a "how to  
swap GPUs" issue than a "I dynamically want xrender and opengl" issue, is  
that correct?

I don't think this is an issue at all, ot at least should not.
Can you please list the exact steps for switching the GPU, including all  
reboots, X process restarts, ....
And esp. why you need to alter a BIOS setting when the AMD GPU is actually  
disabled by a kernel module.

Cheers,
Thomas
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