<div dir="ltr"><div>source and sink only make sense in the specific randr commands to set this up. Essentially a source is a producer and sink is a consumer. In a nutshell, devices can either: drive displays, render content, or both. For example, a USB to VGA adapter can just display, but it has no graphics engine to actually draw any content. You can also have devices which have no display hardware (like the chip in this thread) or no displays physically wired to the chip which can only render. Finally you have the traditional case where you have a device which has display hardware with display connectors wired up which also has a graphics engine. Regardless of what hardware capabilities the device has, the display manager can pick which one(s) will be used for display and which one will be used for rendering. If the rendering and display device is the same, everything happens on the device directly. If the rendering and display devices are separate, the rendering device will render to it's own memory and the the contents will be copied to a buffer suitable for use by the display device.</div><div><br></div><div>Alex</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, May 15, 2020 at 12:46 PM IL Ka <<a href="mailto:kazakevichilya@gmail.com">kazakevichilya@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Thank you, Alex.<div><br></div><div>I am not topic starter, just a curious one. This is how it works:</div><div><br></div><div>* AMD card renders some 3D output to some memory region (this card is called "source" by randr)</div><div>* Intel sends it to the output (this card is called "sink")</div><div><br></div><div>By setting "DRI_PRIME=1" you are asking app to use AMD to render.</div><div><br></div><div>Is it correct?</div><div><br></div><div><br></div><div><br></div><div><br></div></div><div id="gmail-m_7974421917490793411DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br> <table style="border-top:1px solid rgb(211,212,222)">
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<td style="width:470px;padding-top:17px;color:rgb(65,66,78);font-size:13px;font-family:Arial,Helvetica,sans-serif;line-height:18px">Без вирусов. <a href="http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail" style="color:rgb(68,83,234)" target="_blank">www.avg.com</a> </td>
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<a href="#m_7974421917490793411_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" height="1"></a></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, May 15, 2020 at 7:16 PM Alex Deucher <<a href="mailto:alexdeucher@gmail.com" target="_blank">alexdeucher@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr">Most modern desktop environments set this up already. All you need to do is set the env var DRI_PRIME=1 when running an app and it will run on the dGPU. Many desktop environments also provide a GUI based option to choose which GPU to run a particular application on.</div><div dir="ltr"><br></div><div>Alex<br></div><div dir="ltr"><br></div><div dir="ltr">On Fri, May 15, 2020 at 8:23 AM IL Ka <<a href="mailto:kazakevichilya@gmail.com" target="_blank">kazakevichilya@gmail.com</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Then what is the right thing to do here?<div>Use AMD only for rendering, but not for the output. Something like:</div><div>$ xrandr --setprovideroffloadsink provider sink</div><div>?</div><div><br></div><div><br></div></div><div id="gmail-m_7974421917490793411gmail-m_2971641462066569585gmail-m_-1550470071674472515DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br> <table style="border-top:1px solid rgb(211,212,222)">
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<td style="width:55px;padding-top:18px"><a href="http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail" target="_blank"><img src="https://ipmcdn.avast.com/images/icons/icon-envelope-tick-green-avg-v1.png" alt="" style="width: 46px; height: 29px;" width="46" height="29"></a></td>
<td style="width:470px;padding-top:17px;color:rgb(65,66,78);font-size:13px;font-family:Arial,Helvetica,sans-serif;line-height:18px">Без вирусов. <a href="http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail" style="color:rgb(68,83,234)" target="_blank">www.avg.com</a> </td>
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<a href="#m_7974421917490793411_m_2971641462066569585_m_-1550470071674472515_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" height="1"></a></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, May 14, 2020 at 9:52 PM Alex Deucher <<a href="mailto:alexdeucher@gmail.com" target="_blank">alexdeucher@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Thu, May 14, 2020 at 2:47 PM IL Ka <<a href="mailto:kazakevichilya@gmail.com" target="_blank">kazakevichilya@gmail.com</a>> wrote:<br>
><br>
> Here is what happened:<br>
>><br>
>> [ 347.043] (WW) RADEON(0): No outputs definitely connected, trying again...<br>
>> [ 347.043] (WW) RADEON(0): Unable to find connected outputs - setting 1024x768 initial framebuffer<br>
>> [ 347.043] (II) RADEON(0): mem size init: gart size :7fbcf000 vram size: s:80000000 visible:fbbe000<br>
><br>
><br>
> It seems that you have 2 video cards: intel (built into CPU I believe) and ATI.<br>
> Intel is connected, not ATI.<br>
><br>
> I think you need to enable ATI video card in your BIOS settings.<br>
> There should be something like "discrete video card" or "on board video card" switch.<br>
<br>
Not possible on this system. The dGPU in question has no display<br>
hardware at all so it cannot drive a display. It can only support<br>
render offload.<br>
<br>
Alex<br>
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