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[BUG] DRI devices are not persistent across reboots and should not be used to identify GPUs #2936

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marmistrz opened this issue May 15, 2020 · 6 comments · May be fixed by #5336
Open

[BUG] DRI devices are not persistent across reboots and should not be used to identify GPUs #2936

marmistrz opened this issue May 15, 2020 · 6 comments · May be fixed by #5336
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Good first issue Linux

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@marmistrz
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@marmistrz marmistrz commented May 15, 2020

Platform

Operating system and version: Arch Linu
OBS Studio version: OBS Studio - 25.0.8-1 (linux)

Expected Behavior

If there are several GPUs available at a host machine (e.g. dual GPU laptops, Intel+AMD/Intel+Nvidia), the same physical GPU should be used for encoding with ffmpeg-vaapi. Currently the same /dev/dri/renderDXXX device is used for encoding instead.

The mapping of physical devices to /dev/dri/renderDXXX is not persistent across reboots, so some other information about the devices should be used to identify it instead.
@marmistrz marmistrz changed the title [BUG] <bug description> [BUG] DRI devices are not persistent across reboots and should not be used to identify GPUs May 15, 2020
@Fenrirthviti
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@Fenrirthviti Fenrirthviti commented May 15, 2020

Do you have a suggestion on what else should be used? Is there a way to consistently identify graphics devices across reboots?
@kkartaltepe
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@kkartaltepe kkartaltepe commented May 15, 2020

Doesnt look like there is any persistent mapping to DRI devices. Maybe the best thing available currently is to identify devices by PCI slot.
@marmistrz
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@marmistrz marmistrz commented May 16, 2020

You can use /dev/dri/by-path/ for instance /dev/dri/by-path/pci-0000:00:02.0-render.
@notr1ch notr1ch added the Linux label May 17, 2020
@kkartaltepe kkartaltepe mentioned this issue May 29, 2020
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@RarogCmex
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@RarogCmex RarogCmex commented Jun 18, 2020

I can confirm it with Intel hd 530/amd radeon rx 560.
@carlocastoldi
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@carlocastoldi carlocastoldi commented Sep 25, 2021

Any intention to work on this? Shouldn't be too difficult to point to /dev/dri/by-path/ rather then /dev/dri/, is it?
combine it with lspci | grep ' VGA ' and we even get the actual name for each of the available cards!
@kkartaltepe
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@kkartaltepe kkartaltepe commented Sep 25, 2021

I dont believe anyone is actively working on it, it is a good issue for anyone wanting to start with contributing though.
@carlocastoldi carlocastoldi linked a pull request that will close this issue Sep 27, 2021
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Labels
Good first issue Linux
7 participants
@kkartaltepe @notr1ch @WizardCM @marmistrz @Fenrirthviti @RarogCmex @carlocastoldi