One AMD GPU detected as two devices

Questions and Answers : GPU applications : One AMD GPU detected as two devices
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Message 1990413 - Posted: 17 Apr 2019, 19:12:34 UTC

Hi,
Probably after AMD driver update couple days ago Boinc detects two devices instead one and compute 2 WU in same time, but I have only one GPU...
Windows device manager shows also only one. Is it known issue?
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Message 1990502 - Posted: 18 Apr 2019, 13:35:49 UTC - in response to Message 1990413.  
Last modified: 18 Apr 2019, 13:36:17 UTC

Hi,
Probably after AMD driver update couple days ago Boinc detects two devices instead one and compute 2 WU in same time, but I have only one GPU...
Windows device manager shows also only one. Is it known issue?


Yes. I have had this issue on two different Windows 10 boxs. One fix that works is to back grade the driver to a lower version. Make sure you do a "custom/clean install" and that might clear up the problem.

My fix definitely works on Windows Nivida boxes. And since the problem seems to be specific to Windows 10, I think my fix might work on an AMD gpu too.

It occurs to me that a "work around" might be to set the gpu# in your app_config.xml file to 2 gpu threads. That might convince your Boinc to only run 1 gpu thread on the gpu. I would try this only if you can't get the driver backgrade to work.

Hope this helps.

Tom
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Message 1993743 - Posted: 14 May 2019, 18:42:45 UTC - in response to Message 1990502.  

I noticed in boinc events that it recognized as two GPU with different OpenCL profile versions (older before driver update and new with last driver)
Reinstall of driver helped. Now only one GPU with last profile version
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Questions and Answers : GPU applications : One AMD GPU detected as two devices


 
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