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how to block usage of discrete GPU on macbook pro 8.2

asked 2016-03-23 04:52:20 -0500

rbvt gravatar image

updated 2016-03-24 16:53:29 -0500

hello,i bought used macbook pro 15 unibody 2011 which had an one damaged fan on motherboard i installed fedora 23 and it was working about two days,then started displaying graphic artefacts and finally black screen after seaching some information about this i understand that my discrete gpu radeon hd 6490m is already dead in cause of overheating how could i block in fedora 23 usage of damaged gpu and make it always run on intergrated intel hd graphics?

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answered 2016-03-24 16:07:46 -0500

cmurf gravatar image

You should get it fixed under the recall. I did this recently for mine, and the program goes through the end of this year only.

To disable discrete graphics (radeon) you need to do this in the preboot environment with GRUB. See this bug entry for how to do this. Note that this means external displays will not work as only the discrete GPU supports dual display.

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I confirm that the GRUB solution posted above works well. I have a MacBook Pro 8,2 with Radeon GPU and before the kernel 4.4 the GPU was unusable. So with the outb 0x728... etc trick I was able to work with Fedora on it using only the Intel integrated graphics and with the Radeon off.

cialu gravatar imagecialu ( 2016-03-25 11:30:10 -0500 )edit

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Asked: 2016-03-23 04:52:20 -0500

Seen: 655 times

Last updated: Mar 24 '16