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Intel and AMD video conflict

December 30, 2017 — BarryK

I reported yesterday about the result of plugging in my AMD Radeon HD6870 card:


Booting Easy Pyro64 0.6.4 from USB-drive, get a desktop. Fine, but 'glxinfo' reported software rasterising. Also, exit from X to commandline results in a blank screen. Also, under certain conditions, that I have not yet narrowed down, there is a hang at bootup.

My midi-tower PC also has on-board Intel video. There is a file, /etc/modeprobe.d/i915.conf containing this:

options i915 modeset=1

And /etc/modeprobe.d/radeon.conf, both with this:

options radeon modeset=1

I simply removed the i915.conf file, rebooted, and that fixed the exit-from-X-to-commandline, also bootup-to-commandline-no-X., but then I restored i915.conf, and exit-from-X-to-commandline, also bootup-to-commandline-no-X, are still fixed. Hmmm. The UEFI-Setup is showing on-board video as disabled ...the UEFI must have done that automatically? I don't know. There's too much that I don't know here.

This needs more testing, and rerwin's thoughts on this are also very helpful:

I will append to this post as I discover more.

Tags: easy, quirky, linux