Re: WARNING: CPU: 4 PID: 863 at include/drm/drm_crtc.h:1577 drm_helper_choose_encoder_dpms+0x88/0x90() - evildoer found and neutralized

From: Joerg Roedel
Date: Wed Sep 30 2015 - 14:07:35 EST

On Wed, Sep 30, 2015 at 07:36:19PM +0200, Borislav Petkov wrote:
> Right, so this fixes the issue on my box, courtesy of Joerg. WE
> basically don't disable the IRQ on MSI-enabled devices. The AMD IOMMU
> uses a barebones PCI device but not a PCI driver, which would be an
> overkill.

Well, not only overkill, but actually harmful. As I just wrote to
Jiang, a device can be forcibly unbound from its driver, which is
something we don't want for the IOMMU.


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