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


    Joerg



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