[Bug 98730] On kernel startup, all monitors will go blank and stay blank with newest amd-staging-4.7

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98730

            Bug ID: 98730
           Summary: On kernel startup, all monitors will go blank and stay
                    blank with newest amd-staging-4.7
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: guido-xorgbugs at unknownsite.de

When booting with the newest kernel from the amd-staging-4.7 branch from
https://cgit.freedesktop.org/~agd5f/linux/, all connected monitors will go
blank and stay blank indefinitely. The power indicator on the monitors will
start to blink as if there was no signal.

This is with commit 680da8633ae17cdea8fddd1ede87253325c8ca25. With an older
commit, d330e1e9c232895dbd0c183a647d41d54ecc0884, this branch still works.

DAL is enabled in the config in both cases.

The graphics card is a Sapphire Nitro Radeon R9 380X.

There are three monitors connected in total, one to the DVI-I port, one to the
DVI-D port and one to the DisplayPort.

I am using this particular branch as a workaround for the bug described in
https://bugs.freedesktop.org/show_bug.cgi?id=91202

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