[Bug 90987] xorg black screen after monitor power off, AMD r9 270X, aoc u2868pqu, displayport

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90987

Daniel Exner <dex+fdobugzilla at dragonslave.de> changed:

           What    |Removed                     |Added
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                 CC|                            |dex+fdobugzilla at dragonslave
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--- Comment #12 from Daniel Exner <dex+fdobugzilla at dragonslave.de> ---
I can confirm the same effect for R9 270X + Dell U3415W connected via
DisplayPort.

The other monitor (Dell 2007WFP) connected via DVI works fine.

Latest kernel tested: 4.5.0-rc3-00071-g17a5cd3

Don't know if its related but I also see this every boot:

radeon 0000:01:00.0: Invalid PCI ROM header signature: expecting 0xaa55, got
0x8b00

[drm:si_dpm_set_power_state [radeon]] *ERROR*
si_restrict_performance_levels_before_switch failed

Also note that this is the same card as in #76490.

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