[Bug 95058] When monitors sleep, backlights stay on, screen is black, and can't be woke up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95058

            Bug ID: 95058
           Summary: When monitors sleep, backlights stay on, screen is
                    black, and can't be woke up
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: Espionage724 at gmail.com

I use 3 monitors. I leave, come back, and my monitors are on, but all of them
show a black background. Mouse cursor doesn't show, and trying to switch to TTY
doesn't work. Keyboard caps lock light doesn't toggle. REISUB magic keys work
to reboot the system.

I'm using a R9 380 (MSI GAMING 4G) with AMDGPU, a GIGABYTE GA-990FX-Gaming
motherboard, FX-8350, and a 750W Corsair PSU. I'm using Xubuntu 16.04
(4.4.0-21-generic; default kernel) and use padoka-PPA (DRI3, TearFree, sisched,
forcedma).

This has happened only after I got the R9 380 about a week or so ago. I've ran
a Radeon HD 7850 prior to that on the same set-up (only with radeon instead of
amdgpu) and haven't had this happen.

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