[Bug 94933] [RV610] Freeze when turning on an external monitor after resume from suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94933

            Bug ID: 94933
           Summary: [RV610] Freeze when turning on an external monitor
                    after resume from suspend
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: nicolamori at aol.com

I have a laptop with a Mobility Radeon HD3470 (RV610) and Plasma 5.6.2 as
desktop environment. After suspending to RAM and resuming, I experience a
system freeze when trying to switch to a dual monitor setup using an external
monitor connected to the VGA output. The dual monitor can be turned on without
problems before the suspend/resume cycle.
I don't know which logs/information could be useful to diagnose the problem, so
I will provide it on demand. Thanks.

System details
--------------
VGA: Mobility Radeon HD3470 (RV610)
OS: ArchLinux 64 bit, kernel 4.4.7, xf86-video-ati 7.7.0
Desktop: Plasma 5.6.2 (with KF5 5.21 and Qt 5.6.0)

Steps to reproduce
------------------
- Start the system with only the laptop panel turned on
- Suspend to RAM and then resume
- Connect an external monitor
- Enable the external monitor with xrandr or with the KCM module (System
settings -> Display and Monitor -> Display configuration)

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