[Bug 81850] New: regression with kernel 3.15: suspend to ram make system instable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81850

          Priority: medium
            Bug ID: 81850
          Assignee: xorg-driver-ati at lists.x.org
           Summary: regression with kernel 3.15: suspend to ram make
                    system instable
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: suse at kabelfunk.de
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/Radeon
           Product: xorg

I'm using radeon driver for my Radeon HD 4200 (integrated chipset/laptop). 
=> RS880

Suspend to RAM (s2ram) was working well with kernel 3.14.x
Problem starts with 3.15.
After resuming I have an unstable system. 

symptoms:
- Last 6 pixel lines (botton) on screen are black (even the mouse cursor isn't
drawn)
- playing fullscreen video (vlc) for a very few seconds: black screen but with
cursor, no keyboard actions possible. Freeze.
- switching to console CTRL-ALT-F1: sometimes screen garbage, keyboard is
working. (blind typing)

workaround:
- restart X (init 3 or logout from KDE)
- change screen resolution (with e.g. kscreen). This makes the system stable
until next reboot. Even multiple s2ram/resume cycles won't hurt now.

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