[Bug 83331] radeon: Laptop panel out of sync after dpms standby/suspend/off

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=83331

--- Comment #9 from Klaus Kusche <klaus.kusche at computerix.info> ---
Anything else I can try?
Any debug outputs I could add?

I think we are hunting two different problems:

1.) Why does the internal display crash 
    after a dpms standby/suspend/off?
    This is extremely annoying, because it happens all the time
    while giving my presentations in the lecture halls,
    and with all the students in front of me, 
    blindly fixing things is irritating.

    Without knowing the code, I'd assume that this should be easy to find:
    What's the difference in code paths between "dpms on" and "xrandr
off+auto"?
    "xrandr off+auto" obviously does something more than "dpms on"?
    Couldn't this be simply added to "dpms on", too?
    Note that just "xrandr auto" alone does not fix the crashed display,
    a "xrandr off" is needed first.

2.) Why do the switch from VGA to framebuffer during boot 
    and an "xrandr off+auto" both take ages (> 5 sec)?

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