[Bug 73530] Asus U38N: Black screen with Radeon driver in Linux

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=73530

--- Comment #69 from Nicolas Werner <nicolas.werner@ymail.com> ---
(In reply to Alex Deucher from comment #65)
> *snip*
> 
> In reply to Christian Aßfalg from comment #63)
> > I think / guess that I am having the same issues. I've got the same laptop,
> > running Arch Linux. Mostly, I've been using the proprietary catalyst driver,
> > since I never got the free driver working. The proprietary is working fine.
> > 
> > What is the issue here? You've been playing with timings for the physical
> > link to the internal panel? Is it so frickly? What would you need to fix the
> > issue? How can I help?
> 
> I suggested that it might be a timing issue, and as per comment 54. 
> However, link training is successful so that monitor accepts the parameters
> that the driver proposed, it just sometimes chooses not to light up.  I
> would suggest trying to tweak the link training timing as per comment 54,
> try disabling ss as per comment 6, and finally, try making some slight
> changes to the modeset sequence as per the attached patch.  The patch adds a
> delay before enabling the video stream and additionally calls the enable
> video stream code again in case the monitor didn't quite get the signal the
> first time.  E.g.,
> *snip*

I also have the same problem. (same notebook, so not surprising)

I tried everything you recommended (in comment #65), in order, nothing helps.
Any more suggestions?

Btw, I'm using OpenSUSE, so Kernel 3.16.6.

Also xrandr output is much shorter than the ones posted here, is that normal
when you use modeset=0?

xrandr -q --verbose
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080
default connected primary 1920x1080+0+0 (0x180) normal (normal) 0mm x 0mm
        Identifier: 0x17f
        Timestamp:  7692
        Subpixel:   unknown
        Clones:    
        CRTC:       0
        CRTCs:      0
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                   filter: 
  1920x1080 (0x180) 159.667MHz *current
        h: width  1920 start    0 end    0 total 1920 skew    0 clock  83.16KHz
        v: height 1080 start    0 end    0 total 1080           clock  77.00Hz

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