could use help debugging black screen on RS780 (xf86-video-ati-6.13.0, radeon)

[Jerome Glisse]

On Wed, Jun 02, 2010 at 10:12:50PM -0700, Larry Doolittle wrote:
> Ross -
> 
> On Wed, Jun 02, 2010 at 12:47:31PM -0400, Ross Vandegrift wrote:
> > On Mon, May 31, 2010 at 09:52:37PM -0700, Larry Doolittle wrote:
> > > ATI 790GX motherboard (Biostar TA790GX XE)
> > > Using either Debian Squeeze (xserver-xorg-video-radeon, built
> > > from xf86-video-ati-6.12.6) or home-built binary built directly
> > > from xf86-video-ati-6.13.0, screens go black when I start the X
> > > server.  I can still change back to a text console, at least if
> > > I use the VGA port.  Using the DVI port, it seems the monitor
> > > gets confused and I need to cycle the computer and/or the monitor
> > > to recover.
> > 
> > Do you have a second computer you could ssh in to the first to restart
> > X from?
> 
> Yes.  Killing X restores the console, but restarting X from any
> location still gives me a black screen.  Even when using the DVI port,
> I can ctrl-alt-F1 back to the console, I just have to be patient
> while the LCD monitor figures out the change in scan rates.
> 
> > I just hit this problem this morning on another computer, this time
> > with an RV380.  Pretty much exactly what you describe - black screen,
> > no flicker, nothing fixed it.  I was not able to switch to a text VT,
> > but that hasn't worked on this box in a long time.
> > 
> > I sshed in from a laptop and restarted X and that fixed it.  This
> > seems new with xserver-xorg-video-radeon 1:6.12.6-1.  Haven't had a
> > chance to try the fixes.
> 
> The only fix I have on my list to try is to use KMS.  A kernel is building
> as I type this.  Are there any radeon driver patches, or even known
> troublesome locations I could start poking at?
> 
> Compiler warnings I see when building xf86-video-ati-6.13.0 on this
> amd64 machine are
> 
> radeon_accel.c: In function ‘RADEONHostDataBlit’:
> radeon_accel.c:855: warning: ‘__expected’ may be used uninitialized in this function
> 
> radeon_atombios.c: In function ‘rhdAtomParseI2CRecord’:
> radeon_atombios.c:1596: warning: initialization from incompatible pointer type
> 
> and a gazillion of the harmless
> 
> atombios_crtc.c: In function ‘atombios_crtc_mode_set’:
> atombios_crtc.c:580: warning: dereferencing pointer ‘adp3_ptr’ does break strict-aliasing rules
> 
>    - Larry
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Please attach full Xorg log. What are the physical connector
on the motherboard ? HDMI+VGA ? How is the monitor connected
DVI through HDMI adapter ?

Cheers,
Jerome