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

Larry Doolittle larry at
Tue Jun 1 21:55:50 PDT 2010

Alex -

Thanks for taking the time to answer!

On Tue, Jun 01, 2010 at 08:46:56PM -0400, Alex Deucher wrote:
> >> On Mon, May 31, 2010 at 09:52:37PM -0700, Larry Doolittle wrote:
> >> > ... screens go black when I start the X server.
> You might try using the old PLL code:
> Option "NewPLL" "False"
> in the device section of your config.

Doesn't help.

> Do any modes besides 2048x1152 work?


> It's probably also worth trying kms.

It might take me a while to exercise that possibility.
I see decent-looking instructions at
but the stock squeeze kernel doesn't have CONFIG_DRM_RADEON_KMS set.

I posted a copy of my Xorg.log.0 with "NewPLL" "False"

The misspelled "success" in "Blank CRTC 0 succ3ss" is just
me proving to myself that I have my freshly built
in use, and that it's atombios_crtc.c:atombios_blank_crtc()
that claims to be doing the blanking and unblanking.

   - Larry

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