Bug#438650: xserver-xorg-video-intel: fails to start (No valid modes)

[Brice Goglin <Brice.Goglin@ens-lyon.org>]

Alexander Vodomerov wrote:
> Ok, now I understand. My notebook has an extranl VGA output. I will try
> to connect monitor to it and see whether it changes something.
>   

For the record, what kind of notebook is this?

> (II) intel(0):     ADPA: 0x00000c00 (disabled, pipe A, -hsync, -vsync)
> (II) intel(0):     LVDS: 0x00043011 (disabled, pipe A, 18 bit, 1 channel)
> (II) intel(0):     DVOA: 0x00000000 (disabled, pipe A, no stall, -hsync, -vsync)
> (II) intel(0):     DVOB: 0x00000000 (disabled, pipe A, no stall, -hsync, -vsync)
> (II) intel(0):     DVOC: 0x80004084 (enabled, pipe A, no stall, -hsync, -vsync)
> Maybe ADPA, LVDS, DVOA, DVOB and DVOC are the names for possible outputs?
> Is there any documentation about this?
>   

Hard to say, I am going to forward all this bug in the upstream bugzilla
anyway, the Intel developers will know much more than me. I've been told
that your i845 might be using a panel-subchipset that is not supported
in the intel driver yet. It would explain why your LVDS does (almost)
not appear anywhere in the log.

> I've made exactly as you said. Log is attached to the message.

Thanks a lot.

> Do you have any ideas about debugging info I sent in the later message?
>   

I don't see anything wrong there. If the LVDS subchipset is not
recognized and nothing is plugged in VGA, there is no CRTC available for
the driver, causing what you saw in gdb and in the log. We'll see what
the upstream developers think about all this.

Brice