[Bug 61285] No image during bootup with DVI panel

[Gavin Hamill]

Public bug reported:

Binary package hint: linux-image-2.6.15-27-686

I have a 19" Dell 1907FP 'UltraSharp' panel with both VGA+DVI inputs,
and a Radeon X300 graphics card featuring one DVI and one VGA output.

I have cables from each output running to the monitor.

Very simply, if I have the panel in DVI mode, I see no Linux output on
screen during boot between 'Uncompressing Linux...' and the gdm login
screen.  The panel only complains 'Unable to display this mode'. I
cannot use any text console on ALT-Fx

If I switch to analogue input, all is well and I can see the boot
progress, and use text console on ALT-Fx if necessary.

If I add vga=0x314 to the 'kernel' line in /boot/grub/menu.lst then all
is well with both analogue + digital inputs, as well as a 'standard'
[1] 800x600x16 bit display which scrolls quickly.

Ref: http://ubuntuforums.org/showthread.php?p=1505142

What worries me is that having no output will confuse new users who
think the system is broken. Worse still, if there IS a startup problem
(xorg PCIe breakage, anybody?) , a new user connecting only through DVI
will see no error messages, and have no facility to use a text console
on ALT-Fx :(

This is not a new behaviour introduced with the new kernel - only the
new kernel having reset my grub menu.lst to defaults has reminded me to
log this as a bug :)

Cheers,
Gavin.
[1] By standard, I mean the minimum resolution that Windows XP will use for a desktop size.

** Affects: linux-source-2.6.15 (Ubuntu)
     Importance: Untriaged
         Status: Unconfirmed

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No image during bootup with DVI panel
https://launchpad.net/bugs/61285