Bug#700598: scrambled/torn display, booting wheezy weekly amd64 CD on L850/046

[Neale Banks <neale@lowendale.com.au>]

On Fri, 15 Feb 2013, Steve McIntyre wrote:

[...]
> Neale, could you try the following for me and tell me what happens
> please? I need you to type the following (blind!) at the corrupt
> display:
> 
>  "c"                         (call up a grub command line)
>  "terminal_output console"   (switch to text-mode output, you should
>                               now get visible text output)

OK, I see a "grub>" prompt

> After that, the following would be useful too:
> 
>  "videoinfo"                 (will print the video capabilities of
>                               your machine)

List of supported video modes:
Legend: P=Packed pixel, D=Direct color, mask/pos=R/G/B/reserved
Adapter 'Cirrus CLGD 5446 PCI Video Driver':
  No info available
Adapter 'Bochs PCI Video Driver':
  No info available
Adapter 'EFI GOP Driver':
  0x000 1366 x  768 x 32  Direct, mask: 8/8/8/8 pos: 16/8/0/24
  0x001  800 x  600 x 32  Direct, mask: 8/8/8/8 pos: 16/8/0/24
  0x002 1024 x  768 x 32  Direct, mask: 8/8/8/8 pos: 16/8/0/24
  0x003  640 x  480 x 32  Direct, mask: 8/8/8/8 pos: 16/8/0/24

>  "set gfxmode=640x480"       (try a different resolution)
>  "terminal_output gfxterm"   (go back to graphic-mode output)

The swirl is a nice sight :-)

>  "<ESC>"                     (go back to the menu, now in 640x480)

We have the Installer menu visible, somewhat stretched on the wide screen
and with minimal controst for the selected item, but usable.

> I'm hoping that the 640x480 mode might work better for you. Whether it
> does or not, the videoinfo output would be very useful if you can note
> that down for me.

Thanks for that.  Let's know if there's any more useful info we can
provide.

Neale.