[mythtv-users] DVI Output During Boot

Ginsu Squirrel ginsu.squirrel at gmail.com
Fri Feb 1 03:50:36 UTC 2008


I enabled framebuffer and I still get no output from the kernel during 
boot and when I switch to a VC from X the screen is blank.  I don't have 
any DVI monitors, just my TV.

David Greaves wrote:
> Ginsu Squirrel wrote:
>   
>> I have my myth box connected to my TV with a DVI to HDMI cable.  I get 
>> no output on the TV until the X server has started (no post, no grub, no 
>> kernel messages).  I have 3 nvidia cards and one ati card.  One nvidia 
>> card, an 8400GS PCI-Express, doesn't have this problem but the other 
>> cards, an nvidia 5200, an nvidia 5500, and an ATI 9600 do.  Has anyone 
>> seen this and is there a way to get output during boot?
>>     
>
> I have seen something similar...
>
> I wonder if your card is sending a signal that the TV can't display (80x25 text).
>
> If you have a DVI monitor you can see if the card is actually displaying during
> POST (I'm sure it is).
>
> If you switch to VT 1 (ctrl-alt-F1) does that display?
>
> If not then you may want to use the framebuffer console (fbcons) and switch
> resolution. My VT's now run at 1920x1280 :)
>
> You will need to alter grub to supply a vga= parameter. It still won't display
> POST but you'll see the boot sooner.
>
> (Nb fbcons also lets you run 'splashy' so you can have a pretty bootup sequence
> - good for a TV PC.)
>
> David
>
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