[Nouveau] Blank screen at startup (conflict with VESA VGA)

[Didier Spaier]

Marcin Slusarz wrote:
> Ok, let's CC nouveau list back.
> 
> On Mon, Apr 12, 2010 at 12:31:58PM +0200, Didier Spaier wrote:
>>>> One thing I didn't check before sending my last mail: can I go back
>>>> to console mode after having started X with say, the nv X module ?
>>>>
>>>> Unfortunately this doesn't work: be it from Fluxbox or KDE, when 
>>>> I logout or use Alt+Ctrl+Fn I see a black screen.
>>> nv or nouveau?
>>> running nv (X) with nouveau kernel module is unsupported
>> Running nv (X).
>>
>> I understand that running nv (X) with nouveau kernel module is unsupported,
>> but if a nVidia GPU is detected the nouveau kernel module is automatically
>> loaded during startup (unless blacklisted, of course).
>>
>> This don't prevent to run X with the nv module (in a distribution in which
>> nouveau (X) is not available, for instance), but going back to console mode
>> doen't work in that case.
>>
>> Is there any way to make it working, as some distributions do not include
>> (yet) all components needed for nouveau (mainly matching libdrm and X module) ?
> 
> I'm not aware of any trick to make both nv and nouveau working.
> Maybe there should be a way to prevent nv (and vesa, but not fbdev) from loading
> when KMS is in use?
> 
Anybody knows one way to do that ?
 >
>>  > nouveau kernel module works only with nouveau and fbdev X drivers
>>
>> I'll will try with fbdev then.
> 
Done, I confirm that there is no problem here to go back and forth (console mode vs X running) with nouveau kernel module and fbdev X module loaded. I tried with Fluxbox, KDE and XFCE.
> 
Didier