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Bug#1091732: linux-image-6.11.10+bpo-amd64: Kernel fail to setup video correctly on server Dell PowerEdge R660

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Hi Salvatore,

I have some servers of this type and in the next weeks I will put two
more in production.  So I will try:

 * Latest kernel from backports for bookworm.
 * If fail, try lastest from unstable,
 * If fail, try with upstream kernel.

Then we talk about bisect the upstream kernel with the previous
knowledge.


On Thu, Sep 18, 2025 at 07:43:53AM +0200, Salvatore Bonaccorso wrote:
> Control: tags -1 + moreinfo
> 
> Hi Jose,
> 
> On Mon, Dec 30, 2024 at 03:53:03PM +0000, Jose M Calhariz wrote:
> > Package: src:linux
> > Version: 6.11.10-1~bpo12+1
> > Severity: normal
> > 
> > I found that this kernel fails to setup the video mode of the display
> > adapter, where a kernel 6.1 seams to work, on a server Dell PowerEdge
> > R660.  The work around is to use mgag200.modeset=0.  This machine is
> > to be used as a server, no graphics, X11 or Wayland, just text console
> > after a boot from UEFI.  But I need iDRAC, BMC from dell or IPMI, to
> > sucessfully export the console of the machine to be managed when SSH
> > fails.
> > 
> > I am open to do more tests or give more information as I understand an
> > R660 may not be available to the Debian Kernel Team.
> 
> Is this something you still can reproduce with current kernels, so
> 6.12.43-1~bpo12+1?
> 
> Can you easily take out the server for maintenance, and so do further
> experiments, assuming you can reproduce it with 6.12.43 based kernel,
> does 6.16.7-1 as well still expose the problem?
> 
> If yes: Can you bisect the changes between 6.1 upstream and 6.11
> upstream to identify the commit which changes things for you? (do you
> need instructions on how to proceed on bisection?).
> 
> Regards,
> Salvatore
> 

Kind regards
Jose M Calhariz


-- 
--
	As utopias sao, muitas vezes, verdades prematuras.
		-- Lamartine

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Bug#1091732: linux-image-6.11.10+bpo-amd64: Kernel fail to setup video correctly on server Dell PowerEdge R660 Salvatore Bonaccorso <carnil@debian.org> - 2025-09-18 07:50 +0200
  Bug#1091732: linux-image-6.11.10+bpo-amd64: Kernel fail to setup video correctly on server Dell PowerEdge R660 Jose M Calhariz <jose.calhariz@tecnico.ulisboa.pt> - 2025-09-22 20:00 +0200
    Bug#1091732: linux-image-6.11.10+bpo-amd64: Kernel fail to setup video correctly on server Dell PowerEdge R660 Jose M Calhariz <jose.calhariz@tecnico.ulisboa.pt> - 2025-09-24 18:30 +0200
      Bug#1091732: linux-image-6.11.10+bpo-amd64: Kernel fail to setup video correctly on server Dell PowerEdge R660 Salvatore Bonaccorso <carnil@debian.org> - 2025-09-24 18:50 +0200

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