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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,

I have tried with two new kernels from backports and now works.
Kernels names:

linux-image-6.12.32+bpo-amd64    6.12.32-1~bpo12+1
linux-image-6.12.43+deb12-amd64  6.12.43-1~bpo12+1

This R660 will wait some more days before going to production.  Want
me to try more kernels?


Kind regards
Jose M Calhariz


On Mon, Sep 22, 2025 at 06:56:51PM +0100, Jose M Calhariz wrote:
> 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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