linux-kernel - Simple DRM frame buffer driver not working on Dell desktop with Nvidia card

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Message-ID: <7287c4cc-2ac4-43a7-a60d-466d5299f576@molgen.mpg.de>
Date:   Wed, 16 Aug 2023 18:34:21 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Thomas Zimmermann <tzimmermann@...e.de>,
        Javier Martinez Canillas <javierm@...hat.com>
Cc:     David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Simple DRM frame buffer driver not working on Dell desktop with
 Nvidia card

Dear Linux folks,


On the Dell OptiPlex 7021 with a dedicated Nvidia card, the monitor is 
only connect to that, Linux 6.1.39 does not display any messages, and 
the GRUB messages stay until the X.Org X Server starts.

     Linux version 6.1.39.mx64.450 
(root@...idayincambodia.molgen.mpg.de) (gcc (GCC) 10.4.0, GNU ld (GNU 
Binutils) 2.40) #1 SMP PREEMPT_DYNA
MIC Wed Jul 19 20:07:19 CEST 2023
     […]
     DMI: Dell Inc. OptiPlex 7071/097YXY, BIOS 1.1.2 08/29/2019
     […]
     [drm] Initialized simpledrm 1.0.0 20200625 for simple-framebuffer.0 
on minor 0

I disabled `CONFIG_FB`:

     $ grep -e FB -e SIMPLE /boot/config-6.1.39.mx64.450
     CONFIG_NET_SCH_SFB=m
     CONFIG_SYSFB=y
     CONFIG_SYSFB_SIMPLEFB=y
     # CONFIG_IFB is not set
     CONFIG_DRM_SIMPLEDRM=y
     CONFIG_FB_CMDLINE=y
     # CONFIG_FB is not set
     # CONFIG_USB_SERIAL_SIMPLE is not set
     # CONFIG_CRYPTO_CFB is not set
     # CONFIG_CRYPTO_OFB is not set

The Linux config works on a Dell Precision Tower 3620 with dedicated AMD 
graphics card.

     efifb: probing for efifb
     efifb: framebuffer at 0xa1000000, using 3072k, total 3072k
     efifb: mode is 1024x768x32, linelength=4096, pages=1
     efifb: scrolling: redraw
     efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0

Does Simple DRM FB driver support systems with Nvidia graphics card, or 
do I need to build efifb, and I am mistaken that Simple DRM frame buffer 
driver should replace it.

Please find the Linux messages and configuration attached.


Kind regards,

Paul
View attachment "20230816–dell-optiplex-7071-nvidia.txt" of type "text/plain" (53612 bytes)

View attachment "config-6.1.39.mx64.450" of type "text/plain" (154587 bytes)