linux-kernel - Unable to unselect VGA

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Message-ID: <b72ad376-7a42-1ff2-701d-7fb2f3333c64@molgen.mpg.de>
Date:   Tue, 11 Jan 2022 21:28:09 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Unable to unselect VGA_ARB (VGA Arbitration)

Dear Linux folks,


I am using Linux 5.16, and I am unable to unset `VGA_ARB` in Kconfig 
(`make menuconfig`). I have an Asus F2A85-M PRO with an AMD A6-6400K APU 
(integrated Radeon graphics device), so no legacy stuff.

 From `drivers/gpu/vga/Kconfig`:

```
config VGA_ARB
         bool "VGA Arbitration" if EXPERT
         default y
         depends on (PCI && !S390)
         help
           […]

config VGA_ARB_MAX_GPUS
         int "Maximum number of GPUs"
         default 16
         depends on VGA_ARB
         help
           […]

config VGA_SWITCHEROO
         bool "Laptop Hybrid Graphics - GPU switching support"
         depends on X86
         depends on ACPI
         depends on PCI
         depends on (FRAMEBUFFER_CONSOLE=n || FB=y)
         select VGA_ARB
         help
           […]
```

But in `make menuconfig` I am unable to unselect it.

     -*- VGA Arbitration

and the help says:

     Symbol: VGA_ARB [=y]
     Type  : bool
       Depends on: HAS_IOMEM [=y] && PCI [=y] && !S390
       Visible if: HAS_IOMEM [=y] && PCI [=y] && !S390 && EXPERT [=n]
       Location:
         Main menu
          -> Device Drivers
            -> Graphics support
     Selected by [n]:
       - VGA_SWITCHEROO [=n] && HAS_IOMEM [=y] && X86 [=y] && ACPI [=y] 
&& PCI [=y] && (!FRAMEBUFFER_CONSOLE [=y] || FB [=y]=y)

So, VGA_SWITCHEROO is not set, and, therefore, as `Selected by [n]:` 
suggests, I thought I’d be able to deselect it.

It’d be great if you could help me out.


Kind regards,

Paul