NACK [S] Re: [SRU][R/S][PATCH 0/1] Fix incorrect boot_display reporting on multi-GPU systems

[Timo Aaltonen]

Aaron Ma via kernel-team kirjoitti 17.7.2026 klo 12.10:
> BugLink: https://bugs.launchpad.net/bugs/2161036
> 
> SRU Justification:
> 
> [Impact]
> On multi-GPU systems, a VGA-compatible device that is not driving the display
> can incorrectly be reported as the primary graphics device through the
> boot_display sysfs attribute.
> 
> [Fix]
> Apply upstream commit 596b3678326d3d1aed7c19423b6746f1ce09688a
> ("x86/video: Only fall back to vga_default_device() without screen info").
> 
> When framebuffer screen information is valid, use it exclusively to identify
> the primary device. Fall back to vga_default_device() only when no framebuffer
> has been set up.
> 
> [Test Plan]
> Boot a multi-GPU system and verify that boot_display identifies only the GPU
> backing the framebuffer. Verify fallback behavior when no framebuffer has
> been initialized.
> 
> [Where problems could occur]
> The change is limited to primary display-device detection in
> arch/x86/video/video-common.c. The main risk is incorrect identification of the
> primary GPU on systems with unusual or incomplete framebuffer information.
> 
> Mario Limonciello (1):
>    x86/video: Only fall back to vga_default_device() without screen info
> 
>   arch/x86/video/video-common.c | 23 ++++++++++++++---------
>   1 file changed, 14 insertions(+), 9 deletions(-)
> 

this is in 7.2rc already

-- 
Timo Aaltonen
Kernel Team
Canonical Ltd.