[Bug 2161036] Re: [SRU] Fix incorrect boot_display reporting on multi-GPU systems

This bug is awaiting verification that the linux/7.0.0-31.31 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-resolute-linux' to 'verification-done-resolute- linux'. If the problem still exists, change the tag 'verification- needed-resolute-linux' to 'verification-failed-resolute-linux'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-resolute-linux-v2 verification-needed-resolute-linux -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2161036 Title: [SRU] Fix incorrect boot_display reporting on multi-GPU systems Status in HWE Next: New Status in linux package in Ubuntu: In Progress Status in linux-oem-6.17 package in Ubuntu: New Status in linux-oem-7.0 package in Ubuntu: New Status in linux source package in Noble: Won't Fix Status in linux-oem-6.17 source package in Noble: Fix Released Status in linux-oem-7.0 source package in Noble: New Status in linux source package in Resolute: In Progress Status in linux-oem-6.17 source package in Resolute: New Status in linux-oem-7.0 source package in Resolute: Fix Committed Status in linux source package in Stonking: In Progress Status in linux-oem-6.17 source package in Stonking: New Status in linux-oem-7.0 source package in Stonking: New Bug description: [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. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/2161036/+subscriptions