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

** Changed in: hwe-next Importance: Undecided => Medium ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Changed in: linux-oem-7.0 (Ubuntu Resolute) Status: New => In Progress ** Changed in: linux (Ubuntu Resolute) Importance: Undecided => Medium ** Changed in: linux-oem-6.17 (Ubuntu) Importance: Undecided => Medium ** Changed in: hwe-next Assignee: (unassigned) => AaronMa (mapengyu) ** Changed in: linux-oem-6.17 (Ubuntu Noble) Status: New => In Progress ** Changed in: linux-oem-7.0 (Ubuntu) Importance: Undecided => Medium ** Changed in: linux (Ubuntu Noble) Status: New => Won't Fix ** Changed in: linux-oem-6.17 (Ubuntu Resolute) Importance: Undecided => Medium ** Changed in: linux-oem-7.0 (Ubuntu Resolute) Importance: Undecided => Medium ** Changed in: linux (Ubuntu Noble) Importance: Undecided => Medium ** Changed in: linux (Ubuntu Resolute) Status: New => In Progress ** Changed in: linux-oem-6.17 (Ubuntu Noble) Importance: Undecided => Medium ** Changed in: linux (Ubuntu Stonking) Status: New => In Progress ** Changed in: linux-oem-7.0 (Ubuntu Noble) Importance: Undecided => Medium -- 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: In Progress 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: In Progress 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