Boot with "nomodeset" log: [ 0.265606] pci 0000:00:02.0: vgaarb: VGA device added: decodes=io+mem,owns=mem,locks=none [ 0.265606] pci 0000:01:00.0: vgaarb: VGA device added: decodes=io+mem,owns=none,locks=none [ 0.265606] pci 0000:00:02.0: vgaarb: no bridge control possible [ 0.265606] pci 0000:01:00.0: vgaarb: bridge control possible [ 0.265606] pci 0000:00:02.0: vgaarb: setting as boot device [ 0.265606] vgaarb: loaded
[ 1.175090] efifb: probing for efifb [ 1.175102] efifb: framebuffer at 0x4000000000, using 32448k, total 32448k vgaarb set boot device good. ** Tags removed: verification-needed-cosmic ** Tags added: verification-done-cosmic -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1812797 Title: [SRU] Fix Xorg crash with nomodeset when BIOS enable 64-bit fb addr Status in HWE Next: New Status in linux package in Ubuntu: Fix Released Status in linux source package in Bionic: Fix Committed Status in linux source package in Cosmic: Fix Committed Bug description: [Impact] On dual GPU platform, BIOS set frame buffer addr to 64-bit, usually when CSM=NO setting in BIOS. When no proper GPU driver loaded, Xorg driver will use the wrong fb addr, then crash. [Fix] Add 64-bit efifb support, make Xorg find the correct GPU fb addr. If still failed, use the first GPU as default. [Test] Tested on Intel and NV dual GPU platform. Works fine. [Regression Potential] Upstream fix, low risk. Verified on ThinkPad P1/P52. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1812797/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
