I've been working with a Fedora reporter to try and solve the case where pci=nocrs helps to get a working touchpad, see: https://bugzilla.redhat.com/show_bug.cgi?id=1868899
Thanks to the latest set of logs attached there, I now am finally starting to understand what is going on here. Your BIOS claims that any memory between 0x000000004bc50000-0x00000000cfffffff is reserved: [ 0.000000] BIOS-e820: [mem 0x000000004bc50000-0x00000000cfffffff] reserved But then continuous with placing the iomem window for PCI devices inside that reserved range: [ 0.609988] pci_bus 0000:00: root bus resource [mem 0x65400000-0xbfffffff window] This confuses the kernel and makes it unable to assign PCI iomem to devices which have not already been assigned iomem by the BIOS, like the I2C-controller used for the touchpad. If you are interested in / curious about the low level details, I'm discussing this with the kernel PCI developers (including figuring out how to deal with this) here: https://lore.kernel.org/linux-pci/7d80f639-0768-850b-5313-3bdedf0a5...@redhat.com/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1878279 Title: MSFT0004:00 06CB:CD98 Touchpad/trackpad mouse randomly not recognized from any given boot To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1878279/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
