AaronMa,
This is the iommu debug: [ 0.000000] AMD-Vi: Using IVHD type 0x11 [ 0.000000] AMD-Vi: device: 00:00.2 cap: 0040 seg: 0 flags: b0 info 0000 [ 0.000000] AMD-Vi: mmio-addr: 00000000fd900000 [ 0.000000] AMD-Vi: DEV_SELECT_RANGE_START devid: 00:01.0 flags: 00 [ 0.000000] AMD-Vi: DEV_RANGE_END devid: ff:1f.6 [ 0.000000] AMD-Vi: DEV_ALIAS_RANGE devid: ff:00.0 flags: 00 devid_to: 00:14.4 [ 0.000000] AMD-Vi: DEV_RANGE_END devid: ff:1f.7 [ 0.000000] AMD-Vi: DEV_SPECIAL(HPET[0]) devid: 00:14.0 [ 0.000000] AMD-Vi: DEV_SPECIAL(IOAPIC[33]) devid: 00:14.0 [ 0.000000] AMD-Vi: DEV_SPECIAL(IOAPIC[34]) devid: 00:00.1 [ 0.000000] [Firmware Bug]: AMD-Vi: No southbridge IOAPIC found I will give you the correct iommu "addresses" after dinner :). -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-firmware in Ubuntu. https://bugs.launchpad.net/bugs/1776563 Title: Acer Aspire A315 ACPI failure on Ubuntu 18.04, kernel hangs, can't load, kernel freeze (AMD Ryzen 5/Radeon/Raven) Status in amd: New Status in Linux: Incomplete Status in linux package in Ubuntu: Confirmed Status in linux-firmware package in Ubuntu: New Bug description: CPU: Ryzen 5 2500U VGA: Radeon 535 Notebook: Acer Aspire A315 This is a brand new notebook on the market with Ryzen 5/Radeon. The default kernel of Ubuntu(18.04) hangs at loading with message: tsc: Refined TSC clocksource calibration: 1996.250 MHz clocksource: tsc: mask: 0xffffffffffffffff max_cycles: (...), max_idle_ns: (...) Soft lockup Using pci=noacpi kernel parameter kernel loads without any problem but my notebook produces more heat than on Win10. If I know right Acer notebooks need ACPI to the correct power management. The same thing happens on mainline 4.17,4.18rc1-2. BIOS upgrade to the latest version: 1.08 hasn't helped This problem has been reported upstream: https://bugzilla.kernel.org/show_bug.cgi?id=200087 The latest correctly working kernel was 4.13.* but the heat problem was present with this too. To manage notifications about this bug go to: https://bugs.launchpad.net/amd/+bug/1776563/+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