I had "ivrs_ioapic[4]=00:14.0 ivrs_ioapic[5]=00:00.2" on 18.04.03LTS with BIOS v1.13 on A315-41-R909 Just flashed v1.15 and now it boots ok without any extra parameters I share some info from /var/kernel.log
It is better to keep "ivrs_ioapic[4]=00:14.0 ivrs_ioapic[5]=00:00.2" for better performance (see below related Firmware Bug lines)? If someone needs some more logs in order to improve the solution, just ask Thanks in advance In boot without extra parameters, and: -New lines with "Firmware Bug" Aug 16 17:13:20 enrique-Aspire-A315-41 kernel: [ 0.123596] AMD-Vi: [Firmware Bug]: : IOAPIC[4] not in IVRS table Aug 16 17:13:20 enrique-Aspire-A315-41 kernel: [ 0.123598] AMD-Vi: [Firmware Bug]: : IOAPIC[5] not in IVRS table Aug 16 17:13:20 enrique-Aspire-A315-41 kernel: [ 0.123599] AMD-Vi: [Firmware Bug]: : No southbridge IOAPIC found -This line with "Firmware Bug" does not disappear, but it seems not critical (it was booting before and it boots now) Aug 16 17:13:20 enrique-Aspire-A315-41 kernel: [ 0.179342] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored -New line appears (it wasn't before) which shows something new about iommu Aug 16 17:13:20 enrique-Aspire-A315-41 kernel: [ 1.314978] perf/amd_iommu: Detected AMD IOMMU #0 (2 banks, 4 counters/bank). -- 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/1776563 Title: Acer Aspire A315 IOAPIC failure on Ubuntu 18.04, kernel hangs, can't load, kernel freeze (AMD Ryzen 5/Radeon/Raven) / AMDGPU Hybrid crash Status in amd: Fix Released Status in Linux: Fix Released Status in linux package in Ubuntu: Triaged 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
