[Bug 111122] 2500U: Graphics corruption on kernel 5.2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111122

--- Comment #25 from andreaskem at web.de ---
Apparently, Lenovo released a new BIOS update for my laptop (Thinkpad E485)
today. The changelog mentions, "Sync IOAPICID in IVRS and APIC ACPI tables
(Linux)." I installed the update and removed both the ivrs_ioapic[32]=00:14.0
flag, as well as the iommu=pt flag from my kernel command line for testing. To
my surprise, the laptop booted just fine and from what I can tell, the
graphical corruption seems to be gone. In the meantime, the kernel and mesa
were updated a few times and I cannot pinpoint what, exactly, fixed my issues.

-> mesa 19.1.5
-> kernel 5.2.10.arch1-1
-> llvm-libs 8.0.1-3

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