** Changed in: linux-oem-5.10 (Ubuntu Focal)
Status: Confirmed => Fix Committed
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https://bugs.launchpad.net/bugs/1926792
Title:
Fix kernel panic at boot on dual GFX systems
Status in HWE Next:
New
Status in linux package in Ubuntu:
Confirmed
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Won't Fix
Status in linux-oem-5.10 source package in Focal:
Fix Committed
Status in linux source package in Hirsute:
Fix Committed
Status in linux-oem-5.10 source package in Hirsute:
Invalid
Bug description:
[Impact]
On dual GFX systems, if amdgpu fails to probe a device, vgaarb for
another GFX triggers a NULL pointer dereference and freeze the system.
[Fix]
Defer VGA client registering so resources are handled properly when
amdgpu probe fails.
[Test]
With the patch applied, no more kernel panic when vgaarb is changing the
VGA mode.
[Where problems could occur]
VGA clients won't take effect until a successful probe, so unless there
is very subtle bug in vgaarb or vgaswitcheroo, it's very unlikely to
introduce any regression.
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