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While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1988831
and then change the status of the bug to 'Confirmed'.
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the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1988831
Title:
Allow configuring kernel with iommu=igfx_off by default, with cmdline
optional override to igfx_on
Status in linux package in Ubuntu:
Incomplete
Bug description:
[Impact]
* it is desired to have intel_iommu=on by default
* However this is causing many gpu bugs which are resolvable with igfx_off
parameter
* there is no Kconfig that can have intel_iommu=igfx_off behaviour
* introduce intel_iommu=igfx_on kernel command line
* introduce Kconfig that allows to have iommu default igfx_off
* turn both of them on
[Test Plan]
* Test that iommu is on by default
* Test that igfx_off is off by default
* Test that one can turn on GPU iommu with igfx_on
[Where problems could occur]
* Lots of GPU bugs are discovered each time we try to turn IOMMU by default,
hopefully with igfx_off we might have more success in turning iommu on and
keeping it on. See https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1965882
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1971146
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1971699
https://twitter.com/hughsient/status/1564335142243602432
[Other Info]
* Rock & a hard place => our users expect working displays in default kernel
config which IOMMU seems to break a lot.
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