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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 1812797
and then change the status of the bug to 'Confirmed'.
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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/1812797
Title:
[SRU] Fix Xorg crash with nomodeset when BIOS enable 64-bit fb addr
Status in HWE Next:
New
Status in linux package in Ubuntu:
Incomplete
Bug description:
[Impact]
On dual GPU platform, BIOS set frame buffer addr to 64-bit, usually when
CSM=NO setting in BIOS.
When no proper GPU driver loaded, Xorg driver will use the wrong fb addr,
then crash.
[Fix]
Add 64-bit efifb support, make Xorg find the correct GPU fb addr.
If still failed, use the first GPU as default.
[Test]
Tested on Intel and NV dual GPU platform. Works fine.
[Regression Potential]
Upstream fix, low risk.
Verified on ThinkPad P1/P52.
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