Public bug reported:
[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.
** Affects: hwe-next
Importance: Undecided
Assignee: AaronMa (mapengyu)
Status: New
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: originate-from-1811752 sutton
** Tags added: originate-from-1811752 sutton
** Changed in: hwe-next
Assignee: (unassigned) => AaronMa (mapengyu)
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https://bugs.launchpad.net/bugs/1812797
Title:
[SRU] Fix Xorg crash with nomodeset when BIOS enable 64-bit fb addr
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