Public bug reported:
During our test for moorethreads GPU on Ubuntu 20.04 with
lightdm+gnome+xorg desktop environment, we found that it can load DDX
with mtgpu.drv.so, but during screen locking, the lightdm will start a
new Xorg to display a greeter, this new Xorg would match a driver of
modesettings_drv.sio instead of a correctly one mtgpu_drv.so.
After debuging, we found the root cause is that xf86VideoPtrToDriverList
function of Xorg is absent support for moorethreads GPU, there is a
patch to fix this and hope it can be merged to Ubuntu release (20.04 LTS
and following).
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "mt_pci_vendor.patch"
https://bugs.launchpad.net/bugs/2024520/+attachment/5681079/+files/mt_pci_vendor.patch
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https://bugs.launchpad.net/bugs/2024520
Title:
Moorethread GPU driver support on Xorg
Status in xorg package in Ubuntu:
New
Bug description:
During our test for moorethreads GPU on Ubuntu 20.04 with
lightdm+gnome+xorg desktop environment, we found that it can load DDX
with mtgpu.drv.so, but during screen locking, the lightdm will start a
new Xorg to display a greeter, this new Xorg would match a driver of
modesettings_drv.sio instead of a correctly one mtgpu_drv.so.
After debuging, we found the root cause is that
xf86VideoPtrToDriverList function of Xorg is absent support for
moorethreads GPU, there is a patch to fix this and hope it can be
merged to Ubuntu release (20.04 LTS and following).
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/2024520/+subscriptions
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