** Changed in: xorg-server
Status: Unknown => Fix Released
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https://bugs.launchpad.net/bugs/1931547
Title:
DisplayLink displays are black after Mesa update
Status in X.Org X server:
Fix Released
Status in xorg-server package in Ubuntu:
Fix Released
Status in xorg-server source package in Focal:
Fix Released
Status in xorg-server source package in Hirsute:
Fix Released
Status in xorg-server source package in Impish:
Fix Released
Bug description:
[Impact]
On Mesa versions before 21.0.x glamor_egl_init failed which then (luckily)
disabled reverse_prime_offload_mode. But now with the new Mesa the
GL_RENDERER has changed and glamor_egl_init succeeds and then enables
reverse_prime_offload_mode. This backported commit disables
reverse_prime_offload_mode for good for DisplayLink (udl, evdi) devices.
[Test case]
Update xserver, check that DisplayLink device (udl and/or evdi as
available) works fine.
[Where things could go wrong]
This commit only disables reverse_prime_offload_mode for udl, evdi devices,
other devices will not be affected.
'udl' is used by old USB2 based DisplayLink devices that have a native kernel
driver
'evdi' is used by newer USB3 based devices that use an out-of-tree driver
provided by Displaylink
both need the same change, as they are otherwise similar
at least evdi devices (as found on some laptop docks) have been tested
to work with this
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Please incorporate xorg-server fix for issue:
https://gitlab.freedesktop.org/xorg/xserver/-/issues/1183
It was already merged in to xserver master and xserver-1.20-branch branches.
https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/681
https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/683
This is reported by our users reports on Ubuntu 20.10 with Xserver-1.20.9
and on Ubuntu 21.04 with XServer-1.20.11
If it is required i am willing to help with anything.
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