** Description changed: [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 Displaylink (udl, evdi) devices. + 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 + 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 -- - 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.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1931547 Title: DisplayLink displays are black after Mesa update Status in X.Org X server: Unknown Status in xorg-server package in Ubuntu: Triaged Status in xorg-server source package in Focal: Confirmed Status in xorg-server source package in Hirsute: Confirmed Status in xorg-server source package in Impish: Triaged 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 -- 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. To manage notifications about this bug go to: https://bugs.launchpad.net/xorg-server/+bug/1931547/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
