I was having problems for some time entailing that an empty screen (or a black screen with one underscore character on top-left) appeared when Ubuntu loaded the graphics driver, in my case nVidia, which made me unable to enter X without the Nouveau driver active. This patch seems to have fixed it.
-- 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: Fix Released Status in xorg-server source package in Focal: Fix Committed 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 -- 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
