The newest Mesa version 19.2.1-1ubuntu1~18.04.1~ppa2 in ppa:ubuntu-x-swat/updates has fixed that problem for me. Thanks!
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mesa in Ubuntu. https://bugs.launchpad.net/bugs/1835622 Title: Cannot start desktop session with compositor enabled Status in Xfwm4: Invalid Status in mesa package in Ubuntu: Confirmed Status in xfwm4 package in Ubuntu: Invalid Bug description: I cannot login to the Xfce desktop session anymore. in ~/.xsession- errors there's the message: xfwm4: ../src/mesa/drivers/dri/i965/intel_mipmap_tree.c:1285: intel_miptree_match_image: Assertion `image->TexObject->Target == mt->target' failed. Earlier today Mesa was upgraded via bionic-updates from 18.2 to 19.0. I'm running Xubuntu 18.04 and I'm also using the Xubuntu Staging PPA with xfwm4 4.13.3 To manage notifications about this bug go to: https://bugs.launchpad.net/xfwm4/+bug/1835622/+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