SUMMARY Akonadi background processes use GPU memory from start to end of akonadi. STEPS TO REPRODUCE 1. Open KMail 2. Close Kmail 3. run nvidia-smi OBSERVED RESULT nvidia-smi reports the following +-----------------------------------------------------------------------------+ | Processes: GPU Memory | | GPU PID Type Process name Usage | |=============================================================================| | 0 4614 G /usr/lib/xorg/Xorg 102MiB | | 0 5519 G /usr/bin/krunner 10MiB | | 0 5528 G /usr/bin/plasmashell 56MiB | | 0 28754 G /usr/bin/akonadi_archivemail_agent 2MiB | | 0 28756 G /usr/bin/akonadi_imap_resource 2MiB | | 0 28757 G /usr/bin/akonadi_imap_resource 2MiB | | 0 28758 G /usr/bin/akonadi_imap_resource 2MiB | | 0 28759 G /usr/bin/akonadi_imap_resource 2MiB | | 0 28760 G /usr/bin/akonadi_imap_resource 2MiB | | 0 28761 G /usr/bin/akonadi_imap_resource 2MiB | | 0 28779 G /usr/bin/akonadi_mailfilter_agent 2MiB | | 0 28788 G /usr/bin/akonadi_sendlater_agent 2MiB | +-----------------------------------------------------------------------------+ EXPECTED RESULT No akonadi_* processes that use GPU memory while running in background. Although I can understand that some processes can be speed up by using the GPU I can't see why there are so many processes from akonadi or why archivemail or mailfilter need it at all. SOFTWARE/OS VERSIONS Linux/KDE Plasma: KUbuntu 18.04.3 (available in About System) KDE Plasma Version: 5.12.9 KDE Frameworks Version: 5.44.0 Qt Version: 5.9.5 ADDITIONAL INFORMATION Running akonadictl stop obviously removes all those akonadi_* processes from the memory reporting.