I am having the same problems with Ubuntu 19.04, a KDE plasma desktop
and linux-image-5.0.0-3*-generic. I switched to linux-image-
unsigned-5.4.0-050400rc3-generic 13 days ago and haven't had any freezes
so far.
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Bugs, which
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux-signed-hwe (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1841905
Ti