Created attachment 144122 [details] dmesg After updating to Xubuntu 19.04 I started having problems with the screen saver feature. After a request for the monitor to go into power saving mode I am unable to recover the system. When the monitor turns on again I get the last image shown but I cannot move the cursor, nothing on the screen is moving, everything is frozen and I cannot use ssh to access the machine. Later I discovered that I could access the computer using ssh before I let the monitor enter power saving mode and I was then able to save a copy of dmesg. As soon as the monitor is turned off by the system the crash happens: [ 2674.166451] general protection fault: 0000 [#1] SMP NOPTI ... [ 2674.166530] RIP: 0010:dce110_vblank_set+0x4f/0xa0 [amdgpu] with the last 5 entries of the call trace: [ 2674.166624] dal_irq_service_set+0x4c/0x90 [amdgpu] [ 2674.166687] dc_interrupt_set+0x24/0x30 [amdgpu] [ 2674.166753] dm_enable_vblank+0x2a/0x40 [amdgpu] [ 2674.166768] drm_vblank_enable+0xe2/0x130 [drm] [ 2674.166781] drm_vblank_get+0x92/0xb0 [drm] I was using the Oibaf PPA both before and after I updated to Xubuntu 19.04. I tried to use the kernel v5.1-rc7 from the Ubuntu mainline: https://kernel.ubuntu.com/~kernel-ppa/mainline/ My linux command line: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.cik_support=0 amdgpu.cik_support=1 amdgpu.dc=1"
My current kernel version in Ubuntu: 5.0.0-13-generic #14-Ubuntu SMP Mon Apr 15 14:59:14 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
I forgot to mention that the bug is circumvented if vertical synchronisation is disabled in the XFCE compositor.
Since newer version of XFCE works differently I can no longer test for this bug as it no longer crashes regardless of which option I use for vertical sync (new glx setting or the old one).
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