[Bug 110574] System hang after screen power saving

[Bug 110574] System hang after screen power saving

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https://bugs.freedesktop.org/show_bug.cgi?id=110574

            Bug ID: 110574
           Summary: System hang after screen power saving
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: number048@gmail.com

Created attachment 144122
  --> https://bugs.freedesktop.org/attachment.cgi?id=144122&action=edit
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"

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[Bug 110574] System hang after screen power saving

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https://bugs.freedesktop.org/show_bug.cgi?id=110574

--- Comment #1 from Joakim <number048@gmail.com> ---
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

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[Bug 110574] System hang after screen power saving

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https://bugs.freedesktop.org/show_bug.cgi?id=110574

--- Comment #2 from Joakim <number048@gmail.com> ---
I forgot to mention that the bug is circumvented if vertical synchronisation is
disabled in the XFCE compositor.

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[Bug 110574] System hang after screen power saving

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https://bugs.freedesktop.org/show_bug.cgi?id=110574

Joakim <number048@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |WONTFIX

--- Comment #3 from Joakim <number048@gmail.com> ---
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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