Created a=
ttachment 145032 [details]
Monitor placement crash/working cutoff
There's an issue with certain desktop environments crashing on startup when=
the
monitors of a multi-display system are in certain positions. In my case, I =
have
two monitors, and my desktop environment crashes with the error=20
cinnamon: ../src/gallium/drivers/radeonsi/si_state_viewport.c:239:
si_emit_guardband: Assertion `left <=3D -1 && top <=3D -1 &am=
p;& right >=3D 1 && bottom
>=3D 1' failed.
when my secondary monitor is positioned to the left of the primary monitor.=
An
example placement can be seen in the attached image. This is roughly the
cutoff; moving the secondary monitor, the Philips, any farther left and
restarting the DE will result in a crash. Keeping it further right and
restarting the DE results in no issues. The secondary monitor can be either
above or below the primary monitor with the same results. This error also
occurs if the secondary monitor is too far left when the DE starts on system
startup. Switching which monitor is the primary and secondary results in the
same issue, with a crash if the new secondary is too far left.
I'm using Linux Mint 19.2, Cinnamon 4.2.3, and kernel version 5.0.0-23-gene=
ric,
though I've tried several different kernel versions. I'm using an RX480. The
issue has been confirmed by others at
https://githu=
b.com/linuxmint/cinnamon/issues/8754 and a very similar and likely
linked issue at https://bugs.launchpad.net/ubuntu/+source/cinnamon/+bug/18=
37087
. glxinfo output can be found at =
https://pastebin.com/RGnAR320 and I'm happy to
provide any other information needed, though I may need some pointers on
something like recompiling Mesa in debug mode and getting a trace stack.