Created attachment 283033 [details]
dmesg with two monitors
Mainline kernel 5.2.0-rc2
Card Radeon VII
Monitors LG 24UD58-B via DP
When using only one monitor, then everything works fine. But when using two, the system starts to hang and try reset gpu.
Created attachment 283035 [details]
dmesg with one monitor - all fine
There is a bug report about this with more information over at freedesktop.org https://bugs.freedesktop.org/show_bug.cgi?id=110674
It affects 5.1 and 5.2 while 5.0 was fine.
I can confirm this bug, using kernels 5.1 or higher with two DP monitors connected leaves me unable to boot. Disconnecting one monitor makes it work as expected.
If i boot with a single monitor and then plug in the second one after booting the system crashes with graphical corruption.
On older kernels everything works fine.
I have the same monitors as sehellion and can confirm this issue with Radeon VII is still not fixed in 5.3-rc3.
Still not fixed on 5.3-rc6.
Created attachment 284781 [details]
dmesg 5.3-rc7 w/o Two Monitors
Still not fixed on 5.3-rc7. :(
This issue is still not fixed on release 5.3.
Tested as above using Arch Linux.
Progress on this issue has been made here: