On Mittwoch, 6. Januar 2021 12:01:03 CET Mykola Krachkovsky wrote:

> Hi,

> First of all, running kernel 5.10.3 has no this issue.

> Second, I have laptop MSI GE62 6QF Apache Pro:

> CPU: Intel i7 6700HQ

> iGPU: Intel HD 530

> (dGPU: NVidia 970M - but it was not used and I've uninstalled proprietary

> drivers to ensure they aren't affecting this case.)

> Internal monitor uses eDP, external - miniDP.

> OS version: openSUSE Tumbleweed x86_64 20210103 (I'll try 04 later, just

> updated, but as no new kernel, I doubt something will change).

> The problem is when running with 5.10.4 and external monitor (mini

> DisplayPort) is plugged, system hangs (in strange way) on X start. I can

> reboot with MagicSysRQ + R.E.I.S.U.B. but other than that system is hanged

> and screens are black (but on). I can't switch to tty. SDDM seems running,

> but no visual, and system behaves very strange. When I try to blindly

> shutdown system in sddm (using power button or Tab x 4 + enter) system

> isn't actually shutting down, but after SysRQ+REISUB it does.

> If miniDP external is unplugged, then X starts without a problem. And in KDE

> Plasma plugging works fine. Haven't tried switching to tty and back yet.

> But if system is powered off while external is plugged — it still hangs. And

> I can't see any problems in system logs (`sudo journalctl -b -<n>`).

> So the question is how to detect this problem and report it properly? I'll

> try to dig logs more, but maybe there is some other way?

> When I've got hang/timeout problem with i915 before, there was error file in

> `/dev` to send it, but this time I don't see logs about that and I'm unsure

> how to extract it (if it was) cause I can't access my system and it'll gone

> after reboot.

> Kernel bisecting is something I'd like to avoid. But is doable if there are

> no other means.

Try

Bye.

Michael.