https://bugzilla.suse.com/show_bug.cgi?id=1180380 https://bugzilla.suse.com/show_bug.cgi?id=1180380#c2 --- Comment #2 from Jan Kara --- The xorg log looks like everything is fine. The kernel i915 driver shows on resume: [ 312.487879] [drm:intel_mst_pre_enable_dp [i915]] *ERROR* failed to allocate vcpi which may be related to the problem... BTW, this is DELL Latitude E7250 laptop. The problem started happening after updating from Leap 15.0 to Leap 15.2. -- You are receiving this mail because: You are the assignee for the bug.

https://bugzilla.suse.com/show_bug.cgi?id=1180380 https://bugzilla.suse.com/show_bug.cgi?id=1180380#c4 --- Comment #4 from Jan Kara --- Created attachment 844794 --> https://bugzilla.suse.com/attachment.cgi?id=844794&action=edit dmesg with drm.debug=1 -- You are receiving this mail because: You are the assignee for the bug.

https://bugzilla.suse.com/show_bug.cgi?id=1180380 https://bugzilla.suse.com/show_bug.cgi?id=1180380#c6 --- Comment #6 from Jan Kara --- (In reply to Takashi Iwai from comment #3)

Also, is this a regression during Leap 15.2 release?

Well, I know 15.0 (with 4.12-based kernel) worked fine. I'm not sure about 15.1. I didn't have it installed on this machine. I can try booting just the kernel from 15.1 if needed.

And, just to be sure, could you check either SLE15-SP3 kernel-default?

OK, I'll install a kernel from SLE15-SP3 and will let you know. -- You are receiving this mail because: You are the assignee for the bug.

https://bugzilla.suse.com/show_bug.cgi?id=1180380 https://bugzilla.suse.com/show_bug.cgi?id=1180380#c8 --- Comment #8 from Jan Kara --- (In reply to Takashi Iwai from comment #7)

It turned out that SLE15-SP3 kernel contains a 5.11 upstream patch that caused a regression for Intel HDMI, so you might hit another problem with it. Please avoid testing SLE15-SP3 kernel as of now.

OK, thanks for info. -- You are receiving this mail because: You are the assignee for the bug.

https://bugzilla.suse.com/show_bug.cgi?id=1180380 https://bugzilla.suse.com/show_bug.cgi?id=1180380#c14 --- Comment #14 from Jan Kara --- BTW this seems to be some kind of a race because it doesn't happen in 100% of cases. In about 10% of cases the external monitor works just fine after resume. Also it has happened to me already twice over several weeks, that the external monitor didn't come up even after xrandr off - on cycle and I had to reboot the machine. -- You are receiving this mail because: You are the assignee for the bug.

https://bugzilla.suse.com/show_bug.cgi?id=1180380 https://bugzilla.suse.com/show_bug.cgi?id=1180380#c16 Jan Kara changed: What |Removed |Added ---------------------------------------------------------------------------- Version|Leap 15.2 |Leap 15.3 Flags| |needinfo?(jack@suse.com) --- Comment #16 from Jan Kara --- Good question. I have a new laptop now and the old one still has 15.2 installed. I will update it to 15.3 and try it with the external monitor. -- You are receiving this mail because: You are the assignee for the bug.