Created attachment 121970 [details] dmesg, kernel 4.4.0 With the openSUSE Tumbleweed update to kernel 4.4, my secondary display went dark. This is on a Sandybridge graphics system (i7-2600K) with an Intel mainboard (DH67CL), the same problem persists with 4.4.1 and 4.5-rc1 kernels from OBS (Kernel:Stable and Kernel:HEAD), while a 4.3.3 from home:tiwai:kernel:4.3 makes the display connected to "HDMI2" (actually the DVI connector) work again fine - the main display on "HDMI1" (HDMI connector of the mainboard) works fine with all those kernel variants. I'm attaching dmesg and xrandr --verbose output for both 4.4.0 and 4.3.3 kernels.
Created attachment 121971 [details] dmesg, kernel 4.3.3
Created attachment 121972 [details] xrandr --verbose, kernel 4.4.0
Created attachment 121973 [details] xrandr --verbose, kernel 4.3.3
Created attachment 122007 [details] kernel/DRM syslog messages from drm.debug=0x0e, kernel 4.4.1 As requested in https://bugzilla.opensuse.org/show_bug.cgi?id=968354#c1 I am also attaching a |grep -iE "drm|kernel"| of all syslog messages I got with drm.debug=0x0e on a non-working (4.4.1) as well as the working (4.3.3) kernel.
Created attachment 122008 [details] kernel/DRM syslog messages from drm.debug=0x0e, kernel 4.3.3
I don't want to sound ungrateful, I see flags are being added here, is anyone actually working on this or investigating it? Or should I provide some other data from my system? This currently disrupts my work as I need to run the older 4.3.3 kernel but some modules I'd need are only compiled for current kernels by my distro.
I always was a big fan of Intel, but I guess I'll have to buy a new computer and avoid Intel products there as much as possible, as this is impairing my productivity significantly. Of course, I will also need to talk publicly about how Intel fails to support its products and customers, sadly. I would have preferred to see this bug fixed and everyone be happy, but it's been more than 3 months and I can't afford running into such a show-stopper in the future (and I have to assume that with Intel, you have to expect that happening again).
Actually, I guess I have to apologize for the last comment. I just tried kernel 4.6.1 and the second screen works there! If that's because of an explicit bug fix, would have been nice to get notified in here about that as it's great that it works right now.
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