Created attachment 119163 [details] journalctl -b | grep "\[drm" The system is an Intel NUC D34010WYK with an i3 Hasell processor. Monitor 1 is connected via micro HDMI Monitor 2 is connected via mini DisplayPort At boot BIOS, Grub, systemd, all get mirrored on both screens as expected. However, once the login prompt hits, Monitor 2 (DisplayPort) goes blank. It flickers periodically though. When it does flicker on I can see the desktop, any windows that got moved to that monitor and the clock is up to date. The two monitors are exactly the same model, Samsung SyncMaster 204B. I have tried swapping monitors and the issue seems to persist on the mini DisplayPort connection only. I tried this on multiple distributions and they all have the same issue. Ubuntu 15.10, Gnome Ubuntu 15.10, Arch Linux, Fedora 22 which leads me to believe it's likely something in the kernel not the display manager. ----------------- Current System ----------------- Connection: Mini Display Port $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 15.10 Release: 15.10 Codename: wily $ uname -a Linux rnavarro-nuc 4.3.0-994-generic #201510162200 SMP Sat Oct 17 02:02:10 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux $ sudo lshw rnavarro-nuc description: Computer width: 64 bits capabilities: smbios-2.8 vsyscall32 *-core description: Motherboard physical id: 0 *-memory description: System memory physical id: 0 size: 7879MiB *-cpu product: Intel(R) Core(TM) i3-4010U CPU @ 1.70GHz vendor: Intel Corp. physical id: 1 bus info: cpu@0 size: 1700MHz capacity: 1700MHz width: 64 bits capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp x86-64 constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid xsaveopt cpufreq *-pci description: Host bridge product: Haswell-ULT DRAM Controller vendor: Intel Corporation physical id: 100 bus info: pci@0000:00:00.0 version: 09 width: 32 bits clock: 33MHz configuration: driver=hsw_uncore resources: irq:0 *-display description: VGA compatible controller product: Haswell-ULT Integrated Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 09 width: 64 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:45 memory:f7800000-f7bfffff memory:e0000000-efffffff ioport:f000(size=64)
Created attachment 119164 [details] intel_reg_dump
Created attachment 119165 [details] xrandr
Here is a video of the flicker that I'm seeing: https://youtu.be/uQdPnayKIl4
Please add drm.debug=14 module parameter, and attach full dmesg (plain text, not packed) all the way from boot to the problem. Is this a regression, i.e. did it work on some earlier kernel version? If yes, which version?
I'm not entirely sure if this is a regression. I just got this hardware and this is my first time trying this setup on linux. I can try a few older kernels to see if I can find something, but don't feel overly confident. I've attached an updated copy of the dmesg output. I bring up the display manager and reconfigure my second monitor from "off" to "secondary" at: [ 167.615280] [drm:drm_mode_getconnector] [CONNECTOR:37:?] I let if flicker for a bit and then disabled the second monitor back to "off" at: [ 203.763410] [drm:drm_mode_setcrtc] [CRTC:21]
Created attachment 119276 [details] dmesg
Hello, What other information can I get to help debug this?
Hey Guys, I'm still having this issue even after updating kernels to yesterday's nightly. What other information can I get to help debug this?
One more attempt to reach out before giving up.... Come on guys, how can I help fix this? I'm willing to do any legwork possible I'm just not sure what additional information you need.
Thanks for reporting the issue and following up. Are you still seeing this issue? Can you please try the latest drm-intel-nightly kernel?
Timeout - marking resolved+worksforme. Please reopen with the latest dmesg if problem still exists.
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