Hi, I finally tried the 4.12.2 kernel, and in my case it does not fully work :( I can see a working console, but: - only on my first monitor (DVI) - no x11 (I can see a brief display of xfce4 but immediately turns black and no more display, even if I return to the console.) I think I'm facing 2 different issues. One is about detecting my second monitor (a 4K LG 31MU97 plugged on DP-0 (this display is maybe a bit slow to probe)) The log shows a lot of error concerning this monitor... But I do not see anything on my third output too (HDMI, this is an av receiver, with a full HD tv). No error at all for this one, even the resolution is probed correctly by xorg. The kernel log shows an EDID error for the LG monitor... [ 1.065917] ACPI: Power Button [PWRF] [ 1.066154] Monitor-Mwait will be used to enter C-1 state [ 1.066158] Monitor-Mwait will be used to enter C-2 state [ 1.066161] Monitor-Mwait will be used to enter C-3 state [ 1.067170] ioatdma: Intel(R) QuickData Technology Driver 4.00 [ 1.067386] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled [ 1.067877] Non-volatile memory driver v1.3 [ 1.068132] Linux agpgart interface v0.103 [ 1.068546] nouveau 0000:03:00.0: NVIDIA GM204 (124020a1) [ 1.158533] nouveau 0000:03:00.0: bios: version 84.04.36.00.0b [ 1.158944] nouveau 0000:03:00.0: disp: dcb 15 type 8 unknown [ 1.159616] nouveau 0000:03:00.0: fb: 4096 MiB GDDR5 [ 1.159794] nouveau 0000:03:00.0: bus: MMIO write of 80000159 FAULT at 10eb14 [ IBUS ] [ 1.168074] [TTM] Zone kernel: Available graphics memory: 8214682 kiB [ 1.168244] [TTM] Zone dma32: Available graphics memory: 2097152 kiB [ 1.168410] [TTM] Initializing pool allocator [ 1.168576] [TTM] Initializing DMA pool allocator [ 1.168830] nouveau 0000:03:00.0: DRM: VRAM: 4096 MiB [ 1.168995] nouveau 0000:03:00.0: DRM: GART: 1048576 MiB [ 1.169161] nouveau 0000:03:00.0: DRM: TMDS table version 2.0 [ 1.169327] nouveau 0000:03:00.0: DRM: DCB version 4.1 [ 1.169492] nouveau 0000:03:00.0: DRM: DCB outp 00: 01000f02 00020030 [ 1.169666] nouveau 0000:03:00.0: DRM: DCB outp 01: 02000f00 00000000 [ 1.169838] nouveau 0000:03:00.0: DRM: DCB outp 02: 02811f76 04400020 [ 1.170004] nouveau 0000:03:00.0: DRM: DCB outp 03: 02011f72 00020020 [ 1.170170] nouveau 0000:03:00.0: DRM: DCB outp 04: 04822f86 04400010 [ 1.170337] nouveau 0000:03:00.0: DRM: DCB outp 05: 04022f82 00020010 [ 1.170504] nouveau 0000:03:00.0: DRM: DCB outp 06: 04833f96 04400020 [ 1.170678] nouveau 0000:03:00.0: DRM: DCB outp 07: 04033f92 00020020 [ 1.170848] nouveau 0000:03:00.0: DRM: DCB outp 08: 02044f62 00020010 [ 1.171015] nouveau 0000:03:00.0: DRM: DCB outp 15: 01df5ff8 00000000 [ 1.171181] nouveau 0000:03:00.0: DRM: DCB conn 00: 00001030 [ 1.171347] nouveau 0000:03:00.0: DRM: DCB conn 01: 00020146 [ 1.171511] nouveau 0000:03:00.0: DRM: DCB conn 02: 01000246 [ 1.171684] nouveau 0000:03:00.0: DRM: DCB conn 03: 02000346 [ 1.171853] nouveau 0000:03:00.0: DRM: DCB conn 04: 00010461 [ 1.172018] nouveau 0000:03:00.0: DRM: DCB conn 05: 00000570 [ 1.172183] nouveau 0000:03:00.0: DRM: Pointer to flat panel table invalid [ 1.214711] random: fast init done [ 1.233460] nouveau 0000:03:00.0: DRM: unknown connector type 70 [ 1.233662] nouveau 0000:03:00.0: DRM: failed to create encoder 1/8/0: -19 [ 1.233834] nouveau 0000:03:00.0: DRM: Unknown-1 has no encoders, removing [ 1.234034] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [ 1.234207] [drm] Driver supports precise vblank timestamp query. [ 1.276832] nouveau 0000:03:00.0: hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info(). [ 1.343188] nouveau 0000:03:00.0: DRM: MM: using COPY for buffer copies [ 1.434201] nouveau 0000:03:00.0: DP-1: EDID is invalid: [ 1.434384] [00] BAD 03 12 71 45 10 04 03 01 00 23 09 07 07 83 01 00 [ 1.434568] [00] BAD 00 02 3a 80 18 71 38 2d 40 58 2c 45 00 b8 6f 21 [ 1.434759] [00] BAD 00 00 1e 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 1.434939] [00] BAD 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 1.435121] [00] BAD 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 1.435301] [00] BAD 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 1.435482] [00] BAD 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 1.435670] [00] BAD 00 00 00 00 00 00 00 00 00 00 00 00 00 00 44 00 [ 1.435855] nouveau 0000:03:00.0: DRM: DDC responded, but no EDID for DP-1 [ 1.706882] nouveau 0000:03:00.0: DRM: allocated 1920x1200 fb: 0x60000, bo ffff88041cec5800 [ 1.707396] fbcon: nouveaufb (fb0) is primary device [ 1.798548] nouveau 0000:03:00.0: DRM: DDC responded, but no EDID for DP-1 [ 2.068735] tsc: Refined TSC clocksource calibration: 3197.726 MHz [ 2.068740] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x2e17e64edfb, max_idle_ns: 440795351804 ns [ 2.090622] nouveau 0000:03:00.0: DRM: DDC responded, but no EDID for DP-1 [ 2.481844] Console: switching to colour frame buffer device 200x67 [ 2.501851] nouveau 0000:03:00.0: fb0: nouveaufb frame buffer device [ 2.501864] [drm] Initialized nouveau 1.3.1 20120801 for 0000:03:00.0 on minor 0 When switching to x11, I see the following errors: Jul 22 12:15:40 Quazar kernel: nouveau 0000:03:00.0: DRM: DDC responded, but no EDID for DP-1 Jul 22 12:15:40 Quazar kernel: nouveau 0000:03:00.0: DRM: DDC responded, but no EDID for DP-1 Jul 22 12:15:40 Quazar kernel: nouveau 0000:03:00.0: DRM: DDC responded, but no EDID for DP-1 Jul 22 12:15:42 Quazar kernel: nouveau 0000:03:00.0: DRM: DDC responded, but no EDID for DP-1 Jul 22 12:15:42 Quazar kernel: nouveau 0000:03:00.0: DRM: DDC responded, but no EDID for DP-1 Jul 22 12:15:42 Quazar dbus[4361]: [system] Activating service name='org.freedesktop.UPower' (using servicehelper) Jul 22 12:15:42 Quazar dbus[4361]: [system] Successfully activated service 'org.freedesktop.UPower' Jul 22 12:15:42 Quazar polkitd[4433]: Registered Authentication Agent for unix-session:/org/freedesktop/ConsoleKit/Session1 (system bus name :1.8 [/usr/libexec/polkit-gnome-authentication-agent-1], object path /org/gnome/PolicyKit1/AuthenticationAgent, locale en_US.utf8) Jul 22 12:15:42 Quazar kernel: nouveau 0000:03:00.0: bus: MMIO read of 00000000 FAULT at 61c814 [ IBUS ] Jul 22 12:15:42 Quazar kernel: nouveau 0000:03:00.0: disp: intr24 80000000 Jul 22 12:15:42 Quazar kernel: nouveau 0000:03:00.0: bus: MMIO read of 00000000 FAULT at 61c930 [ IBUS ] Jul 22 12:15:42 Quazar kernel: nouveau 0000:03:00.0: bus: MMIO read of 00000000 FAULT at 61c9b0 [ IBUS ] ....... Jul 22 12:15:42 Quazar kernel: nouveau 0000:03:00.0: bus: MMIO read of 00000000 FAULT at 61c9bc [ IBUS ] Jul 22 12:15:42 Quazar kernel: nouveau 0000:03:00.0: disp: outp 02:0006:0f82: link training failed Jul 22 12:15:42 Quazar kernel: nouveau 0000:03:00.0: bus: MMIO read of 00000000 FAULT at 61c92c [ IBUS ] Jul 22 12:15:44 Quazar kernel: nouveau 0000:03:00.0: DRM: EVO timeout Jul 22 12:15:46 Quazar kernel: nouveau 0000:03:00.0: DRM: EVO timeout Jul 22 12:15:48 Quazar kernel: nouveau 0000:03:00.0: DRM: base-0: timeout Jul 22 12:15:48 Quazar kernel: nouveau 0000:03:00.0: bus: MMIO read of 00000000 FAULT at 690400 [ IBUS TIMEOUT ] Jul 22 12:15:50 Quazar kernel: nouveau 0000:03:00.0: DRM: EVO timeout Jul 22 12:15:52 Quazar kernel: nouveau 0000:03:00.0: DRM: base-1: timeout Jul 22 12:16:05 Quazar kernel: nouveau 0000:03:00.0: DRM: base-0: timeout Jul 22 12:16:05 Quazar kernel: nouveau 0000:03:00.0: DRM: base-1: timeout Jul 22 12:16:05 Quazar kernel: nouveau 0000:03:00.0: DRM: base-0: timeout Jul 22 12:16:05 Quazar kernel: nouveau 0000:03:00.0: DRM: base-1: timeout Jul 22 12:16:05 Quazar kernel: nouveau 0000:03:00.0: DRM: base-0: timeout Jul 22 12:16:05 Quazar kernel: nouveau 0000:03:00.0: DRM: base-1: timeout I can attach all the relevant logs. Any idea? Maybe this belongs to an other bug?