Created attachment 126465 [details] Output of `dmesg -T` Using Linux 4.8-rc5, X.Org X Server 1.18.4, and the X modesetting driver, with a Intel Sky Lake device, using my window manager awesome [1], and change between tags (imagine virtual desktops), the screen blanked for two seconds. ``` $ lspci -nn -s 0:2.0 00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 530 [8086:1912] (rev 06) ``` Linux outputs the following message. ``` [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun ``` I do not know how to reproduce this. Here are the listed information from [2]. ``` $ uname -m x86_64 $ uname -r 4.8.0-rc5.mx64.101 $ dmesg | grep DMI: [ 0.000000] DMI: FUJITSU ESPRIMO_P756/D3401-A1, BIOS V5.0.0.11 R1.13.0 for D3401-A1x 02/19/2016 ``` The monitor is connected over DisplayPort. ``` $ xrandr --verbose Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192 HDMI-1 disconnected (normal left inverted right x axis y axis) Identifier: 0x42 Timestamp: 65432 Subpixel: unknown Clones: CRTCs: 0 1 2 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: aspect ratio: Automatic supported: Automatic, 4:3, 16:9 Broadcast RGB: Automatic supported: Automatic, Full, Limited 16:235 audio: auto supported: force-dvi, off, auto, on DP-1 connected 1920x1080+0+0 (0x4c) normal (normal left inverted right x axis y axis) 698mm x 392mm Identifier: 0x43 Timestamp: 65432 Subpixel: unknown Gamma: 1.0:1.0:1.0 Brightness: 1.0 Clones: HDMI-2 CRTC: 0 CRTCs: 0 1 2 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: EDID: 00ffffffffffff0010ac934050333630 2e170104b54627783a73e0a35336b626 0d5153a54b008100b300d100714fa940 8180d1c00101a36600a0f0701f803020 3500ba882100001a000000ff004b3352 3930334247303633500a000000fc0044 454c4c20555033323134510a000000fd 001d4b1f8c1e000a20202020202001a1 020315b1509005040302071601061112 1513141f2030750030f2705a80b0588a 00ba882100001e023a801871382d4058 2c2500ba882100001e011d8018711c16 20582c2500ba882100009e011d007251 d01e206e285500ba882100001e8c0ad0 8a20e02d10103e9600ba882100001800 00000000000000000000000000000043 Broadcast RGB: Automatic supported: Automatic, Full, Limited 16:235 audio: auto supported: force-dvi, off, auto, on 3840x2160 (0x49) 262.8MHz +HSync -VSync +preferred h: width 3840 start 3888 end 3920 total 4000 skew 0 clock 65.7KHz v: height 2160 start 2163 end 2168 total 2191 clock 30.0Hz 3840x2160 (0x4a) 300.0MHz +HSync +VSync h: width 3840 start 4016 end 4104 total 4400 skew 0 clock 68.2KHz v: height 2160 start 2168 end 2178 total 2250 clock 30.3Hz 1920x1200 (0x4b) 193.2MHz -HSync +VSync h: width 1920 start 2056 end 2256 total 2592 skew 0 clock 74.6KHz v: height 1200 start 1203 end 1209 total 1245 clock 59.9Hz 1920x1080 (0x4c) 148.5MHz +HSync +VSync *current h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.5KHz v: height 1080 start 1082 end 1087 total 1125 clock 60.0Hz 1920x1080 (0x4d) 148.5MHz +HSync +VSync h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.5KHz v: height 1080 start 1084 end 1089 total 1125 clock 60.0Hz 1920x1080 (0x4e) 148.5MHz +HSync +VSync h: width 1920 start 2448 end 2492 total 2640 skew 0 clock 56.2KHz v: height 1080 start 1084 end 1089 total 1125 clock 50.0Hz 1920x1080 (0x4f) 148.4MHz +HSync +VSync h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.4KHz v: height 1080 start 1084 end 1089 total 1125 clock 59.9Hz 1920x1080i (0x50) 74.2MHz +HSync +VSync Interlace h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 33.8KHz v: height 1080 start 1084 end 1094 total 1125 clock 60.1Hz 1920x1080i (0x51) 74.2MHz +HSync +VSync Interlace h: width 1920 start 2448 end 2492 total 2640 skew 0 clock 28.1KHz v: height 1080 start 1084 end 1094 total 1125 clock 50.0Hz 1920x1080 (0x52) 74.2MHz +HSync +VSync h: width 1920 start 2558 end 2602 total 2750 skew 0 clock 27.0KHz v: height 1080 start 1084 end 1089 total 1125 clock 24.0Hz 1920x1080i (0x53) 74.2MHz +HSync +VSync Interlace h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 33.7KHz v: height 1080 start 1084 end 1094 total 1125 clock 60.0Hz 1920x1080 (0x54) 74.2MHz +HSync +VSync h: width 1920 start 2558 end 2602 total 2750 skew 0 clock 27.0KHz v: height 1080 start 1084 end 1089 total 1125 clock 24.0Hz 1600x1200 (0x55) 162.0MHz +HSync +VSync h: width 1600 start 1664 end 1856 total 2160 skew 0 clock 75.0KHz v: height 1200 start 1201 end 1204 total 1250 clock 60.0Hz 1680x1050 (0x56) 146.2MHz -HSync +VSync h: width 1680 start 1784 end 1960 total 2240 skew 0 clock 65.3KHz v: height 1050 start 1053 end 1059 total 1089 clock 60.0Hz 1280x1024 (0x57) 135.0MHz +HSync +VSync h: width 1280 start 1296 end 1440 total 1688 skew 0 clock 80.0KHz v: height 1024 start 1025 end 1028 total 1066 clock 75.0Hz 1280x1024 (0x58) 108.0MHz +HSync +VSync h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 64.0KHz v: height 1024 start 1025 end 1028 total 1066 clock 60.0Hz 1280x800 (0x59) 83.5MHz -HSync +VSync h: width 1280 start 1352 end 1480 total 1680 skew 0 clock 49.7KHz v: height 800 start 803 end 809 total 831 clock 59.8Hz 1152x864 (0x5a) 108.0MHz +HSync +VSync h: width 1152 start 1216 end 1344 total 1600 skew 0 clock 67.5KHz v: height 864 start 865 end 868 total 900 clock 75.0Hz 1280x720 (0x5b) 74.2MHz +HSync +VSync h: width 1280 start 1390 end 1430 total 1650 skew 0 clock 45.0KHz v: height 720 start 725 end 730 total 750 clock 60.0Hz 1280x720 (0x5c) 74.2MHz +HSync +VSync h: width 1280 start 1720 end 1760 total 1980 skew 0 clock 37.5KHz v: height 720 start 725 end 730 total 750 clock 50.0Hz 1280x720 (0x5d) 74.2MHz +HSync +VSync h: width 1280 start 1390 end 1430 total 1650 skew 0 clock 45.0KHz v: height 720 start 725 end 730 total 750 clock 59.9Hz 1024x768 (0x5e) 78.8MHz +HSync +VSync h: width 1024 start 1040 end 1136 total 1312 skew 0 clock 60.0KHz v: height 768 start 769 end 772 total 800 clock 75.0Hz 1024x768 (0x5f) 65.0MHz -HSync -VSync h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.4KHz v: height 768 start 771 end 777 total 806 clock 60.0Hz 800x600 (0x60) 49.5MHz +HSync +VSync h: width 800 start 816 end 896 total 1056 skew 0 clock 46.9KHz v: height 600 start 601 end 604 total 625 clock 75.0Hz 800x600 (0x61) 40.0MHz +HSync +VSync h: width 800 start 840 end 968 total 1056 skew 0 clock 37.9KHz v: height 600 start 601 end 605 total 628 clock 60.3Hz 720x576 (0x62) 27.0MHz -HSync -VSync h: width 720 start 732 end 796 total 864 skew 0 clock 31.2KHz v: height 576 start 581 end 586 total 625 clock 50.0Hz 720x480 (0x63) 27.0MHz -HSync -VSync h: width 720 start 736 end 798 total 858 skew 0 clock 31.5KHz v: height 480 start 489 end 495 total 525 clock 60.0Hz 720x480 (0x64) 27.0MHz -HSync -VSync h: width 720 start 736 end 798 total 858 skew 0 clock 31.5KHz v: height 480 start 489 end 495 total 525 clock 59.9Hz 640x480 (0x65) 31.5MHz -HSync -VSync h: width 640 start 656 end 720 total 840 skew 0 clock 37.5KHz v: height 480 start 481 end 484 total 500 clock 75.0Hz 640x480 (0x66) 25.2MHz -HSync -VSync h: width 640 start 656 end 752 total 800 skew 0 clock 31.5KHz v: height 480 start 490 end 492 total 525 clock 60.0Hz 640x480 (0x67) 25.2MHz -HSync -VSync h: width 640 start 656 end 752 total 800 skew 0 clock 31.5KHz v: height 480 start 490 end 492 total 525 clock 59.9Hz 720x400 (0x68) 28.3MHz -HSync +VSync h: width 720 start 738 end 846 total 900 skew 0 clock 31.5KHz v: height 400 start 412 end 414 total 449 clock 70.1Hz HDMI-2 disconnected (normal left inverted right x axis y axis) Identifier: 0x44 Timestamp: 65432 Subpixel: unknown Clones: DP-1 CRTCs: 0 1 2 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: aspect ratio: Automatic supported: Automatic, 4:3, 16:9 Broadcast RGB: Automatic supported: Automatic, Full, Limited 16:235 audio: auto supported: force-dvi, off, auto, on DP-2 disconnected (normal left inverted right x axis y axis) Identifier: 0x45 Timestamp: 65432 Subpixel: unknown Clones: HDMI-3 CRTCs: 0 1 2 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: Broadcast RGB: Automatic supported: Automatic, Full, Limited 16:235 audio: auto supported: force-dvi, off, auto, on HDMI-3 disconnected (normal left inverted right x axis y axis) Identifier: 0x46 Timestamp: 65432 Subpixel: unknown Clones: DP-2 CRTCs: 0 1 2 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: aspect ratio: Automatic supported: Automatic, 4:3, 16:9 Broadcast RGB: Automatic supported: Automatic, Full, Limited 16:235 audio: auto supported: force-dvi, off, auto, on DP-3 disconnected (normal left inverted right x axis y axis) Identifier: 0x47 Timestamp: 65432 Subpixel: unknown Clones: CRTCs: 0 1 2 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: Broadcast RGB: Automatic supported: Automatic, Full, Limited 16:235 audio: auto supported: force-dvi, off, auto, on ``` Please find the output of `dmesg` attached. Unfortunately, this system hasn’t been started with `drm.debug=0xe` to get more information. [1] https://awesomewm.org/ [2] https://01.org/linuxgraphics/documentation/how-report-bugs
I do not know how to reproduce this, but it happens quite often. The DRM debug level is increased, and these messages are reported by Linux when this happened. ``` [Wed Sep 14 11:09:46 2016] [drm:skl_update_scaler_plane] Updating scaler for [PLANE:23:plane 1A] scaler_user index 0.0 [Wed Sep 14 11:09:46 2016] [drm:skl_wm_flush_pipe] flush pipe A (pass 3) [Wed Sep 14 11:09:46 2016] [drm:skl_update_scaler_plane] Updating scaler for [PLANE:23:plane 1A] scaler_user index 0.0 [Wed Sep 14 11:09:46 2016] [drm:skl_wm_flush_pipe] flush pipe A (pass 3) [Wed Sep 14 11:09:46 2016] [drm:skl_wm_flush_pipe] flush pipe A (pass 3) [Wed Sep 14 11:10:02 2016] [drm:skl_update_scaler_plane] Updating scaler for [PLANE:23:plane 1A] scaler_user index 0.0 [Wed Sep 14 11:10:02 2016] [drm:skl_wm_flush_pipe] flush pipe A (pass 3) [Wed Sep 14 11:10:02 2016] [drm:skl_update_scaler_plane] Updating scaler for [PLANE:23:plane 1A] scaler_user index 0.0 [Wed Sep 14 11:10:02 2016] [drm:skl_wm_flush_pipe] flush pipe A (pass 3) [Wed Sep 14 11:10:02 2016] [drm:skl_wm_flush_pipe] flush pipe A (pass 3) ``` I believe it happened at 11:10:02, though there is unfortunately no difference from the message before.
This time I also noticed, that the monitor on screen “menu” showed a connector symbol. I’d assume this means, the monitor was disconnected.
See if this series makes a difference: https://patchwork.freedesktop.org/series/12082/
Can you try with the last drm-intel-nightly
(In reply to Rami from comment #4) > Can you try with the last drm-intel-nightly I haven’t come around testing this yet. I can just say, that a Dell system with an Intel Skylake device also exhibits this problem. ``` $ lspci -nn 00:00.0 Host bridge [0600]: Intel Corporation Skylake Host Bridge/DRAM Registers [8086:191f] (rev 07) 00:01.0 PCI bridge [0604]: Intel Corporation Skylake PCIe Controller (x16) [8086:1901] (rev 07) ``` This problem is still present in Linux 4.8.4.
Is this still exisisting on latest kernel?
(In reply to Jani Saarinen from comment #6) > Is this still exisisting on latest kernel? I haven’t experienced the problems in a while with release candidates for Linux 4.9. It definitely hasn’t been there with Linux 4.9-rc7 and 4.9-rc8. On the Dell system, the problem isn’t reproducible anymore with Linux 4.8.8.
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