Bug 97778

Summary: Screen blanks for 2 seconds
Product: DRI Reporter: Paul Menzel <pmenzel+bugs.freedesktop.org>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED FIXED QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: intel-gfx-bugs, pmenzel+bugs.freedesktop.org
Version: XOrg git   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: SKL i915 features: display/watermark
Attachments:
Description Flags
Output of `dmesg -T` none

Description Paul Menzel 2016-09-12 14:34:14 UTC 
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
Comment 1 Paul Menzel 2016-09-14 09:13:37 UTC 
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.
Comment 2 Paul Menzel 2016-09-14 16:00:32 UTC 
This time I also noticed, that the monitor on screen “menu” showed a connector symbol. I’d assume this means, the monitor was disconnected.
Comment 3 Jani Nikula 2016-09-15 11:02:42 UTC 
See if this series makes a difference:
https://patchwork.freedesktop.org/series/12082/
Comment 4 Rami 2016-09-22 08:43:39 UTC 
Can you try with the last drm-intel-nightly
Comment 5 Paul Menzel 2016-10-27 12:40:09 UTC 
(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.
Comment 6 Jani Saarinen 2016-12-09 10:15:21 UTC 
Is this still exisisting on latest kernel?
Comment 7 Paul Menzel 2016-12-09 10:25:15 UTC 
(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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