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Random Kernel Panics and Monitor Fails

bluefirex

bluefirex

macrumors member
Original poster
Jun 23, 2015
42
39
Germany
Hey guys,

since I have Yosemite, I noticed strange things happening to me. First, for context, here's my setup:

MacBook Pro 2012
Intel Core i7 2.9 GHz, 8 GB RAM, 2x 1 TB SSD
hooked up to 2 Elgato Thunderbolt Docks with each a monitor connected (1x 2560x1080, 1x 1920x1080)

I have these problems, one rare, one not:

1. (rare) Kernel Panics
Sometimes, out of nowhere, my machine just panics. Most of the time this happens when Chrome is active (so it might be suspect to causing it, if any of you might have evidence for it). Here is a log after it happened today: http://bfx.re/cAvH/Anonymous UUID 1F6AD5208.txt

2. Graphic Anomalies
On average every third standby wakeup that lasted longer than half an hour results in one of the external monitors either being glitched or not turning on at all. Re-plugging won't work (either HDMI or the Docks), only a reboot fixes that until the next glitch. The internal monitors works at all times, no glitches there. Also no glitches, when using only one external monitor. Can't recall having experienced that on Mavericks, too.

I did an Apple Hardware Test which resulted in no errors or damages being found. The longest uptime I ever had on Yosemite without bugs or panics was 10 days straight. The shortest so far (ended in monitor-glitch) was 14 hours. On average, I reach 2-3 days.

What might be causing this?

Notes for the kernel panic log:
com.karios.driver.DuetDisplay was not connected at the time this happened. I use that when mobile only.
 
bluefirex said:
Hey guys,

since I have Yosemite, I noticed strange things happening to me. First, for context, here's my setup:

MacBook Pro 2012
Intel Core i7 2.9 GHz, 8 GB RAM, 2x 1 TB SSD
hooked up to 2 Elgato Thunderbolt Docks with each a monitor connected (1x 2560x1080, 1x 1920x1080)

I have these problems, one rare, one not:

1. (rare) Kernel Panics
Sometimes, out of nowhere, my machine just panics. Most of the time this happens when Chrome is active (so it might be suspect to causing it, if any of you might have evidence for it). Here is a log after it happened today: http://bfx.re/cAvH/Anonymous UUID 1F6AD5208.txt

2. Graphic Anomalies
On average every third standby wakeup that lasted longer than half an hour results in one of the external monitors either being glitched or not turning on at all. Re-plugging won't work (either HDMI or the Docks), only a reboot fixes that until the next glitch. The internal monitors works at all times, no glitches there. Also no glitches, when using only one external monitor. Can't recall having experienced that on Mavericks, too.

I did an Apple Hardware Test which resulted in no errors or damages being found. The longest uptime I ever had on Yosemite without bugs or panics was 10 days straight. The shortest so far (ended in monitor-glitch) was 14 hours. On average, I reach 2-3 days.

What might be causing this?

Notes for the kernel panic log:
com.karios.driver.DuetDisplay was not connected at the time this happened. I use that when mobile only.
Click to expand...

I would suggest that you uninstall virtual box, karios and the logitech drivers. If the kernel panics stop, re-install back them one at a time to see which of them is causing the kernel panics. Also, make sure you install the latest updates for each.
 
Thanks for the reply. Did just that and will be testing results over the next few days. If another panic happens, I'll let you know.

But my second problem with random monitor glitches after a few standbys still exists. Had that today with both monitors (for the first time, usually it's only one monitor going haywire).
 
bluefirex said:
Thanks for the reply. Did just that and will be testing results over the next few days. If another panic happens, I'll let you know.

But my second problem with random monitor glitches after a few standbys still exists. Had that today with both monitors (for the first time, usually it's only one monitor going haywire).
Click to expand...

The graphics glitches could be caused by the Elagato Thunderbolt docks. I would try using a single monitor without using any of the docks first. If the graphics glitches stop then add in one of the docks and see if the glitches happen.
 
A few days passed, here are the results so far:
- No kernel panics at this point. Can't call it safe, though, because I had longer periods without before as well.
- Screen's are working fine when using internal display + 1 external display (doesn't matter if dock or not). Was using both my docks with both screens yesterday and today, the second sreen stopped working again. Here's an excerpt from the console what happens when I restart the monitor:

12.08.15 10:43:06,000 kernel[0]: IOThunderboltSwitch<0xffffff804be10c00>(0x1)::listenerCallback - Thunderbolt HPD packet for route = 0x1 port = 10 unplug = 1
12.08.15 10:43:06,000 kernel[0]: AppleThunderboltDPOutAdapter<0xffffff80475f7800>::hpdStateDetermined - deactivate paths
12.08.15 10:43:07,000 kernel[0]: IOThunderboltSwitch<0xffffff804be10c00>(0x1)::listenerCallback - Thunderbolt HPD packet for route = 0x1 port = 10 unplug = 0
12.08.15 10:43:07,000 kernel[0]: AppleThunderboltDPPathManager<0xffffff8057f8f800>::createPath - path type 0x1: Initial Credits [int=0 src=0 dst=0] NFC Credits [int=14 src=5 dst=14]
12.08.15 10:43:07,000 kernel[0]: AppleThunderboltDPPathManager<0xffffff8057f8f800>::createPath - path type 0x1: Initial Credits [int=0 src=0 dst=0] NFC Credits [int=14 src=5 dst=14]
12.08.15 10:43:07,000 kernel[0]: AppleThunderboltDPPathManager<0xffffff8057f8f800>::createPath - path type 0x2: Initial Credits [int=2 src=2 dst=1] NFC Credits [int=0 src=0 dst=0]
12.08.15 10:43:07,000 kernel[0]: AppleThunderboltDPPathManager<0xffffff8057f8f800>::createPath - path type 0x4: Initial Credits [int=2 src=7 dst=1] NFC Credits [int=0 src=0 dst=0]
12.08.15 10:43:07,100 WindowServer[157]: Received display connect changed for display 0x3f003c
12.08.15 10:43:07,100 WindowServer[157]: Found 1 modes for display 0x003f003c [1, 0]
12.08.15 10:43:07,100 WindowServer[157]: Received display connect changed for display 0x3f003d
12.08.15 10:43:07,100 WindowServer[157]: Found 1 modes for display 0x003f003d [1, 0]
12.08.15 10:43:07,100 WindowServer[157]: Received display connect changed for display 0x1b567c42
12.08.15 10:43:07,102 WindowServer[157]: Found 35 modes for display 0x1b567c42 [35, 0]
12.08.15 10:43:07,116 WindowServer[157]: WSDisplayPipeTransactionEnd returned error e00002be
12.08.15 10:43:07,133 WindowServer[157]: Received display connect changed for display 0x1b5602fb
12.08.15 10:43:07,133 WindowServer[157]: Found 1 modes for display 0x1b5602fb [1, 0]
12.08.15 10:43:07,150 WindowServer[157]: Display 0x1b5602fb changed state to offline
12.08.15 10:43:08,764 WindowServer[157]: Received display connect changed for display 0x3f003c
12.08.15 10:43:08,765 WindowServer[157]: Found 1 modes for display 0x003f003c [1, 0]
12.08.15 10:43:08,765 WindowServer[157]: Received display connect changed for display 0x3f003d
12.08.15 10:43:08,765 WindowServer[157]: Found 1 modes for display 0x003f003d [1, 0]
12.08.15 10:43:08,765 WindowServer[157]: Received display connect changed for display 0x1b567c42
12.08.15 10:43:08,767 WindowServer[157]: Found 35 modes for display 0x1b567c42 [35, 0]
12.08.15 10:43:08,795 WindowServer[157]: Received display connect changed for display 0x3f003f
12.08.15 10:43:08,797 WindowServer[157]: Found 31 modes for display 0x003f003f [31, 0]
12.08.15 10:43:08,797 WindowServer[157]: Display 0x003f003f changed state to online
12.08.15 10:43:08,823 WindowServer[157]: disable_update_timeout: UI updates were forcibly disabled by application "Konsole" for over 1.00 seconds. Server has re-enabled them.
12.08.15 10:43:08,823 WindowServer[157]: disable_update_timeout: UI updates were forcibly disabled by application "OneDrive" for over 1.00 seconds. Server has re-enabled them.
12.08.15 10:43:08,823 WindowServer[157]: disable_update_timeout: UI updates were forcibly disabled by application "Systemeinstellungen" for over 1.00 seconds. Server has re-enabled them.
12.08.15 10:43:08,823 WindowServer[157]: common_reenable_update: UI updates were finally reenabled by application "OneDrive" after 1.67 seconds (server forcibly re-enabled them after 1.67 seconds)
12.08.15 10:43:08,829 WindowServer[157]: common_reenable_update: UI updates were finally reenabled by application "Systemeinstellungen" after 1.67 seconds (server forcibly re-enabled them after 1.67 seconds)
12.08.15 10:43:08,830 WindowServer[157]: common_reenable_update: UI updates were finally reenabled by application "Konsole" after 1.68 seconds (server forcibly re-enabled them after 1.67 seconds)
12.08.15 10:43:08,835 WindowServer[157]: Display 0x1b567c42: GL mask 0x4; bounds (0, 0)[2560 x 1080], 35 modes available
Main, Active, on-line, enabled, boot, OpenGL-accel, Vendor 1e6d, Model 59f1, S/N 0, Unit 2, Rotation 0
UUID 0xee276ca1cda2179f04d84d5cfe5a3513, ColorSpace { 801843789 }
12.08.15 10:43:08,835 WindowServer[157]: GLCompositor: GL renderer id 0x01024400, GL mask 0x0000001f, accelerator 0x000030ab, unit 0, caps QEX|MIPMAP, vram 1024 MB
texture max 16384, viewport max {16384, 16384}, extensions NPOT|GLSL|FLOAT
12.08.15 10:43:08,836 WindowServer[157]: Display 0x003f0040: GL mask 0x10; bounds (5504, 0)[1 x 1], 2 modes available
off-line, enabled, OpenGL-accel, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 4, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
12.08.15 10:43:08,836 WindowServer[157]: GLCompositor: GL renderer id 0x01024400, GL mask 0x0000001f, accelerator 0x000030ab, unit 0, caps QEX|MIPMAP, vram 1024 MB
texture max 16384, viewport max {16384, 16384}, extensions NPOT|GLSL|FLOAT
12.08.15 10:43:08,836 WindowServer[157]: Display 0x003f0041: GL mask 0x20; bounds (5505, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 5, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
12.08.15 10:43:08,836 WindowServer[157]: Display 0x003f003d: GL mask 0x2; bounds (5506, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 1, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
12.08.15 10:43:08,836 WindowServer[157]: Display 0x003f003c: GL mask 0x1; bounds (5507, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 0, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff, ColorSpace { 702904714 }
12.08.15 10:43:08,836 WindowServer[157]: Display 0x1b5602fb: GL mask 0x8; bounds (2560, 0)[1920 x 1080], 31 modes available
Active, on-line, enabled, OpenGL-accel, Vendor 1e6d, Model 586f, S/N 2193a, Unit 3, Rotation 0
UUID 0xed47f2041b1f26454675f5d70e7fcefd, ColorSpace { 133081818 }
12.08.15 10:43:08,836 WindowServer[157]: GLCompositor: GL renderer id 0x01024400, GL mask 0x0000001f, accelerator 0x000030ab, unit 0, caps QEX|MIPMAP, vram 1024 MB
texture max 16384, viewport max {16384, 16384}, extensions NPOT|GLSL|FLOAT
12.08.15 10:43:08,990 WindowServer[157]: Display 0x1b567c42: Unit 2: Startup Mode 2560 x 1080, CGSThirtytwoBitColor, Resolution 1, ioModeID 0x80003000, ioModeDepth 0x0, IOReturn 0x0
12.08.15 10:43:08,990 WindowServer[157]: Display 0x1b5602fb: Unit 3: Startup Mode 1920 x 1080, CGSThirtytwoBitColor, Resolution 1, ioModeID 0x80003000, ioModeDepth 0x0, IOReturn 0x0
12.08.15 10:43:08,990 WindowServer[157]: CGXDisplaysDidReconfigure: Display added
12.08.15 10:43:08,990 WindowServer[157]: CGXDisplaysDidReconfigure: Display removed
12.08.15 10:43:08,999 WindowServer[157]: Display 0x1b567c42: GL mask 0x4; bounds (0, 0)[2560 x 1080], 35 modes available
Main, Active, on-line, enabled, boot, OpenGL-accel, Vendor 1e6d, Model 59f1, S/N 0, Unit 2, Rotation 0
UUID 0xee276ca1cda2179f04d84d5cfe5a3513, ColorSpace { 801843789 }
12.08.15 10:43:08,999 WindowServer[157]: GLCompositor: GL renderer id 0x01024400, GL mask 0x0000001f, accelerator 0x000030ab, unit 0, caps QEX|MIPMAP, vram 1024 MB
texture max 16384, viewport max {16384, 16384}, extensions NPOT|GLSL|FLOAT
12.08.15 10:43:09,000 WindowServer[157]: Display 0x003f0040: GL mask 0x10; bounds (5504, 0)[1 x 1], 2 modes available
off-line, enabled, OpenGL-accel, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 4, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
12.08.15 10:43:09,000 WindowServer[157]: GLCompositor: GL renderer id 0x01024400, GL mask 0x0000001f, accelerator 0x000030ab, unit 0, caps QEX|MIPMAP, vram 1024 MB
texture max 16384, viewport max {16384, 16384}, extensions NPOT|GLSL|FLOAT
12.08.15 10:43:09,000 WindowServer[157]: Display 0x003f0041: GL mask 0x20; bounds (5505, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 5, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
12.08.15 10:43:09,000 WindowServer[157]: Display 0x003f003d: GL mask 0x2; bounds (5506, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 1, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
12.08.15 10:43:09,000 WindowServer[157]: Display 0x003f003c: GL mask 0x1; bounds (5507, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 0, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff, ColorSpace { 702904714 }
12.08.15 10:43:09,000 WindowServer[157]: Display 0x1b5602fb: GL mask 0x8; bounds (2560, 0)[1920 x 1080], 31 modes available
Active, on-line, enabled, OpenGL-accel, Vendor 1e6d, Model 586f, S/N 2193a, Unit 3, Rotation 0
UUID 0xed47f2041b1f26454675f5d70e7fcefd, ColorSpace { 133081818 }
12.08.15 10:43:09,000 WindowServer[157]: GLCompositor: GL renderer id 0x01024400, GL mask 0x0000001f, accelerator 0x000030ab, unit 0, caps QEX|MIPMAP, vram 1024 MB
texture max 16384, viewport max {16384, 16384}, extensions NPOT|GLSL|FLOAT
12.08.15 10:43:09,057 WindowServer[157]: MPAccessSurfaceForDisplayDevice: Set up page flip mode on display 0x1b567c42 device: 0x7fc572f12450 isBackBuffered: 1 numComp: 3 numDisp: 3
12.08.15 10:43:09,104 WindowServer[157]: MPAccessSurfaceForDisplayDevice: Set up page flip mode on display 0x1b5602fb device: 0x7fc572d1bcf0 isBackBuffered: 1 numComp: 3 numDisp: 3
12.08.15 10:43:09,134 WindowServer[157]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
12.08.15 10:43:09,530 mDNSResponder[92]: AwdlD2d AwdlD2dStopBrowsingForKey: '_airplay' Browsing service stopped
12.08.15 10:43:09,531 mDNSResponder[92]: AwdlD2d AwdlD2dStopBrowsingForKey: '_raop' Browsing service stopped
12.08.15 10:43:09,874 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b567c42: Unit 2; ColorProfile { 801843789 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:09,988 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b5602fb: Unit 3; ColorProfile { 133081818 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:10,016 com.apple.AmbientDisplayAgent[381]: AMBD Agent: xpc connection became invalid during event handler
12.08.15 10:43:10,122 mDNSResponder[92]: AwdlD2d AwdlD2dStartBrowsingForKey: '_airplay' Browsing service started
12.08.15 10:43:10,124 mDNSResponder[92]: AwdlD2d AwdlD2dStartBrowsingForKey: '_raop' Browsing service started
12.08.15 10:43:10,174 DMProxy[57084]: AMBD Services: connection interrupted: com.apple.AmbientDisplayAgent (Connection interrupted)
12.08.15 10:43:10,192 com.apple.AmbientDisplayAgent[381]: AmbientDisplayAgent started
12.08.15 10:43:10,198 com.apple.AmbientDisplayAgent[381]: AMBD initializing devices
12.08.15 10:43:10,299 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b567c42: Unit 2; ColorProfile { 801843789 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:10,319 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b5602fb: Unit 3; ColorProfile { 133081818 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:10,395 com.apple.AmbientDisplayAgent[381]: AMBD Agent: xpc connection became invalid during event handler
12.08.15 10:43:10,795 WindowServer[157]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
12.08.15 10:43:10,823 WindowServer[157]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
12.08.15 10:43:10,858 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b567c42: Unit 2; ColorProfile { 801843789 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:10,862 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b5602fb: Unit 3; ColorProfile { 133081818 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:10,863 com.apple.AmbientDisplayAgent[381]: AMBD Agent: xpc connection became invalid during event handler
12.08.15 10:43:10,932 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b567c42: Unit 2; ColorProfile { 801843789 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:10,952 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b5602fb: Unit 3; ColorProfile { 133081818 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:10,954 com.apple.AmbientDisplayAgent[381]: AMBD Agent: xpc connection became invalid during event handler
12.08.15 10:43:10,965 DMProxy[57085]: AMBD Services: connection interrupted: com.apple.AmbientDisplayAgent (Connection interrupted)
12.08.15 10:43:10,972 com.apple.AmbientDisplayAgent[381]: AmbientDisplayAgent started
12.08.15 10:43:10,987 com.apple.AmbientDisplayAgent[381]: AMBD initializing devices
12.08.15 10:43:10,990 WindowServer[157]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
12.08.15 10:43:10,996 WindowServer[157]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
12.08.15 10:43:11,007 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b567c42: Unit 2; ColorProfile { 801843789 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:11,016 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b5602fb: Unit 3; ColorProfile { 133081818 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:11,063 com.apple.AmbientDisplayAgent[381]: AMBD Agent: xpc connection became invalid during event handler
12.08.15 10:43:11,076 DMProxy[57086]: AMBD Services: connection interrupted: com.apple.AmbientDisplayAgent (Connection interrupted)
12.08.15 10:43:11,084 com.apple.AmbientDisplayAgent[381]: AmbientDisplayAgent started
12.08.15 10:43:11,087 com.apple.AmbientDisplayAgent[381]: AMBD initializing devices
12.08.15 10:43:11,111 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b567c42: Unit 2; ColorProfile { 801843789 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:11,139 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b5602fb: Unit 3; ColorProfile { 133081818 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:11,169 com.apple.AmbientDisplayAgent[381]: AMBD Agent: xpc connection became invalid during event handler
12.08.15 10:43:11,227 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b567c42: Unit 2; ColorProfile { 801843789 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:11,231 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b5602fb: Unit 3; ColorProfile { 133081818 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:11,232 com.apple.AmbientDisplayAgent[381]: AMBD Agent: xpc connection became invalid during event handler
12.08.15 10:43:11,290 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b567c42: Unit 2; ColorProfile { 801843789 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:11,293 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b5602fb: Unit 3; ColorProfile { 133081818 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:11,294 com.apple.AmbientDisplayAgent[381]: AMBD Agent: xpc connection became invalid during event handler
12.08.15 10:43:11,330 DMProxy[57087]: AMBD Services: connection interrupted: com.apple.AmbientDisplayAgent (Connection interrupted)
12.08.15 10:43:11,338 com.apple.AmbientDisplayAgent[381]: AmbientDisplayAgent started
12.08.15 10:43:11,342 com.apple.AmbientDisplayAgent[381]: AMBD initializing devices
12.08.15 10:43:11,388 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b567c42: Unit 2; ColorProfile { 801843789 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:11,392 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b5602fb: Unit 3; ColorProfile { 133081818 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:11,432 com.apple.AmbientDisplayAgent[381]: AMBD Agent: xpc connection became invalid during event handler
12.08.15 10:43:11,451 DMProxy[57088]: AMBD Services: connection interrupted: com.apple.AmbientDisplayAgent (Connection interrupted)
12.08.15 10:43:11,459 com.apple.AmbientDisplayAgent[381]: AmbientDisplayAgent started
12.08.15 10:43:11,463 com.apple.AmbientDisplayAgent[381]: AMBD initializing devices
12.08.15 10:43:11,499 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b567c42: Unit 2; ColorProfile { 801843789 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:11,516 WindowServer[157]: CGXSetDisplayColorProfileAndTransfer: Display 0x1b5602fb: Unit 3; ColorProfile { 133081818 }; TransferFormula (1.000000, 1.000000, 1.000000)
12.08.15 10:43:11,533 com.apple.AmbientDisplayAgent[381]: AMBD Agent: xpc connection became invalid during event handler

This is what happens:
I woke up from standby, first screen turned on, second screen turned on for a second, then went to standby because of "No signal". Restarting the monitor causes the Mac to re-recognize it but still "No Signal". It is listed in ColorSync and System Preferences but the monitor doesn't get any signal. This isn't the monitors fault as well because sometimes it's the first monitor with this kind of problems. The problem isn't specific to a dock either because both monitors work when used with the internal display and a dock (so internal + 1 external).
 
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