Bug 1576767 Comment 158 Edit History

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Original comment by
on 
My iMac's graphics situation follows. Note that the third display (the 1601W) was added more recently; the problem was occurring before I added it. Which makes me wonder: is it possible this problem only occurs if you have more than one display attached?

Radeon Pro 580:

  Chipset Model:	Radeon Pro 580
  Type:	GPU
  Bus:	PCIe
  PCIe Lane Width:	x16
  VRAM (Total):	8 GB
  Vendor:	AMD (0x1002)
  Device ID:	0x67df
  Revision ID:	0x00c0
  ROM Revision:	113-D000AA-931
  VBIOS Version:	113-D0001A1X-025
  EFI Driver Version:	01.00.931
  Metal:	Supported, feature set macOS GPUFamily2 v1
  Displays:
iMac:
  Display Type:	Built-In Retina LCD
  Resolution:	5120 x 2880 Retina
  Framebuffer Depth:	30-Bit Color (ARGB2101010)
  Main Display:	Yes
  Mirror:	Off
  Online:	Yes
  Automatically Adjust Brightness:	No
  Connection Type:	Internal
DELL U2713H:
  Resolution:	2560 x 1440 (QHD/WQHD - Wide Quad High Definition)
  UI Looks like:	2560 x 1440 @ 59 Hz
  Framebuffer Depth:	30-Bit Color (ARGB2101010)
  Display Serial Number:	C6F0K43P11JL
  Mirror:	Off
  Online:	Yes
  Rotation:	Supported
  Automatically Adjust Brightness:	No
  Connection Type:	DisplayPort
1601W:
  Resolution:	1920 x 1080 (1080p FHD - Full High Definition)
  UI Looks like:	1920 x 1080 @ 60 Hz
  Framebuffer Depth:	30-Bit Color (ARGB2101010)
  Display Serial Number:	MMEK1JA001964
  Mirror:	Off
  Online:	Yes
  Rotation:	Supported
  Automatically Adjust Brightness:	No
  Connection Type:	DisplayPort
Revision 1 by
on 
My iMac's graphics situation follows. Note that the third display (the 1601W) was added more recently; the problem was occurring before I added it. Which makes me wonder: is it possible this problem only occurs if you have more than one display attached?
```
Radeon Pro 580:

  Chipset Model:	Radeon Pro 580
  Type:	GPU
  Bus:	PCIe
  PCIe Lane Width:	x16
  VRAM (Total):	8 GB
  Vendor:	AMD (0x1002)
  Device ID:	0x67df
  Revision ID:	0x00c0
  ROM Revision:	113-D000AA-931
  VBIOS Version:	113-D0001A1X-025
  EFI Driver Version:	01.00.931
  Metal:	Supported, feature set macOS GPUFamily2 v1
  Displays:
iMac:
  Display Type:	Built-In Retina LCD
  Resolution:	5120 x 2880 Retina
  Framebuffer Depth:	30-Bit Color (ARGB2101010)
  Main Display:	Yes
  Mirror:	Off
  Online:	Yes
  Automatically Adjust Brightness:	No
  Connection Type:	Internal
DELL U2713H:
  Resolution:	2560 x 1440 (QHD/WQHD - Wide Quad High Definition)
  UI Looks like:	2560 x 1440 @ 59 Hz
  Framebuffer Depth:	30-Bit Color (ARGB2101010)
  Display Serial Number:	C6F0K43P11JL
  Mirror:	Off
  Online:	Yes
  Rotation:	Supported
  Automatically Adjust Brightness:	No
  Connection Type:	DisplayPort
1601W:
  Resolution:	1920 x 1080 (1080p FHD - Full High Definition)
  UI Looks like:	1920 x 1080 @ 60 Hz
  Framebuffer Depth:	30-Bit Color (ARGB2101010)
  Display Serial Number:	MMEK1JA001964
  Mirror:	Off
  Online:	Yes
  Rotation:	Supported
  Automatically Adjust Brightness:	No
  Connection Type:	DisplayPort
```

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