0 Replies Latest reply: Feb 9, 2011 8:36 AM by john_1620
john_1620 Level 1 (0 points)

I'm experiencing a reliability problem when using a 27in external display on my macbook pro. I used this display at 1920x1080 for a time (on a single-link DVI connector), and then eventually ran it at 2560x1440 with a displayport cable. When running at the higher resolution, I notice some reliability problems:
* Sometimes, when connecting or disconnecting the external monitor, the computer freezes (usually at a screensaver), and requires a hard-reboot, with kernel log errors like "NVDA(OpenGL): Channel timeout!"
* Sometimes, when connecting or disconnecting the external monitor, the graphical desktop restarts, and there is a stack trace starting in the nvidia driver (I don't have it to hand) in the system log
* Sometimes, when exiting a screensaver, web browser windows appear with junk/fragments of other windows rendered in them until I move them.

These are things which happen when running the external monitor at its full resolution, but not when running it at a lower resolution. The display on the macbook itself is always active as well.

I have disabled "Automatic graphics switching" in case that was the problem, but am still having reliability issues.

Am I at the limit of what the graphics chip is capable of? Is it supported to run an external display of this resolution and the internal display at the same time?

I'm using a 2010 macbook pro with the following display configuration:

NVIDIA GeForce GT 330M:

Chipset Model: NVIDIA GeForce GT 330M
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 256 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x0a29
Revision ID: 0x00a2
ROM Revision: 3560
gMux Version: 1.9.21
Color LCD:
Resolution: 1680 x 1050
Pixel Depth: 32-Bit Color (ARGB8888)
Mirror: Off
Online: Yes
Built-In: Yes
DELL U2711:
Resolution: 2560 x 1440 @ 60 Hz
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Connection Type: DisplayPort
Television: Yes

Macbook Pro i5 2.4GHz 8GB,, Mac OS X (10.6.6), 1680x1050 display, with 2560x1440 Dell U2711