Displaying across 3 monitors with max resolution causes one monitor to enter power-saving mode (HD6870)
Submitted by woo..@..il.com
Assigned to Default DRI bug account
Using arandr, or KDE's RandR manager, I'm trying to adjust my display to stretch across 3 monitors. One of the monitors enters power-saving mode when I try this. Monitors are, from left to right:
DVI-1 (1680x1050 LCD)
DisplayPort-1 (1920x1080 LCD)
DVI-0 (1680x1050 LCD)
Configuring a desktop with all monitors set to their maximum resolution causes one of the two DVI-connected monitors to enter power-saving mode. The mouse cursor will still "disappear" into this monitor as if it were enabled. No error messages appear in either X.org.log or dmesg. It is non-deterministic as to which monitor turns off of the two DVI-connected monitors.
I can configure a desktop with, for example, 1280x1024, 1920x1080, 1280x1024 for resolutions (left to right) and all three monitors will function properly. I cannot use 1680x1050, 1280x1024, 1680x1050, as one of the DVI monitors will enter power saving mode.
I have tested, and this hardware configuration will function with the proprietary fglrx driver, and under Windows, so the card/monitors do not appear at fault.
I have tried the 2.6.38 release candidate kernels, and this feature has never functioned correctly, so I don't think it's a regression.
Asus M4A89/GTD-PRO USB3
DVI-1: LG Flatron W2242TQ
DisplayPort-1: Dell UV22H
DVI-0: ASUS (unknown)
ArchLinux, 64-bit with:
Please let me know if I can provide any additional details. I am willing to apply patches to the kernel or other packages as needed to test.