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Hi,
I have a HP laptop with an ATI [Radeon HD 7550M/7570M/7650M] hooked up to a docking station with a DisplayPort output to an external monitor.
I am using the two screens, with the external one as primary and I am currently using the opensource driver (latest version of driver, kernel, ...). I tried catalyst-test for a while, but it is cumbersome to update it and I don't need any acceleration or special 3D or opencl functions.
My problem is that after a while the computer blanks the two screens (I want that), but then, when I move the mouse or make any action, only the laptop screen wakes up, not the external monitor.
Sometimes, when I press ctrl+alt+del, the external monitor wakes up and I can login, but I still need to move any opened windows back from the laptop screen to the external monitor. Sometimes, it even doesn't work at all and I have to restart the laptop to redetect the external monitor.
Are there some specials settings to prevent this from happening ?
Thanks.
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Do you get your external monitor back when switching to a VT and back to X? Have you tried switching the external monitor off with xrandr and then back on?
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Yes, I get my monitor back with xrandr off and on and also by switching to a VT and back to X. The only problem is that any fullscreened software on the external monitor doesn't come back to it and stay on the laptop screen.
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A workaround would be to use xrandr off/on after waking up then in /etc/acpi/handler.sh. The other aspect would be a feature/bug of X or related. Try doing the same without compositing manager. If it is not there, then you may workaround this using wmctrl to disable fullscreen mode on applications.
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