[Bug 44851] resume to black screen

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https://bugzilla.kernel.org/show_bug.cgi?id=44851





--- Comment #4 from Peter <energonic@gmail.com>  2012-07-16 13:59:38 ---
Sorry if I've used the wrong terminology. This is a standard iMac.
When I used the AMD proprietary fglrx driver some time ago on ubuntu 11.04 it
showed two display screens detected. The main one is the iMac display and the
other is for the display port to attach an external monitor. Now I use the
radeon kernel driver at boot time and the xf86 fbdev module for X. 
If I do a text-only boot without telling the kernel 'nomodeset', I get a black
screen; but it has booted - I presume the other 'display port' (or 'connector'?
not my main screen) has been chosen for text output.
Assuming I boot with nomodeset then I can start X OK, provided I use the xf86
fbdev driver (the xf86 ati driver just gives me a black screen - but
rebootable, etc). Then I can suspend the system and it goes quiet.
If I then awaken it using a keypress, I can hear it starting up, but the screen
stays black. I can reboot from here with Ctl-Alt-Del. My assumption is that, on
resume, the system tries to run a modeset from the kernel module and decides to
turn off the main screen. I would like to avoid it doing that because
essentially I cannot use suspend/resume.

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