Sudden blank black screen

[Alex Deucher]

On Fri, Sep 9, 2011 at 1:35 PM, Marty Jack <martyj19 at comcast.net> wrote:
>
>
> On 09/09/2011 01:15 PM, Matthew Monaco wrote:
>> On 09/09/2011 12:46 AM, DarkKnight BrightWarrior wrote:
>>> Hello all,
>>>
>>> I am using kernel 2.6.38 with X Server 1.9.4 with radeon open source driver.
>>>
>>> I am facing a strange issue. I am using DVI Monitor. Sometimes while doing
>>> logout and login the display is lost. Monitor shows a blank black screen and
>>> monitor power led blinks on and off continuously.
>>> And after sometime, on the top left corner of monitor I can see message
>>> "digital" and "analog" alternately displayed.
>>> Any clicks and keyboard shortcuts are not bringing the display back. I can able
>>> to ssh to the system. I checked ps command output and xorg log but I could not
>>> find any differences from a normal logged in system. From ssh session I can see
>>> Xorg and all other process running fine. But srangely, from ssh session If I run
>>>   chvt 2 and chvt 7 the display comes back. I mean switch to other terminal and
>>> coming back to graphics terminal makes the display on. What could be the reason
>>> for this?
>>>
>>>
>>> Thanks
>>> Praveen
>>>
>>>
>>
>> It sounds more like an issue with your display manager. GDM?
>>
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>>
>
> It sounds more like an issue with VT switch or DPMS.  Maybe Alex will respond with what he would like to see for additional information.  There may be a delay because almost all X developers would be at the XDS2011 meeting for the next few days.

File a bug (https://bugs.freedesktop.org) and attach your xorg log and
dmesg output.  I'm not sure why you'd get a blank screen on logout/in.
 Maybe your desktop environment is messing with the displays.

Alex