Public bug reported:
Setup:
Dell Inspiron e1405 notebook w/ Intel 945GM graphics
Internal monitor: 1440x900 LCD
External monitor: 1650x1080 Samsung 22" LCD, connected by VGA cable
Power management set to blank screen after 5 minutes
Both monitors available via xrandr, but internal monitor is turned off and
external being used as primary
The symptom is that every 2-3 minutes the monitor flickers. It looks as
if it loses horizontal sync for a split second and then goes back to
normal.
Now, normally I would think this was a hardware problem (bad cable,
etc.), but what makes it strange is:
-- It never happens under Gutsy.
-- It doesn't happen under Hardy until _after_ the first time the screen is
blanked by the power management.
-- Once it starts happening, I can make it go away by using xrandr commands to
switch from the external to the internal monitor and back again. Then things
will be fine until the first time the screen blanking kicks in again.
-- (I can also force it to start happening by running 'xset dpms force off' by
hand.)
(Of course, the flicker starts once the screen wakes back up after being
blanked/powered down.)
It seems to me that something different is happening with respect to the
power management that is causing this.
Thanks for taking the time to look at this.
** Affects: xserver-xorg-video-intel (Ubuntu)
Importance: Undecided
Status: New
--
Intermittent monitor flicker after screen blanking in Hardy
https://bugs.launchpad.net/bugs/214787
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