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.
Hi Dan,
Can you please attach your /var/log/
In case it might be a modeline issue, can you also test if this occurs
when set to any other resolutions? If it can't be reproduced on other
resolutions, it might be a modeline issue, in which case please provide
your exact monitor model id.
Thanks,
Bryce
On Wed, Apr 09, 2008 at 08:38:55PM -0000, Dan McGuirk wrote:
> 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-
> Importance: Undecided
> Status: New
>
> --
> Intermittent monitor flicker after screen blanking in Hardy
> https:/
> You received this bug notification because you are a member of Ubuntu-X,
> which is subscribed to xserver-
>
> Status in Source Package "xserver-
>
> Bug description:
> 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...