F17 External Monitor on 945GM

Tue Aug 7 14:57:22 UTC 2012

On Thu, Jul 26, 2012 at 8:23 AM, Philippe LeCavalier <
support at plecavalier.com> wrote:

> On Tue, Jul 24, 2012 at 4:46 PM, David G. Miller <dave at davenjudy.org>wrote:
>
>> Philippe LeCavalier <support <at> plecavalier.com> writes:
>>
>> >
>> >
>> > On Thu, Jul 19, 2012 at 9:14 AM, Philippe LeCavalier <support <at>
>> plecavalier.com> wrote:
>> > Hi Everyone.
>> ...
>> > A yes. The infamous Intel 945 chipset...I waded through the whole
>> sluggish
>> feel issues of the >2048 res issue. Then an update appeared to have
>> addressed
>> all my issues(no idea which one because the one that was supposed to fix
>> it
>> didn't).
>> ...
>> >
>> > So here are the symptoms: if I connect an external monitor(VGA) it
>> won't light
>> up at all. My LCD flickers and comes back to it's original state. Fine.
>> The
>> display settings reflect that one was connected and typically ids it
>> properly.
>> Again, fine. I then set an appropriate resolution and placement for both
>> and hit
>> apply. At this point the screen flickers again and my laptop comes back
>> but the
>> monitor does nothing(orange light). I can however, bring my cursor passed
>> the
>> LCD to where the monitor "is" but it's not lit so no joy there. If I let
>> the
>> time run out on the dialog everything goes back to normal. No harm no
>> foul. If I
>> play with any of the kbd combo keys to force the external monitor
>> gnome-shell
>> freaks out and I'm forced to recover using the console. The only thing I
>> can
>> successfully accomplish is Fn+F5 resulting in the external monitor
>> only-type
>> setup. Recovering from that without restarting X is not possible. If I
>> toggle
>> back to my LCD the screen flickers and spins. Same goes for disconnecting
>> the
>> VGA cable. At this point I can't go back to the monitor either. I have no
>> choice
>> but to open a console and restart Gnome-Shell. The odd time I can't even
>> do that
>> and must power off(ouch! haven't had to do that in Linux for years)
>> >
>>
>> > -- Thanks,
>> > Phil
>> >
>> >
>> Hi Phil -
>>
>> I had some similar problems with FC16 on an HP laptop with the i915 chip
>> set.  X
>> still starts goofy with an external monitor attached but a simple:
>>
>> xrandr --output VGA1 --left-of LVDS1
>>
>> sorts out how much of the display should be on each monitor.
>>
>> The trivial oddity that I have is that, for some reason, this laptop
>> monitor
>> always comes up at zero brightness.  Have you tried adjusting the screen
>> brightness on the laptop once everything is up?  I have to wait until X
>> is up
>> for this to work.  The text output from booting goes to the external
>> monitor and
>> I can pound on the laptop's screen brightness key and nothing happens.
>>  After X
>> starts, it behaves as expected.  This drove me nuts getting FC16 working
>> since
>> there weren't any errors; just no display.
>>
>> I'm running FC16 from a bootable, external hard disk.  The i915 laptop is
>> in my
>> office and I have an older HP laptop with an ATI chipset at home.  I boot
>> the
>> home laptop from the external hard disk and the display is duplicated
>> until X
>> starts and then I get the same slightly goofy overlap I see on my work
>> laptop.
>> A slightly different xrandr (xrandr --output VGA-0 --left-of LVDS) sorts
>> out
>> those displays.
>>
>> A couple of other suggestions are to turn off graphical boot and quiet
>> mode so
>> you can see what's going on as the system boots.  Also, switch to booting
>> in the
>> equivalent to runlevel 3 (multiuser target) and then start X from the
>> command
>> line with startx.
>>
>> Cheers,
>> Dave
>>
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>
> Thanks Dave! your suggestions haven't lead to a solution
> (yet) but I finally, finally found an error msg I can report back...
>
> When I connect the monitor I get this[4] and this[5]. Hopefully this gives
> someone the proverbial light bulb effect. All it tells me is that well, the
> monitor isn't powering on, which I already knew all too well ;) Just to
> reiterate, I can force the external on with the kbd shortcut but the
> results are that I loose my LCD. The goal here is achieving dual display
> and not just external. btw there are more EDID errors just don't know if
> they're relevant or not.
>
> Do we thinks me have enough to post a bug or do me needs more nfo?
>
> filed this[6] today. We'll see what comes form it.

> references(seem to have lost me original refs...anyway):
> [4][drm:intel_lvds_enable] *ERROR* timed out waiting for panel to power on
> [5][drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder
> is 16
>
[6] Bug 846365 <https://bugzilla.redhat.com/show_bug.cgi?id=846365>
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