[ltp] Display Port / Intel graphics adapter users
Adrian Bastholm
linux-thinkpad@linux-thinkpad.org
Tue, 1 Feb 2011 19:10:27 +0100
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I'm interested in buying a new laptop as well, and probably a T410 or T510.
Since I really *hate* all these small quirks which don't exist in windows,
I'll probably look for a model with the simplest and most compatible > On
Tue, Feb 1, 2011 at 12:39 PM, Damon Lynch <damonlynch@gmail.com> wrote:
>> Hi,
>>
>> I presume other Thinkpad users using the internal Intel video adapter
>> connected to an external monitor via Display Port have run into the same
bug
>> as me - that the external monitor never goes into an energy saving state
>> when the laptop LCD is powered off. At least, this is what I find using
>> Ubuntu. This is most unfortunate. An obvious workaround is to power off
the
>> monitor manually when leaving the desk. But when it is switched on again
>> Gnome *always* reverts to a lowest-common-denominator mirrored display,
>> despite not being in that mode previously. It's difficult to imagine that
>> anyone actually wants to use their laptop with this display setup.
>>
>> If so, and you're interested in having it fixed, please see this bug
report:
>>
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/711093
>>
>> I imagine it would be helpful if users of Thinkpads other than a T400s
could
>> report if the same bug affects them too. This bug has been present in
Ubuntu
>> since at least the time of 10.04, and possibly before.
>>
>
> I think this may be a logic issue in gnome power manager (GPM) rather
> than the driver. If the following commands executed from a terminal
> blank the displays properly:
> sleep 5; xset dpms force off
> then the driver is working correctly. I have similar issues on fedora
> on a w500 with AMD gaphics, so I suspect it's a GPM issue.
>
> Alex
>
>> Damon
>>
>> --
>> http://www.damonlynch.net
>>
> --
> The linux-thinkpad mailing list home page is at:
> http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad
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<p>I'm interested in buying a new laptop as well, and probably a T410 o=
r T510. Since I really *hate* all these small quirks which don't exist =
in windows, I'll probably look for a model with the simplest and most c=
ompatible > On Tue, Feb 1, 2011 at 12:39 PM, Damon Lynch <<a href=3D"=
mailto:damonlynch@gmail.com">damonlynch@gmail.com</a>> wrote:<br>
>> Hi,<br>>><br>>> I presume other Thinkpad users using t=
he internal Intel video adapter<br>>> connected to an external monito=
r via Display Port have run into the same bug<br>>> as me - that the =
external monitor never goes into an energy saving state<br>
>> when the laptop LCD is powered off. At least, this is what I find =
using<br>>> Ubuntu. This is most unfortunate. An obvious workaround i=
s to power off the<br>>> monitor manually when leaving the desk. But =
when it is switched on again<br>
>> Gnome *always* reverts to a lowest-common-denominator mirrored dis=
play,<br>>> despite not being in that mode previously. It's diffi=
cult to imagine that<br>>> anyone actually wants to use their laptop =
with this display setup.<br>
>><br>>> If so, and you're interested in having it fixed, p=
lease see this bug report:<br>>> <a href=3D"https://bugs.launchpad.ne=
t/ubuntu/+source/xserver-xorg-video-intel/+bug/711093">https://bugs.launchp=
ad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/711093</a><br>
>><br>>> I imagine it would be helpful if users of Thinkpads ot=
her than a T400s could<br>>> report if the same bug affects them too.=
This bug has been present in Ubuntu<br>>> since at least the time of=
10.04, and possibly before.<br>
>><br>> <br>> I think this may be a logic issue in gnome power =
manager (GPM) rather<br>> than the driver. If the following commands ex=
ecuted from a terminal<br>> blank the displays properly:<br>> sleep 5=
; xset dpms force off<br>
> then the driver is working correctly. I have similar issues on fedora=
<br>> on a w500 with AMD gaphics, so I suspect it's a GPM issue.<br>=
> <br>> Alex<br>> <br>>> Damon<br>>><br>>> --<br=
>
>> <a href=3D"http://www.damonlynch.net">http://www.damonlynch.net</a=
><br>>><br>> -- <br>> The linux-thinkpad mailing list home page=
is at:<br>> <a href=3D"http://mailman.linux-thinkpad.org/mailman/listin=
fo/linux-thinkpad">http://mailman.linux-thinkpad.org/mailman/listinfo/linux=
-thinkpad</a><br>
</p>
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