[ltp] W500 DisplayPort Intel GMA vs Radeon 3650

Mon, 31 May 2010 21:36:40 +0200

Hi Kartsten,

thank you very much. I definitely will try this vga_switcheroo. I will see if I can find a bleeding edge distro boot cd to see what is going on with 2.6.34 and a more up2date radeon driver. 

Regards,

Marcel

-------- Original-Nachricht --------
> Datum: Mon, 31 May 2010 18:28:55 +0200
> Von: "Karsten KÃ¶nig" <remur@gmx.net>
> An: linux-thinkpad@linux-thinkpad.org
> Betreff: Re: [ltp] W500 DisplayPort Intel GMA vs Radeon 3650

> Am Montag, 31. Mai 2010, 15:57:40 schrieb credito@gmx.de:
> > Hi all,
> > 
> > I have a W500 with two graphic cards. One is the Intel GMA 4500 and the
> > other is a ATI Radeon Mobile 3650. I disabled the ati in bios as I don't
> > need the  extra 3d power.  I'm using Ubuntu 10.04 64bit.
> > 
> > But no I face an issue: I can't get the Intel card working on the
> > displayport. VGA works fine but the image is a bit blurred on high res.
> > xrandr tells me there is an DP1 but nothing is connected.
> > 
> > I googled a bit and it looks like the intel graphic card can't use or is
> > not attached to the displayport. Does anyone of you have any further
> > information on this ?
> 
> I remember seeing the DVI port on the dock only works with the discrete 
> graphics card enabled (T400 that is) and I assume it's the same case for
> the 
> DP output on the W500.
> 
> 
> 
> > What I can tell is if I boot with the intel setup the external monitor
> is
> > pitch black. If I switch to ati card the monitor shows the boot process.
> > So I'm not too confident this can be fixed by software.
> > 
> > Anyway I switched to the opensource radeon driver. This gave my indeed
> what
> > I wanted for a couple of minutes. Then out a sudden (10-15 minutes after
> > normal work) the internal display just got some kind of blurry effect.
> > It's hard to describe. Thin black lines for instance are flickering
> > blueish. The fonts are readable but it appears every 2nd row has some
> sort
> > of misinformation. The background of the console window is not black
> > anymore. For my eye it appears some grey color is added.  And a couple
> of
> > other nasty features. If I power down and start up again it is fine for
> > 5-10 minutes. I suspect this might be a temperature issue. I noticed the
> > GPU has around 60Â° degree Celsius.   Does anyone have an idea what
> happens
> > here ?
> 
> Older radeon driver stack lacked powermanagment
> 
> > Next I decided I try the fglrx (10.5) driver. Well at the moment this
> > blurry feature is gone (GPU is around 45Â°), though I will continue to
> do
> > some long term investigations. Of course now I struggle other problems
> > suspend, switch to console,...
> >
> > I'm a bit scared because of this blurry feature. The laptop is a week
> old.
> > 
> > 
> > Rightnow I'm thinking of how I could get a proper setup. I'd like to use
> > the Ati card only if is absolutely necessary (in my case external
> monitor
> > via displayport). Does anyone of you have a similar setup and maybe a
> > solution for it ?
> 
> The current ATI graphics stack in XOrg, Kernel and Radeon driver is
> getting 
> better, so there is already starting powermanagment etc, I suggest using a
> bleeding edge distribution for now to have the best support, Arch Linux,
> next 
> generation openSUSE or Fedora, maybe update the kernel to 2.6.34 on Fedora
> though.
> 
> > I guess there is no auto switch graphic card utility in linux yet. I'm
> just
> > wondering if it could be switched during boot (grub boot parameter) to
> > pick one graphic card. I just don't know if it is possible to completely
> > shutdown the intel and ati card by linux. Any pointers ?
> > 
> 
> Check out vga_switcheroo from 2.6.34+, your usecase fits perfectly =)
> 
> > Best regards,
> > 
> > Marcel
> 
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