I kinda thought this about external monitors too... I could see an
analog VGA cable being lesser quality than DVI, but DVI is digital - as
such there is no quality loss - its either there or not.
If its a 15 pin VGA connector in use, it will get loss at 1600x1200 or
higher resolutions. That's the beauty of DVI / HDMI / DP - they're
purely digital transmission forms.
On 20/12/2014 12:22 AM, James M. Pulver wrote:
> I was pleased installing SL6 on a Lenovo W520. As I said, I just went into the BIOS, and told it to only use the nVidia card, and it all "Just Worked" at that point. I can't speak to nVidia being better than Intel for desktops, I haven't ever seen a difference I can notice (personally, I can't tell) for any VGA to 1920x1080 display based on the card driving it. Now, different Monitors definitely can make a big difference, but that has been independent of the video card in my experience.
>
> --
> James Pulver
> CLASSE Computer Group
> Cornell University
>
>
> -----Original Message-----
> From: [log in to unmask] [mailto:[log in to unmask]] On Behalf Of Karel Lang AFD
> Sent: Thursday, December 18, 2014 11:53 AM
> To: Jeff McWilliams
> Cc: Steven Haigh; [log in to unmask]
> Subject: Re: Optimus / combination graphics
>
> Hi Jeff,
> thanks for a tip :]
>
>
> On 12/18/2014 01:33 PM, Jeff McWilliams wrote:
>> Karel,
>>
>> I'm the development manager for Altair HyperView, a CAE post
>> processing tool. We run into some of these same issues. On the
>> Windows side, NVidia provided us with a method that allows our
>> application to signal that the NVidia graphics should be used on an
>> Optimus laptop, not the Intel graphics. The heuristics that the
>> Optimus driver uses to switch between Intel and NVidia wasn't able to
>> reliably switch to NVidia for our OpenGL app on its own.
>
> HyperView? I know that :] Our CAE/FEM department run mostly ANSA CAE preprocesor with Meta viewer. For CAD we run mostly Catia.
>
> My colleagues, that care about laptop installations also had troubles with Optimus (on windows Catia laptops), that's why i said don't want to buy it for my Linux laptop..
>
>> How are you connecting your laptop to the display? Analog VGA
>> connector? DVI? Displayport? If you have different options, you may
>> want to try switching to see if it improves the output. One of the
>> guys here noticed a big difference when switching between one
>> connector and the other.
>
> My laptop is docked and connected via DVI to HP LP2465 standard
> 1920x1200 external screen, so it should be OK.
>
>> My understanding is that the switching between Intel and NVidia or AMD
>> graphics is driven by the need to reduce power consumption and
>> increase battery life. The integrated Intel graphics consumes less
>> power than the AMD or NVidia chipsets. If you've ever worked with
>> some of the older "mobile workstation" type laptops, those things
>> would get hot sitting in your lap due to all the heat they generated.
>>
>
> I know, the old mobile workstations were beasts, but at least you were sure you get the job done.
> And it really was as the name stated - 'mobile' workstations, so i wouldn't quite characterize it as a standard laptop :]
>
> I know the goal is to prolong the battery life. *Question is, what should be a perfect Linux laptop for Linux sysadmin :]*
>
> cheers,
>
>>
>>
>>
>>
>> On Thu, Dec 18, 2014 at 6:30 AM, Karel Lang AFD <[log in to unmask]
>> <mailto:[log in to unmask]>> wrote:
>>
>> On 12/17/2014 10:35 PM, Steven Haigh wrote:
>>
>> I have to chime in here... Windows support for Optimus and ATI
>> Hybrid
>> Graphics seem to work quiet well. I have a Dell Inspiron with
>> onboard
>> Intel & an ATI card. I haven't been able to fault it.
>>
>>
>> I don't use Optimus myself, so i can not say from my own experience
>> - but if you just use a search engine and look for 'windows optimus
>> troubleshooting' you'll see a good handful of hits.
>>
>> Most of the time when I'm running desktop apps, the Intel on-cpu
>> graphics does everything needed - but when firing up OpenGL or
>> DirectX
>> stuff, the ATI card takes over the panel seemlessly. This is
>> running on
>> Windows 7 - I hear Windows 8 does this even better - but its
>> Windows 8 :\
>>
>>
>> I work for Car design company (meaning CAD apps), we work for all
>> big brands - VW group (Skoda, Volkswagen, Seat ..) Mercedes Benz,
>> BMW - so i'm used to 'see' good VGA cards in work every day.
>> If i take a computer screen that was connected previously to HP
>> workstation with Nvidia Quadro VGA and connect it to laptop with
>> Intel VGA - the difference is *huge* in colors, contrast etc.
>> So for me, Intel VGA is simply no-go, because i know how much better
>> it can be.
>>
>> I don't know where you get this 'bad pictures' part. It'll throw
>> pixels
>> at the screen just as quick as the ATI card for general desktop
>> use. The
>> only real difference is in OpenGL / DirectX where the discrete card
>> kicks in.
>>
>>
>> I don't know where the difference is, but as i said above, it just
>> can not be that simple as "throw pixel at screen" the difference in
>> picture stunning.
>> If i open linux terminal with my favorite 'green on black' and i
>> have it on my laptop with Nvidia Quadro VGA, the picture is sharp,
>> 'eye pleasing' (:D) while on Intel VGA the text conture is more
>> blurry .. etc. It simply is not same.
>>
>> The problem is, Linux support for this is just awful. We can
>> throw blame
>> games all you like, but yeah - it just doesn't work properly. I
>> tried
>> everything from Fedora to Arch to EL6 and nothing was happy to do
>> switching as it should.
>>
>> It isn't the fault of the technology - but the software
>> implementation
>> to use it.
>>
>>
>> It might be, but as said, Intel doesn't cut it for me even on
>> windows, it still is horrible. AMD Radeons are better in 2D.
>>
>> I'm still not sure why you think Intel graphics are ugly. As I said,
>> it'll throw 1920x1080 to a laptop screen all day and hardly be
>> noticed.
>> The only bad part is the linux implementation of switching
>> between cards.
>>
>>
>> Oh, it is noticed - why should i buy laptop with subpar Intel VGA,
>> if there is better VGA vendors.
>> Particularly, why should i buy Optimus and then use 95% time Intel
>> .. blargh! :D :D
>>
>> br, :]
>>
>> --
>> *Karel Lang*
>> *Unix/Linux Administration*
>> [log in to unmask] <mailto:[log in to unmask]> | +420 731 13 40 40
>> <tel:%2B420%20731%2013%2040%2040>
>> AUFEER DESIGN, s.r.o. | www.aufeerdesign.cz
>> <http://www.aufeerdesign.cz>
>>
>
>
--
Steven Haigh
Email: [log in to unmask]
Web: http://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
|
