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: owner-scientific-linux-us...@listserv.fnal.gov > [mailto:owner-scientific-linux-us...@listserv.fnal.gov] On Behalf Of Karel > Lang AFD > Sent: Thursday, December 18, 2014 11:53 AM > To: Jeff McWilliams > Cc: Steven Haigh; scientific-linux-users@fnal.gov > 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 <l...@afd.cz >> <mailto:l...@afd.cz>> 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* >> l...@afd.cz <mailto:l...@afd.cz> | +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: net...@crc.id.au Web: http://www.crc.id.au Phone: (03) 9001 6090 - 0412 935 897
signature.asc
Description: OpenPGP digital signature