1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking.org

NVIDIA Drops Linux Driver Feature Not Found On Windows

NVIDIA

Published on 01 October 2013 12:53 PM EDT
Written by Michael Larabel in NVIDIA
46 Comments

While the proprietary NVIDIA Windows driver has features not found in the NVIDIA Linux driver, it seems the company will not support Linux-only hardware driver features. At least one feature has been removed from the NVIDIA Linux driver over "feature parity between Windows and Linux."

NVIDIA's Windows and Linux drivers largely consist of common code aside from OS-specific bits, just as NVIDIA's FreeBSD and Solaris drivers are also in close ancestry to the Windows code. With the largely common code-base, NVIDIA has maintained similar features across platforms and at roughly comparable performance levels.

Phoronix reader Antonio Orefice pointed out a little interesting fact of NVIDIA removing a driver feature from their Linux blob over it not being present in the Windows driver. The difference came down to the BaseMosaic mode on Linux used to support more than three monitors (a user reported four monitors working fine for BaseMosaic SLI), but since the NVIDIA 310 Linux driver only three monitors are supported.

A Linux user reported this issue to the NVIDIA DevTalk forum after he had to downgrade his driver to be able to use four monitors with BaseMosaic and not rely upon Xinerama.

In terms of why the latest NVIDIA Linux drivers impose this seemingly artificial limit for the BaseMosaic mode, "sandipt" of NVIDIA's Linux team responded, "This is expected behavior for latest drivers...For feature parity between Windows and Linux we set BaseMosaic to 3 screens."

As described by NVIDIA's driver documentation, "[BaseMosaic] can be used to extend a single X screen transparently across all of the available display outputs on each GPU. This is like SLI Mosaic mode except that it does not require a video bridge connected to the graphics cards. Due to this Base Mosaic does not guarantee there will be no tearing between the display boundaries. Base Mosaic is supported on all the configurations supported by SLI Mosaic Mode. It is also supported on Quadro FX 380, Quadro FX 580 and all G80 or higher non-mobile NVS cards."

It'd be a bit more understandable if this was done due to regressions found when using four monitors or if the support could be optionally enabled behind an "experimental" flag if it doesn't receive any QA coverage, but it doesn't appear that way and has upset at least one NVIDIA Linux customer in dropping his system's configuration.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
Latest Linux Hardware Reviews
  1. Scythe Mugen MAX
  2. Intel Core i7 5960X Haswell-E On Linux
  3. Intel 80GB 530 Series M.2 SSD On Linux
  4. With A New Motherboard, The Core i7 5960X Haswell-E Lights Up
Latest Linux Articles
  1. Running Fedora 20 On Intel's Core i7 Haswell-E Platform
  2. A Tour Of The New Phoronix Office
  3. 7-Way Linux Desktop Gaming Comparison On Ubuntu 14.10
  4. Intel P-State vs. CPUFreq Benchmarks On The i7-5960X
Latest Linux News
  1. Counter-Strike: Global Offensive Starts Rolling Out To Linux Users
  2. Trying Out The OpenSUSE 13.2 Beta: The Installer Is Still Lacking
  3. The Gestures Support Of GNOME 3.14
  4. Linux 3.17 Has Basic Support For The Xbox One Controller
  5. openSUSE 13.2 Beta Still Using Btrfs By Default, & KDE Plasma 5 For Testing
  6. GTK+ 3.14 Brings Much Better Wayland Support, Multi-Touch, New Theme
  7. DisplayPort Comes To USB's Type-C Connector
  8. NSS Updated On Ubuntu 12.04/14.04 To Allow Netflix Support
  9. Linux 3.17-rc6 Released; Linux 3.17 Final Might Come In One Week
  10. X.Org Server 1.16.1 Released
Latest Forum Discussions
  1. X.Org Women Outreach Program Only Turns Up Two Applicants So Far
  2. Uselessd: A Stripped Down Version Of Systemd
  3. Updated and Optimized Ubuntu Free Graphics Drivers
  4. State of Nouveau now and in the near future?
  5. Wasteland 2 Officially Launched Today, Including For Linux Gamers
  6. NVIDIA GTX 770/780 -works ?
  7. New stress testing utility for GPU's
  8. How to get Catalyst 14.4 working on Ubuntu 14.04