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    SubjectRe: [PATCH] vga: implements VGA arbitration on Linux
    On Tue, 11 Aug 2009 15:52:06 +1000
    Dave Airlie <> wrote:

    > From: Tiago Vignatti <>
    > Background:
    > Graphic devices are accessed through ranges in I/O or memory space.
    > While most modern devices allow relocation of such ranges, some
    > "Legacy" VGA devices implemented on PCI will typically have the same
    > "hard-decoded" addresses as they did on ISA. For more details see
    > "PCI Bus Binding to IEEE Std 1275-1994 Standard for Boot
    > (Initialization Configuration) Firmware Revision 2.1" Section 7,
    > Legacy Devices.
    > The Resource Access Control (RAC) module inside the X server
    > currently does the task of arbitration when more than one legacy
    > device co-exists on the same machine. But the problem happens when
    > these devices are trying to be accessed by different userspace
    > clients (e.g. two server in parallel). Their address assignments
    > conflict. Therefore an arbitration scheme _outside_ of the X server
    > is needed to control the sharing of these resources. This document
    > introduces the operation of the VGA arbiter implemented for Linux
    > kernel.
    > Signed-off-by: Tiago Vignatti <>
    > Signed-off-by: Dave Airlie <>

    Ok, applied this to my linux-next branch, but I'd like to get Ben's
    s-o-b before pushing it to Linus.


    Jesse Barnes, Intel Open Source Technology Center

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