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    SubjectRE: [Bug 10843] Display artifacts on XOrg logout with PAT kernel and VESA framebuffer
    Frans Pop wrote:
    > On Saturday 14 June 2008, Rafael J. Wysocki wrote:
    > > The following bug entry is on the current list of known regressions
    > > from 2.6.25. Please verify if it still should be listed.
    > >
    > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=10843
    > > Subject : Display artifacts on XOrg logout with PAT kernel and VESA
    > > framebuffer
    > > Submitter : Frans Pop <elendil@planet.nl>
    > > Date : 2008-05-31 14:04 (15 days old)
    > > References : http://lkml.org/lkml/2008/6/7/206
    >
    > Yes. See also: http://lkml.org/lkml/2008/6/13/159

    Frans, With or with out pat, in the recent kernels (like 2.6.26-rc4/rc5 etc), ioremap()
    uses UC- and PCI mmap of /sys/devices/pci.../resource (used by X) uses UC-

    And fb_mmap() also uses UC-.

    It's interesting that you don't see this artifact with "nopat". Essentially with
    or with out pat enabled, we use the same memory attributes. So depending on the
    MTRR setup (set by X server), effective memory attribute across different mappings
    should be same (which is UC- or WC with mtrr).

    Can you also check, if there is any impact with kernel boot param for vesafb "mtrr:3"?

    thanks,
    suresh


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