Messages in this thread | | | From | "Siddha, Suresh B" <> | Date | Sun, 15 Jun 2008 12:29:24 -0700 | Subject | RE: [Bug 10843] Display artifacts on XOrg logout with PAT kernel and VESA framebuffer |
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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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