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Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=10843 On Wednesday 25 June 2008, Suresh Siddha wrote: > On Mon, Jun 23, 2008 at 05:38:59AM -0700, Frans Pop wrote: > > On Sunday 15 June 2008, Siddha, Suresh B wrote: > > > Frans, With or without 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). > > > > Any progress on this issue? It's still there with -rc7, but I doubt > > that comes as a surprise. > > > > Has anyone tried to reproduce this? I would think that should be > > trivial. > > > > Just as a summary: > > - Intel 82945G/GZ graphics [8086:2772] (ICH7 based system) > > - FB_VESA=y, FRAMEBUFFER_CONSOLE=y > > - boot with vga=791 > > - Log in to X and KDE; I do need to really log in there are no > > artifacts if I exit X from the kdm login dialog > > - artifacts show on logout > > > > FJP, We will try to reproduce this and getback. Hello all, I'd like to bring this issue to your attention once again as it is still present in 2.6.27-rc6. Note also that I can trivially reproduce exactly the same behavior on three rather different systems. The artifacts even look similar and in all cases they disappear with 'nopat'. The systems are: Toshiba Satellite A40 laptop: - Intel 82852/855GM Integrated Graphics Device [8086:3582] - ICH4 based - Mobile Intel Pentium 4 processor, i386 kernel Intel desktop system: - Intel 82945G/GZ Integrated Graphics Controller [8086:2772] - ICH7 based - Pentium D processor, x86_64 kernel HP Compaq 2510p laptop: - Intel Mobile GM965/GL960 Integrated Graphics Controller [8086:2a02] - ICH8 based - Core2 Duo processor, x86_64 kernel Have you had any luck reproducing it? > Your earlier responses did not give many clues. Well, unfortunately I can only provide the info you ask for :-) Cheers, FJP | ||||||||||||
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