Messages in this thread | | | From | "Pallipadi, Venkatesh" <> | Date | Fri, 12 Sep 2008 05:43:24 -0700 | Subject | RE: [Bug 10843] Display artifacts on XOrg logout with PAT kernel and VESA framebuffer |
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>-----Original Message----- >From: Frans Pop [mailto:elendil@planet.nl] >Sent: Friday, September 12, 2008 3:54 AM >To: Siddha, Suresh B >Cc: Linux Kernel Mailing List; Pallipadi, Venkatesh; Ingo >Molnar; arjan@linux.intel.com; jbarnes@virtuousgeek.org >Subject: Re: [Bug 10843] Display artifacts on XOrg logout with >PAT kernel and VESA framebuffer > >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 :-) >
Hi,
What does the output of x86/pat_memtype_list under debugfs look like?
You may need the following if you are not already mounting debugfs. mount -t debugfs debugfs /proc/sys/debug cat /proc/sys/debug/x86/pat_memtype_list
Thanks, Venki
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