Pavel Machek wrote: > On Tue 2007-03-13 19:42:07, Tim Gardner wrote: >> Pavel Machek wrote: >>> Hi1 >>> >>>> I've chased one of the 'Suspend to RAM' resume problems to a specific >>>> line in drivers/char/vt.c, see attached 2.6.21-rc3 diff with >>> Has suspend/resume ever worked on that hardware? >>> >>>> TRACE_RESUME() instrumentation. The macro scr_writew resolves to '*addr >>>> = val', which appears to be causing the problem. I've verified that the >>>> pointer is not NULL, but don't know if its really valid. Its pretty >>>> tough to tell what is happening, but on a Dell XPS it just hangs. A Dell >>>> Precision blinks the keyboard lights. >>> It is possible that video is not initialized at that point, and that >>> hardware goes seriously unhappy when you access non-existing vga. Does >>> it resume ok when you completely disable video support? >> Resume works on the Dell XPS with the Ubuntu Edgy release >> Ubuntu-2.6.17-10.25 (2.6.17 plus a zillion fixes). Ubuntu's git tree is >> rsync://rsync.kernel.org/pub/scm/linux/kernel/git/bcollins/ubuntu-2.6.git. >> Ubuntu-2.6.17-8.21 is the first version where resume works, but there >> are a boatload of changes in ACPI and SW suspend between that and the >> previous tag Ubuntu-2.6.17-7.20. I don't know what made SW suspend work, >> but even knowing that won't tell me what broke it again. >> >> I've been avoiding the bisect process because it is quite time consuming >> on my slow machine, there is much branch weirdness, and I'm not that >> good with git. I thought if I narrowed the failure down to a small chunk >> of code in 2.6.21-rc3, then the answer might be obvious. No such luck, huh? >> >> This crash behaves like the video memory space has become unmapped. Is >> that possible? > > That seems improbable. It is physical ram, we do not unmap that.. >
The machine _has_ just come out of BIOS ACPI space. Perhaps PCI resources for video are hosed. All I can tell for sure is that this one line appears to cause some kind of crash. I'm working on finding some 1394 resources to see if I can nail this one. -- Tim Gardner [EMAIL PROTECTED] - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
