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DateSun, 13 Jul 2008 10:56:03 +0200
FromPavel Machek <>
SubjectRe: [RFT] x86 acpi: normalize segment descriptor register on resume
Hi!

> > > Is there an Intel graphics in your box?> > > > Yes.> > > > > > > >> -rc8 and -rc9 with the original patch 4b4f7280 resume fine no matter how 
> > >> I suspend.> > > > > > That's _really_ strange.> > > > > > In fact I have only one explanation, which is that the Gnome suspend button
> > > causes some user-space quirks to be applied, which are harmful and break the
> > > resume.  Also, without commit 4b4f7280 those quirks might have not been really
> > > executed.  Peter, does it sound reasonable?> > > > Bingo.  It's a HAL quirk.> > > > Testing from the console (not X):> > > > With 4b4f7280:> > # echo mem >/sys/power/state -- works fine> > > > # echo 3 >/proc/sys/kernel/acpi_video_flags> > # echo mem >/sys/power state -- fails to resume> > > > Without 4b4f7280:> > # echo mem >/sys/power/state -- works fine> > > > # echo 3 >/proc/sys/kernel/acpi_video_flags> > # echo mem >/sys/power state -- works fine> > > > So HAL contains an apparently unnecessary quirk for my laptop, and 
> > 4b4f7280 breaks that quirk.  Of course, it's entirely possible that 
> > 4b4f7280 is 100% correct, but that the quirk only worked by accident and 
> > 4b4f7280 broke the call into video BIOS.> > We've had reports from users of Intel graphics and the i915 driver that
> previously working quirks started to break their systems with 2.6.26-rc, but
> instead the plain "echo mem > /sys/power/state" started to work for them.
> Your system may be one of these, but I wonder what the effect of commit
> 4b4f7280 is.

In such case, you could verify by disabling intel framebuffer and just
using plain VGA driver (or vesafb).

Breaking video bios calls would be bad.
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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