On Wed, 2008-03-12 at 09:21 +0800, Thomas Renninger wrote: > > On Wed, 2008-03-12 at 01:21 +0100, Thomas Renninger wrote: > > On Fri, 2008-01-25 at 14:47 +0800, Zhang Rui wrote: > > > From: Zhang Rui <rui.zhang@xxxxxxxxx> > > > > > > Display switching via ACPI control methods are known to work on > none > > > platform AFAIK. > > > And graphics people want to control the display switching all by > themselves. > > > Prevent ACPI from handling display switch hotkey events in this > patch. > > > > I expect this one has to be reverted. > > I can double check tomorrow, but I am pretty sure I have a Compaq > and > > also saw more and I expect there are a lot more that work pretty > fine > > with Display Output Switching (_DOS) set to be handled by BIOS and > not > > graphics driver. > > > > As said, I can double check, but this would be a regression. > > > > IMO the logic should be: > > - Let the BIOS handle the switching (also works without X) > > - If a graphics driver gets active which can do the switching, it > can > > take over control by: > > echo 0 >/proc/acpi/video/*/DOS > > > > I mixed this up with the default value for _DOS: > git commit a21101c46ca5b4320e31408853cdcbf7cb1ce4ed > > Again, IMO the logic should be: > - Let the BIOS handle the switching (also works without X) > - If a graphics driver gets active which can do the switching, it can > take over control by: > echo 0 >/proc/acpi/video/*/DOS That's what I thought at the beginning, and the bug http://bugzilla.kernel.org/show_bug.cgi?id=6001 suggested me to set _DOS to 0 by default. > > Also the bug which above commit claims to fix has an interesting > add-on > comment (after the bug got closed): > ---------------- > My HP 6710B also crashes when DOS=0, DOS=1,2 or 3 works just fine > though. which version of kernel are you using? I get this problem before, but it can not be reproduced in the kernel later than 2.6.23. > This > has an GM965 intel chipset. What does the ACPI spec say about values > other then > 0 or 1 ? nothing interesting. And many laptops don't follow the ACPI spec on this. :( > It seems that the change that was done from 1 to 0 causes some quit > bad > regressions on some laptops, while fixing others. Otoh all reporters > say that > DOS=2 works.. > ---------------- well, DOS=2 doesn't work either... there is no solution that can work for all laptops. thanks, rui -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
