On Tue, 2008-12-02 at 11:38 -0600, James Bottomley wrote: > On Tue, 2008-12-02 at 13:08 +0000, Sergio Monteiro Basto wrote: > > On Mon, 2008-12-01 at 11:42 -0600, James Bottomley wrote: > > > You probably remember the system, it's my fujitsu P7120 lifebook with > > > the funny backlight wiring. > > > > > > Previously, suspend/resume was made to work by saving the PCI state > > > including the legacy backlight register setting (and worked just fine > > > when invoked with a hal quirk). > > > > > > On FC9, with the 2.6.26 fedora kernels, hal no longer does anything and > > > relies on the i915 kernel driver. This was perfectly fine, except that > > > the backlight was now being restored to full brightness on resume rather > > > than the setting on resume. The other annoyance was that VT consoles > > > were now lost on resume (switching to them produces a black screen, > > > although switching back to vt7 where X is running is fine). > > > > > > As of the 2.6.27 fedora kernels, the backlight is now off on resume, > > > which is even more annoying. It can be turned on by doing a VT switch, > > > although all the console VTs are still blank, so there looks to be some > > > bug in the i915 driver that crept in between 2.6.26 and 2.6.27. > > > > Hum as quick answer , kernel fedora 2.6.27 have change _DOS thing. > > So may be that is the problem. > > The fedora patch is talked about on lkml > > http://lkml.org/lkml/2008/11/10/233 >
> Actually, they haven't. I'm running 2.6.27.5-41.fc9.i686 and if I look > in the kernel SRPM for that kernel (by building it) the relevant area of > drivers/acpi/video.c is > ok , I forgot , fedora kernels 2.6.27 for fc10. Also don't know the state of Arlied drm stuff, if it is only on fc10 or not . I trace this information on : http://koji.fedoraproject.org/koji/packageinfo?packageID=8 > /* acpi_video interface */ > > static int acpi_video_bus_start_devices(struct acpi_video_bus *video) > { > return acpi_video_bus_DOS(video, 0, 0); > } > > static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) > { > return acpi_video_bus_DOS(video, 0, 1); > } > > So nothing's changed in that area since 2.6.26. > > It could still be a disagreement between ACPI, BIOS and the driver over > who turns on the backlight, but the loss of the text console strongly > suggests that something is slightly wrong with the VGA modes. > > > About this _DOS , I reported this problem a long time ago, which now > > is on http://bugzilla.kernel.org/show_bug.cgi?id=6001 > > James > > -- Sérgio M. B.
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