[HEADSUP] amd64 suspend/resume code to be comitted

[Paul B. Mahol]

On 3/26/09, Daniel Thiele <dthiele at gmx.net> wrote:
> Jung-uk Kim wrote:
>> On Wednesday 25 March 2009 05:28 pm, Gustau Perez wrote:
>>>> Please try the attached patch, which just disables restoring VGA
>>>> state while resuming.
>>>   Tried your patch again, and this time using hw.acpi.reset_video,
>>> hw.acpi.suspend_bounce and friends. The same result, the screen
>>> remains completely black.
>>>
>>>    Before appliying the patch, when resuming the screen showed
>>> messages about the resume of some hardware (usb, firewire, etc ...)
>>> and then it went black.
>>>
>>>   Is there anything I can test ?
>>
>> Then, it is something else, e.g., acpi_video(4).  You can try setting
>> debug.acpi.disabled="video" in /boot/loader.conf for example.
>>
>
> I have the same problem here with a ThinkPad T400. This is a model with
> the Switchable Graphics feature, but I set the corresponding BIOS option
> to use the integrated Intel GMA X4500 only. Suspend and resume seem to
> work except for video output. I am using a vanilla CURRENT from March 25
> (so I have not tried the vga_isa.diff patch yet).
>
> As in Gustau's case, after resume the screen stays just black. The
> system, though, seems to be up and running, since I get console's
> audible bell when I expect it and I can edit files, blindly of course.
> Setting debug.acpi.disabled="video" in /boot/loader.conf produces the
> same result: A black screen right after resume.
>
> I also tried setting hw.acpi.reset_video to 1 but the the machine does
> not resume at all. When I, in this case, additionally turn on
> debug.acpi.resume_beep all I get is a long beep that only stops, if I
> power-cycle the machine.
>
> Also, at first I tried to use an USB flash drive to test suspend/resume
> on amd64, which results in a panic on suspend. Unfortunately, I don't
> have any dumps, but the "tracing pid" output from "where" at the
> debugger prompt reported PID 12, wich seems to be [intr]. Or at leas it
> seem to be intr whenever I look up PID 12. Right now I am (ab)using my
> swap partition, which works fine.
>
> So, if there are any other knobs to fiddle with or patches to try out
> to investigate this further (at least the black screen issue) just let
> me know.

The only way I managed (without suspending while inside X11) my HP
nx7300 on UP i386 to
resume with video working is kldloading vesa before suspend.

-- 
Paul