Blank screen on resume

[Eric McCorkle]

Note: I've moved the patch and logs to a new branch: https://github.com/emc2/freebsd/tree/resume_blank_screen


On March 12, 2016 10:39:42 PM EST, Eric McCorkle <eric at metricspace.net> wrote:
>Hello everyone,
>
>It seems I'm plagued by blank screens on resume again on a different
>laptop... *sigh*
>
>I've done quite a bit of diagnostic work on this, and there seem to be
>some clues, but I'm a bit stumped at this point.  The following github
>repo has patches that add extra logging, which has proven useful in my
>attempts to diagnose the issue: https://github.com/emc2/freebsd (sorry
>for distributing patches/logs in this way, but the logs are quite big).
>Also in this repo, there's a pciconf, devinfo, and dmesg file.  The
>dmesg file shows the trace from booting a patched kernel in verbose
>mode then suspending it.
>
>There's two main curiosities in the dmesg trace.  The first is that the
>power state of all the vgapci device seems to be 0 as opposed to 3
>during resume, which was causing acpi_set_powerstate_method to skip
>resetting its power during resume.  I tried a simple patch (you can see
>it in the patch and its effects in the trace), but that didn't seem to
>work.  A second curiosity is that acpi_pwr_switch_consumer only seems
>to have an effect during resume.
>
>The only other real lead I have is that the display doesn't seem to be
>active in acpi_video.  I'm not sure if this is an artifact of the efifb
>driver.
>
>Lastly, I recall looking into vga bios calls from earlier such efforts.
>I imagine there's something similar for efifb, but I've been unable to
>track down where this is happening.  Advice or information on that
>front would be much appreciated.
>
>Best,
>Eric
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