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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Display does not work when resuming from suspend"
href="https://bugs.freedesktop.org/show_bug.cgi?id=42960#c34">Comment # 34</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Display does not work when resuming from suspend"
href="https://bugs.freedesktop.org/show_bug.cgi?id=42960">bug 42960</a>
from <span class="vcard"><a class="email" href="mailto:djtm@gmx.net" title="D <djtm@gmx.net>"> <span class="fn">D</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=42960#c32">comment #32</a>)
<span class="quote">> I tested with 3.15-git , and it looks like the kernel parameter has no
> effect there - the same problem occurs again! Even with acpi_sleep=s3_bios ,
> on suspend and resume the laptop LVDS display is blank.
>
> Does anyone know if this was an intentional change, to remove the ability to
> do this?</span >
Hi, did you check using echo mem > /sys/power/state?
Because e.g. pm-suspend resets those parameters via
/proc/sys/kernel/acpi_video_flags. (Value should be 1, 2, or 3 if you have
kernel parameters set)
For pm-suspend to work (e.g. *Ubuntu) you need to create a file
/etc/pm/config.d/radeon
which contains
QUIRK_S3_BIOS="true"
QUIRK_S3_MODE="true"</pre>
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