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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [SNB] Blank screen after cycling HDMI receiver input"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100885#c19">Comment # 19</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [SNB] Blank screen after cycling HDMI receiver input"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100885">bug 100885</a>
from <span class="vcard"><a class="email" href="mailto:matt@matthoran.com" title="Matt Horan <matt@matthoran.com>"> <span class="fn">Matt Horan</span></a>
</span></b>
<pre>(In reply to Matt Horan from <a href="show_bug.cgi?id=100885#c18">comment #18</a>)
<span class="quote">> (In reply to Ville Syrjala from <a href="show_bug.cgi?id=100885#c17">comment #17</a>)
> > We now have the properly to limite the bpc.
> >
> > xrandr --output <whatever> --set 'max bpc' 8
> >
> > Does that help?
>
> Does this require a specific kernel version and/or xrandr version? Happy to
> give it a shot.</span >
I discovered that all that is needed is a kernel that supports the 'max bpc'
prop, so I installed kernel 5.0.2. I successfully set max bpc to 8 when the
display was working. However, when switching to another input and then back,
the screen was blank. I could no longer set max bpc. xrandr --props showed max
bpc of 12. If I tried to set max bpc to 8, the setting was seemingly ignored,
and the screen remained blank.
I also tested with a newer Haswell machine, running both Windows and Linux. On
Windows, I could not reproduce the issue. On Linux, I could not reproduce the
issue as reliably, but it did occur. Interestingly, switching inputs a second
time would resolve the issue. This is not a viable solution, however, as I do
not plan to replace my SNB system any time soon (and something still seems
broken.)
The only difference I noticed between Windows and Linux is that Windows never
switched the display to 12bpc. I could not find an option in Windows to cause
this to happen.</pre>
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