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<body><span class="vcard"><a class="email" href="mailto:lakshminarayana.vudum@intel.com" title="Lakshmi <lakshminarayana.vudum@intel.com>"> <span class="fn">Lakshmi</span></a>
</span> changed
<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>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Priority</td>
<td>high
</td>
<td>medium
</td>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>NEEDINFO
</td>
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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#c21">Comment # 21</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:lakshminarayana.vudum@intel.com" title="Lakshmi <lakshminarayana.vudum@intel.com>"> <span class="fn">Lakshmi</span></a>
</span></b>
<pre>(In reply to Matt Horan from <a href="show_bug.cgi?id=100885#c19">comment #19</a>)
<span class="quote">> (In reply to Matt Horan from <a href="show_bug.cgi?id=100885#c18">comment #18</a>)
> > (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.
>
> 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.</span >
(In reply to James Ausmus from <a href="show_bug.cgi?id=100885#c20">comment #20</a>)
<span class="quote">> Can you retest with drm-tip? There have been some changes around the max_bpc
> handling that may impact your situation</span >
No feedback from more than a month. Dropping the Priority to Medium.
Matt, Can you please provide your feedback after verifying the issue drm-tip
(<a href="https://cgit.freedesktop.org/drm-tip">https://cgit.freedesktop.org/drm-tip</a>) ?</pre>
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