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<body><span class="vcard"><a class="email" href="mailto:jani.nikula@intel.com" title="Jani Nikula <jani.nikula@intel.com>"> <span class="fn">Jani Nikula</span></a>
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<a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [BYT dsi] WARNING: CPU: 3 PID: 265 at drivers/gpu/drm/drm_irq.c:1130 drm_wait_one_vblank+0x177/0x180()"
href="https://bugs.freedesktop.org/show_bug.cgi?id=90469">bug 90469</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>NEEDINFO
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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [BYT dsi] WARNING: CPU: 3 PID: 265 at drivers/gpu/drm/drm_irq.c:1130 drm_wait_one_vblank+0x177/0x180()"
href="https://bugs.freedesktop.org/show_bug.cgi?id=90469#c53">Comment # 53</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [BYT dsi] WARNING: CPU: 3 PID: 265 at drivers/gpu/drm/drm_irq.c:1130 drm_wait_one_vblank+0x177/0x180()"
href="https://bugs.freedesktop.org/show_bug.cgi?id=90469">bug 90469</a>
from <span class="vcard"><a class="email" href="mailto:jani.nikula@intel.com" title="Jani Nikula <jani.nikula@intel.com>"> <span class="fn">Jani Nikula</span></a>
</span></b>
<pre>(In reply to Laszlo Fiat from <a href="show_bug.cgi?id=90469#c51">comment #51</a>)
<span class="quote">> I found the commit that makes my DSI display go blank (and causes the
> WARNING) when the KMS loads with kernels newer than linux-next-20151119:
>
> <a href="https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/">https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/</a>
> drivers/gpu/drm/i915?id=7383123647566a813692bb37a1389c767ed89158
>
> Revert "drm/i915: skip modeset if compatible for everyone."
>
> This commit brings back the i915.fastboot parameter in disabled state, and
> with that the DSI screen goes blank when KMS loads.
>
> Adding i915.fastboot=1 kernel bootline parameter to a recent v4.6 RC4 kernel
> enables my Teclast X80h tablet to boot with the DSI screen enabled.</span >
Sorry, the earlier regressions trumps the later one, so we'll have to keep the
revert, for now.
Also, i915.fastboot=1 tries to skip modeset at module load, so presumably our
DSI modeset for your panel doesn't work. I suspect a modeset might fail if you
tried it after booting with i915.fastboot=1.
Please also attach /sys/kernel/debug/dri/0/i915_vbt</pre>
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