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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [BYT dsi] Black screen on modesetting with Dell Venue 8 Pro (older firmware) on 3.16.x"
href="https://bugs.freedesktop.org/show_bug.cgi?id=82880#c31">Comment # 31</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [BYT dsi] Black screen on modesetting with Dell Venue 8 Pro (older firmware) on 3.16.x"
href="https://bugs.freedesktop.org/show_bug.cgi?id=82880">bug 82880</a>
from <span class="vcard"><a class="email" href="mailto:bs666_1@hotmail.com" title="bs666_1@hotmail.com">bs666_1@hotmail.com</a>
</span></b>
<pre>I can't really be certain the GPU was idle as the screen was blank but the
values were stable and I'm fairly sure it was at a fbcon vt.
$ sudo ./intel_reg read punit:0xd3 punit:0xd4 punit:0xd8 nc:0x1c nc:0x30
nc:0x34 --spec=registers
punit:0x000000d3 (0x04:0x000000d3): 0x000000bf
punit:0x000000d4 (0x04:0x000000d4): 0x000000bf
punit:0x000000d8 (0x04:0x000000d8): 0x0000c0d0
nc:0x0000001c (0x11:0x0000001c): 0xbbfe36b4
nc:0x00000030 (0x11:0x00000030): 0xb378ad39
nc:0x00000034 (0x11:0x00000034): 0xfc0eb636
$ sudo grep . /sys/class/drm/card0/gt_*
/sys/class/drm/card0/gt_act_freq_mhz:187
/sys/class/drm/card0/gt_cur_freq_mhz:167
/sys/class/drm/card0/gt_max_freq_mhz:645
/sys/class/drm/card0/gt_min_freq_mhz:167
/sys/class/drm/card0/gt_RP0_freq_mhz:645
/sys/class/drm/card0/gt_RP1_freq_mhz:312
/sys/class/drm/card0/gt_RPn_freq_mhz:167</pre>
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