[Bug 82880] [BYT dsi] Black screen on modesetting with Dell Venue 8 Pro (older firmware) on 3.16.x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82880

--- Comment #32 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to bs666_1 from comment #31)
> 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

I take it that was with 4.4 or earlier kernel? Anyway, based on those the
register values it does look like our current code is in fact correct also for
the cz=333 case.

-- 
You are receiving this mail because:
You are the assignee for the bug.
You are the QA Contact for the bug.
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20160518/2cb01887/attachment.html>