[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 #30 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to bs666_1 from comment #29)
> Created attachment 123802 [details]
> dmesg 4.6.0-rc7 drm-intel-nightly
> 
> Added dmesg

Unrelated to this bug, but I noticed in your dmesg that your BYT is running
with a 333 MHz CZ clock. I've been looking for one of those to confirm how the
minimum GPU frequency behaves.

[    5.328217] [drm:intel_update_czclk] CZ clock rate: 333333 kHz
[    5.462363] [drm:vlv_init_gpll_ref_freq] GPLL reference freq: 20833 kHz
[    5.466068] [drm:valleyview_init_gt_powersave] DDR speed: 1333 MHz
[    5.470064] [drm:valleyview_init_gt_powersave] max GPU freq: 646 MHz (214)
[    5.478082] [drm:valleyview_init_gt_powersave] RPe GPU freq: 646 MHz (214)
[    5.478104] [drm:valleyview_init_gt_powersave] RP1(Guar Freq) GPU freq: 312
MHz (198)
[    5.478121] [drm:valleyview_init_gt_powersave] min GPU freq: 187 MHz (192)

Can you do a 'grep . /sys/class/drm/card0/gt_*' and
'intel_reg read punit:0xd3 punit:0xd4 punit:0xd8 nc:0x1c nc:0x30 nc:0x34'
when the GPU is idle?

-- 
You are receiving this mail because:
You are on the CC list for the bug.
You are the assignee for the bug.
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20160517/4464f899/attachment.html>