From: Rob Kramer <rob@solution-space.com>
To: dri-devel@lists.freedesktop.org
Subject: Re: Troubleshooting LVDS on GM45 (kernel 4.5.0)
Date: Mon, 4 Apr 2016 11:14:45 +0800 [thread overview]
Message-ID: <5701DC25.7080504@solution-space.com> (raw)
In-Reply-To: <87vb41zips.fsf@intel.com>
I've tried again without video parameter -- same outcome. I've also
applied Ville's patch "drm/i915: Read timings from the correct
transcoder in intel_crtc_mode_get()" (with teeny backport fix). It seems
this code is never called in my case though, since intel_lvds_init()
chooses to use the VBT mode instead. Log is uploaded here:
http://pastebin.com/bGa2UvLu
Since this VBT mode is probably junk anyway, I commented out the
if-statement that selects it (in intel_lvds.c), so that the code will
pick the mode as set by BIOS. The result is much better, I actually get
proper looking output! X also runs well on top of that.
There are still several errors in the log file though (probably caused
by my little hack), see here: http://pastebin.com/UbCjizSV.
Is using the mode as set up by BIOS the way to go for LVDS? If so, is
there a module parameter that can force this, or force the bogus VBT to
be disregarded?
Cheers!
Rob
On 04/01/2016 07:11 PM, Jani Nikula wrote:
>
> Apr 1 11:32:21 vides user.err kernel: [ 4.896341] [drm:i9xx_crtc_compute_clock [i915]] *ERROR* Couldn't find PLL settings for mode!
>
> Please try without the kernel command line mode.
>
> BR,
> Jani.
>
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next prev parent reply other threads:[~2016-04-04 3:14 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-01 4:49 Troubleshooting LVDS on GM45 Rob Kramer
2016-04-01 8:01 ` Jani Nikula
2016-04-01 8:11 ` Rob Kramer
2016-04-01 10:07 ` Troubleshooting LVDS on GM45 (kernel 4.5.0) Rob Kramer
2016-04-01 11:11 ` Jani Nikula
2016-04-04 3:14 ` Rob Kramer [this message]
2016-04-04 14:58 ` Ville Syrjälä
2016-04-05 4:07 ` Rob Kramer
2016-04-01 15:37 ` [PATCH 1/2] drm/i915: Read timings from the correct transcoder in intel_crtc_mode_get() ville.syrjala
2016-04-01 15:37 ` [PATCH 2/2] drm/i915: Use intel_get_pipe_timings() and intel_mode_from_pipe_config() " ville.syrjala
2016-04-01 18:48 ` [PATCH v2 " ville.syrjala
2016-04-13 12:08 ` Ville Syrjälä
2017-09-25 19:19 ` Chris Wilson
2017-10-09 16:18 ` Ville Syrjälä
2017-10-09 16:24 ` Chris Wilson
2017-10-09 16:48 ` Ville Syrjälä
2017-09-25 14:18 ` [Intel-gfx] [PATCH 1/2] drm/i915: Read timings from the correct transcoder " Chris Wilson
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