[Intel-gfx] i915 driver on Minnow board - 1920x1200 resolution not working

[vinoth eswaran]

On Tue, Jun 21, 2016 at 4:50 PM, Jani Nikula
<jani.nikula at linux.intel.com> wrote:
> On Tue, 21 Jun 2016, vinoth eswaran <evinoth1206 at gmail.com> wrote:
>> On Tue, Jun 21, 2016 at 12:54 PM, Jani Nikula
>> <jani.nikula at linux.intel.com> wrote:
>>> On Tue, 21 Jun 2016, vinoth eswaran <evinoth1206 at gmail.com> wrote:
>>>> On Tue, Jun 21, 2016 at 11:35 AM, Jani Nikula
>>>> <jani.nikula at linux.intel.com> wrote:
>>>>> On Tue, 21 Jun 2016, vinoth eswaran <evinoth1206 at gmail.com> wrote:
>>>>>> On Tue, Jun 21, 2016 at 10:17 AM, Jani Nikula
>>>>>> <jani.nikula at linux.intel.com> wrote:
>>>>>>> On Tue, 21 Jun 2016, vinoth eswaran <evinoth1206 at gmail.com> wrote:
>>>>>>>> Hello,
>>>>>>>>
>>>>>>>> I am currently working on an embedded project using Minnowboard max. I
>>>>>>>> have builded a customized Linux kernel-v4.4 and using u-boot (latest
>>>>>>>> version) as Boot loader.
>>>>>>>>
>>>>>>>> The VESA driver in the u-boot takes more time to initialize,so I have
>>>>>>>> disabled it. I am passing the kernel parameters "video=" to enable the
>>>>>>>> HDMI port to which a monitor is connected.
>>>>>>>
>>>>>>> Is is a DVI display?
>>>>>>        Its an LED Monitor - LG 24EB23.
>>>>>> The monitor supports the HD resolution.
>>>>>
>>>>> How do you connect the display? Is it HDMI directly or using the DVI
>>>>> connector?
>>>>>
>>>>    Sorry initially I got the question wrongly.
>>>> Micro HDMI connector to the board and then HDMI-DVI cable to connect
>>>> to the monitor.
>>>
>>> Single link DVI is limited to 165 Mhz. It *might* work with CVT and
>>> reduced blanking. Please try video=HDMI-A-1:1920x1200 at 60RMD as the mode.
>>>
>>> I'm surprised the display doesn't report that via EDID to begin with;
>>> what does it do without the video parameter on the command line?
>>
>>     The display is not coming up now. Also without no video parameter,
>> the display is not coming up.
>> I checked the status of card-0* in /sys/class/drm all the three
>> connectors are listed as disconnected.
>>
>> I have attached the drm driver logs for your reference.
>
> Gets too noisy to debug here. Please file a bug at [1].
>
> BR,
> Jani.
>
> [1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel
>
> --
> Jani Nikula, Intel Open Source Technology Center


I have tried also with the argument video=HDMI-A-1:1920x1200 at 60RMD and
have the same issue display not coming up. I saw from the logs and
found that there is a parsing error and gone through the modedb.txt
file and found a small mistake in the arguments passing

The structure is,
<xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]

So I tried using the parameter video=HDMI-A-1:1920x1200MR at 60D. Now the
display is coming up in HD resolution.

Thanks & Regards,
VInothkumar