On Mon, 2012-07-30 at 08:28 -0700, Darren Hart wrote: > > On 07/30/2012 02:50 AM, Kamble, Nitin A wrote: > > > > > >> -----Original Message----- From: Darren Hart > >> [mailto:dvh...@linux.intel.com] Sent: Saturday, July 28, 2012 3:27 > >> AM To: Kamble, Nitin A Cc: yocto@yoctoproject.org; > >> bruce.ashfi...@windriver.com; Zanussi, Tom Subject: Re: [yocto] > >> [PATCH 2/6] crownbay: customize the xorg.conf for the flat panel on > >> the corwnbay kit > >> > >> > >> > >> On 07/26/2012 10:31 PM, Kamble, Nitin A wrote: > >>>>>> On 07/23/2012 03:06 AM, nitin.a.kam...@intel.com wrote: > >>>>>>> From: Nitin A Kamble <nitin.a.kam...@intel.com> > >>>>>>> > >>>>>>> The kit has Auo 800x600 LCD screen. Configuring Xorg for > >>>>>>> it. > >>>>>> > >>>>>> I presume the crownbay has additional display options? how > >>>>>> does this impact those? > >>>>>> > >>>>> This change sets the resolution of the screen to 800x600. And > >>>>> this is applicable to LCD screen on the kit as well as > >>>>> external monitor. I will add a note about it in the log. > >>>> > >>>> I presume that without this change it was able to detect the > >>>> appropriate resolution of the connected monitor, but not of the > >>>> LCD? > >>>> > >>>> If so, this change effectively breaks that autodetection and > >>>> forces everything to the 800x600 display which is arguably > >>>> very low-resolution by today's standards. Why should this be > >>>> the default? When you refer to "the kit", what exactly are you > >>>> referring to? > >>>> > >>>> Also, is this a discussion you have already had with Tom? I > >>>> don't want to contradict what he has said regarding this BSP. > >>> > >>> > >>> EMGD driver on crownbay gives few resolutions as options. By > >>> default it tries to set 1366x768 resolution for both LCD and > >>> external monitor. The Crownbay kit is a suitcase kind of box, > >>> which has builtin LCD screen of resolution 800x600. This LCD > >>> screen shows only 800x600 of the default 1366x768 area. So The > >>> LCD is not able to show all the screen, and IMO it is a > >>> functional issue. > >>> > >>> For my Dell 1704FPTi monitor which has 1280x1024 native > >>> resolution; When connected to the crownbay, X cannot find a > >>> working mode for this monitor. But if I set 800x600 in the > >>> xorg.conf as this commit does, then both LCD & external monitor > >>> can show the X screen without any issues. > >> > >> This seems like a bug to me. The driver should be able to probe the > >> display and use the optimal resolution without it being specified > >> in the Xorg.conf. So far as I know we don't specify resolution in > >> any of the meta-intel BSPs: > >> > >> dvhart@envy:~/source/poky/layers/meta-intel [denzil] $ find . > >> -name xorg.conf | xargs grep -i Modes > >> > >> So while I agree the kit screen should work out of the box, the > >> fact that even your dell lcd monitor doesn't work is cause for > >> concern. Is there anything in the Xorg log that indicates why it > >> isn't able to get the EDID data? > >> > >> -- Darren > >> > > > > In the xorg log I do not see any useful EDID information. Either > > these displays do not support EDID, or the EDID support in the EMGD > > driver is not working well with these devices. And the EMGD driver is > > closed source. So we can't fix it. So IMO keeping the resolution to > > 800x600 is the best possible solution for crownbay BSP. > > Tom, > > I've never booted a crownbay machine. What has your experience been with > the displays on this board? >
I've never had any problems with X autodetecting the correct resolution for either the LVDS or DVI output. I actually had the unit Nitin has now, but the first thing I did with that was unhook the dinky little built-in panel and hook up a normal-sized LVDS screen that I could stand up separately for testing. In any case, I don't think it makes sense to hard-code a resolution for a particular unusual screen in the default BSP - I'd suggest opening a bug to find out why this screen can't be auto-detected if it's important... Tom _______________________________________________ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto
