On Wed, Apr 10, 2019 at 11:09 AM Hans de Goede <hdego...@redhat.com> wrote: > > Hi, > > On 10-04-19 11:00, Patrik Jakobsson wrote: > > On Wed, Apr 10, 2019 at 9:27 AM Hans de Goede <hdego...@redhat.com> wrote: > >> > >> Hi, > >> > >> On 09-04-19 21:31, Dominik 'Rathann' Mierzejewski wrote: > >>> Hello, > >>> > >>> On Tuesday, 09 April 2019 at 16:44, Hans de Goede wrote: > >>>> Hi, > >>>> > >>>> On 09-04-19 14:05, Patrik Jakobsson wrote: > >>>>> On Tue, Apr 9, 2019 at 12:20 PM Hans de Goede <hdego...@redhat.com> > >>>>> wrote: > >>>>>> > >>>>>> Hi, > >>>>>> > >>>>>> On 09-04-19 11:47, Patrik Jakobsson wrote: > >>>>>>> On Tue, Apr 9, 2019 at 8:51 AM Hans de Goede <hdego...@redhat.com> > >>>>>>> wrote: > >>>>>>>> > >>>>>>>> Some CedarView VBT-s claim that there is a LVDS panel, while there > >>>>>>>> is none. > >>>>>>>> Specifically this happens on the Thecus N2800 / N5550 NAS models. > >>>>>>>> > >>>>>>>> This commit adds a LVDS blacklist to deal with this and adds an > >>>>>>>> entry for > >>>>>>>> the Thecus NAS-es. > >>>>>>> > >>>>>>> Hi Hans, > >>>>>>> Sometimes LVDS can be configured in the BIOS on CDV devices. Can you > >>>>>>> check that it's not just a bad BIOS configuration first? > >>>>>> > >>>>>> I've asked the reporter to test, but even if there is a BIOS option it > >>>>>> seems that the BIOS default setting is wrong and we cannot expect every > >>>>>> user to go into the BIOS to fix a wrong BIOS setting. > >>>>>> > >>>>>> According to this blogpost, which is about the Linux the device ships > >>>>>> with: > >>>>>> https://astroweasel.blogspot.com/2016/02/updating-thecus-n5550-nas-to-report.html > >>>>>> > >>>>>> The pre-installed grub config includes 'video=LVDS-1:d' on the kernel > >>>>>> commandline, so this clearly seems to be a case where the system is > >>>>>> just > >>>>>> shipping with a broken BIOS or at least with default BIOS settings > >>>>>> which > >>>>>> is just as bad. > >>>>> > >>>>> I agree that we should try to fix a broken default but are you sure > >>>>> this will only affect the n5550? IIUC Milstead / Granite Well is an > >>>>> Intel product / board name and perhaps some of those use LVDS. > >>>> > >>>> Milstead is the name of Intel's NAS reference design: > >>>> > >>>> https://www.hardwarezone.com.my/tech-news-intel-unveils-milstead-platform-nas-devices > >>>> > >>>> I seriously doubt that any NAS-es have a LVDS (laptop/tablet) LCD panel. > >>>> > >>>>> Also, if the pre-installed OS solves this on the cmdline then it's > >>>>> only a problem if the user is trying to install a custom OS on the > >>>>> device. I would expect such a user to be able to change bios settings. > >>>>> > >>>>> I'm not totally against this but not sure about the consequences. Is > >>>>> there perhaps a better dmi string to match against? > >>>> > >>>> No there are no better DMI strings to match against I'm afraid. > >>> > >>> I did load default settings in BIOS setup and there's no change in > >>> behaviour. LVDS gets detected as connected: > >>> $ cat /sys/class/drm/card0-LVDS-1/status > >>> connected > >>> > >>> Only VGA output is physically connected at the moment. > >> > >> To be clear what Dominik means here is that he has a VGA monitor > >> connected. There is no LVDS panel in this device at all. > > > > Thanks for testing. I dusted off my DN2800MT and tried turning LVDS > > on/off in the BIOS. With LVDS disabled gma500 reports it as connected. > > When LVDS is enabled in bios I instead get a connected eDP connector. > > I'm starting to think that broken VBT parsing might be the actual > > problem. > > Maybe, but I assume there are CedarView based laptops with LVDS panels > which works, so I suspect this might be more of a bug in your BIOS.
I was thinking of the case where LVDS is disabled. Things work fine when there actually is a panel present. > > So what is the next step in debugging this? I'll give Villes suggestion a try. > > Regards, > > Hans > _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
