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.
So what is the next step in debugging this?
Regards,
Hans
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