rotating screen in debian tablet

jdd

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Feb 21, 2016, 5:10:04 AM2/21/16

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Hello,

I try to install debian jessie on a windows 10 It Works TW891 tablet
(with attached keyboard)

using the hybrid 32/64 bits dvd, I could install jessie with xfce.

But... it's installed in portrait mode (the screen need to be seen with
the longer size vertical), when the keyboard expect a lanscape mode, so
it's really unfriendly :-).

I could make the *initial terminal* (text mode), to display in the right
position, adding to the grub2 kernel line:

vga=791
fbcon=rotate:1
video=efifb
nomodeset

may be one of these options is not right, but I couldn't test all. not
the question here, probably.

but as soon as X takes over, the screen fallback to portrait.

xfce panel do not have any option other than "normal" for orientation.

video is intel vga (no other detail)

xrandr --output default --rotate left

fails with "cannot use rotation left"

I could add a mode 1280x800 following

http://dodin.info/wiki/pmwiki.php?n=Doc.AddXResolution

but with "configure crtc 0 failed"

any hint?

thanks
jdd

Sven Arvidsson

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Feb 21, 2016, 12:40:06 PM2/21/16

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Can you double check that you're really running the Xorg intel driver
and isn't getting fbdev or something similar?

From what I can tell the rotate commands should work on other Bay Trail
tablets running Linux, but with your manual framebuffer configuration
I'm unsure if KMS and the intel driver would work?

--
Cheers,
Sven Arvidsson
http://www.whiz.se
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jdd

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Feb 21, 2016, 12:50:06 PM2/21/16

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Le 21/02/2016 18:37, Sven Arvidsson a écrit :

> Can you double check that you're really running the Xorg intel driver
> and isn't getting fbdev or something similar?

don't know, because it do not start with the default grub config. I have
to add nomodeset or i915.modeset=0 to have a display, including console

with

fbcon=rotate:1

in the grub linux line, I have finally a *terminal only* landscape
oriented screen (with target multi-users in systemd).

BUT

the boot menu is still portrait

if I run startxfce4, it comes with portrait orientation.

jdd

jdd

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Feb 21, 2016, 1:00:06 PM2/21/16

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forgot to say I can connect to the tablet with ssh, so I can see the
logs, but with no clue (for me)

jdd

Felix Miata

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Feb 21, 2016, 1:40:04 PM2/21/16

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jdd composed on 2016-02-21 18:46 (UTC+0100):

>> Can you double check that you're really running the Xorg intel driver
>> and isn't getting fbdev or something similar?

> don't know, because it do not start with the default grub config. I have
> to add nomodeset or i915.modeset=0 to have a display, including console

Intel driver for Xorg, same as radeon and nouveau, absolutely depends on
keeping KMS enabled. those startup parameters are for proprietary NVidia
users, and users satisfied with the crippled functionality of fbdev and vesa
drivers (IOW, troubleshooting/temporary boots).
--
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)

Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata *** http://fm.no-ip.com/

Sven Arvidsson

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Feb 21, 2016, 2:00:05 PM2/21/16

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On Sun, 2016-02-21 at 18:49 +0100, jdd wrote:
> forgot to say I can connect to the tablet with ssh, so I can see the
> logs, but with no clue (for me)

Xorg logs should be in /var/log/Xorg.0.log in jessie. you can post it
here if you need help understanding it.

If KMS doesn't work at all, it might be that jessie is just too old to
support that hardware. but that's just another guess.

I also suggest that you document your efforts on getting Debian to run
here: https://wiki.debian.org/InstallingDebianOn/

Both the stuff that works, and the stuff that doesn't.

jdd

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Feb 22, 2016, 4:00:07 AM2/22/16

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Le 21/02/2016 19:49, Sven Arvidsson a écrit :

> I also suggest that you document your efforts on getting Debian to run
> here: https://wiki.debian.org/InstallingDebianOn/
>
> Both the stuff that works, and the stuff that doesn't.
>

I will, after having investigated a bit more :-)

I was worried to notice the bug is still there when booting as
multi-user, that is with no X, and this was confirmed this morning,
there are no X recent logs.

so I looked at the kernel logs and noticed a crash:

http://dodin.org/owncloud/index.php/s/PzRjuxtZHKbMwzK

that seems to be a known issue, with some fixes, but I do not really
understand what I have to do to apply the fixes :-(

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1492632

https://bugs.launchpad.net/mesa/+bug/1274315

any way to do this on the grub kernel command line?

https://wiki.debian.org/KernelModesetting#Intel_GfxCards

thanks
jdd