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#1 2013-03-19 11:59:04

ewaves
Member
Registered: 2012-09-01
Posts: 37

LVDS not detected after kernel upgrade

Hi all!
Yesterday I updated my Mackbook 4,1 to the latest kernel but my laptop were booted with the integrated monitor disconnected.
I used it updated without problems until I turned it on without the external monitor, and I discovered that my LVDS is no more recognised.
At the moment I'm booting it using my external monitor and running "xrandr -q" actually doesn't show any LVDS.
I tried reinstalling the kernel, regenerating images with mkinitcpio, reinstalling intel graphic drivers, but nothing worked.
Any ideas?

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#2 2013-03-19 13:34:54

no1r
Member
Registered: 2012-06-14
Posts: 3

Re: LVDS not detected after kernel upgrade

The same problem occured on my laptop today.
In my case I've replaced xf86-video-intel-git with the xf86-video-intel pkg from extra, then added

acpi_backlight=vendor

to the kernel in grub.cfg.
After that I ran

mkinitcpio -p linux

and lvds was recognized after a reboot.

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#3 2013-03-20 09:53:53

ewaves
Member
Registered: 2012-09-01
Posts: 37

Re: LVDS not detected after kernel upgrade

no1r wrote:

The same problem occured on my laptop today.
In my case I've replaced xf86-video-intel-git with the xf86-video-intel pkg from extra, then added

acpi_backlight=vendor

to the kernel in grub.cfg.
After that I ran

mkinitcpio -p linux

and lvds was recognized after a reboot.

This changed absolutely nothing. I added "acpi_backlight=vendor" to my kernel line and did a mkinitcpio, reboot and nothing, same as before sad

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#4 2013-03-25 21:36:53

jumperpunk
Member
Registered: 2009-01-19
Posts: 19

Re: LVDS not detected after kernel upgrade

I've got the same problem as the OP. My problem started on the same day or the day after the OP. I'm using an AMD video card, so the bit about the Intel drivers is useless to me. It seems to be a problem with KMS. Things I've done to troubleshoot:
- disabling KMS (radeon.modeset=0 kernel parameter). This lets me boot using my laptop display, but has the obvious limitations of no KMS
- If I boot normally with an external monitor connected, I can use the external monitor just fine. xrandr shows DisplayPort-[0-2] and VGA, no LVDS. All 3 DisplayPorts and the VGA were there before LVDS disappeared.
- rolling back to an earlier kernel didnt help
- removed xf86-video-ati and installed xf86-video-vesa, nothing changed
- Lid state is correctly detected as 'open' at /proc/acpi/button/lid/LID/state

Some info about my pc:

$ lspci | grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Whistler XT [AMD Radeon HD 6700M Series]
$ uname -r
3.8.4-1-ARCH

Any thoughts?

Last edited by jumperpunk (2013-03-25 21:38:31)

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#5 2013-03-28 17:35:21

jumperpunk
Member
Registered: 2009-01-19
Posts: 19

Re: LVDS not detected after kernel upgrade

ewaves - are you using EFI boot? When I boot in legacy BIOS mode, everything works fine. When I boot in EFI mode, it breaks.

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#6 2013-04-04 16:18:37

ewaller
Administrator
From: Pasadena, CA
Registered: 2009-07-13
Posts: 12,393

Re: LVDS not detected after kernel upgrade

ewaves wrote:

Indeed it's a EFI boot!
Assuming what you stated it's a efi compatibility issue, it makes me wonder why it's only the two of us complaining about this.
Anyway downgrading to 3.7.X worked for me, but it's not a solution, and I hope someone with more kernel knowledge notices this thread.
PS sorry for the late answer, I didn't noticed the mail

Moderator:  In case you are wondering where your post went.....   You hit the 'report' link, not the 'reply' link.  It happens.


Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Like you, I have no idea what you are doing, but I am pretty sure it is wrong...Jasonwryan
----
How to Ask Questions the Smart Way

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#7 2013-04-04 17:54:33

hadrons123
Member
From: chennai
Registered: 2011-10-07
Posts: 1,249

Re: LVDS not detected after kernel upgrade

This is not arch specific. It happens in Debian experimental kernel, Fedora too. I do have this issue since 3.7 kernel and I have a intel HD4000 with nvidia 660m GTX. Filing a bug in ACPI zone in linux upstream is the way to go .

Last edited by hadrons123 (2013-04-04 17:55:53)


LENOVO Y 580 IVYBRIDGE 660M NVIDIA
Unix is user-friendly. It just isn't promiscuous about which users it's friendly with. - Steven King

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#8 2013-04-04 19:02:52

ewaves
Member
Registered: 2012-09-01
Posts: 37

Re: LVDS not detected after kernel upgrade

ewaller wrote:
ewaves wrote:

Indeed it's a EFI boot!
Assuming what you stated it's a efi compatibility issue, it makes me wonder why it's only the two of us complaining about this.
Anyway downgrading to 3.7.X worked for me, but it's not a solution, and I hope someone with more kernel knowledge notices this thread.
PS sorry for the late answer, I didn't noticed the mail

Moderator:  In case you are wondering where your post went.....   You hit the 'report' link, not the 'reply' link.  It happens.

Dammnit! Thank you so much, I intended to press "quote", haste and a not-so-well-working trackpad did the rest.

Anyway I suspected it wasn't arch related, thank you all for the answers! I'll see if I'm able to file a bug report, it's my first time smile

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#9 2013-04-05 00:51:52

hadrons123
Member
From: chennai
Registered: 2011-10-07
Posts: 1,249

Re: LVDS not detected after kernel upgrade

make sure you post your query in proper way.
Here is a guide.

https://www.kernel.org/pub/linux/docs/l … -bugs.html


LENOVO Y 580 IVYBRIDGE 660M NVIDIA
Unix is user-friendly. It just isn't promiscuous about which users it's friendly with. - Steven King

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#10 2013-04-17 18:01:16

jumperpunk
Member
Registered: 2009-01-19
Posts: 19

Re: LVDS not detected after kernel upgrade

ewaves wrote:

[...]
Anyway I suspected it wasn't arch related, thank you all for the answers! I'll see if I'm able to file a bug report, it's my first time smile

Have you filed a bug report for this? If so, can you post it here? Thanks!

Last edited by jumperpunk (2013-04-17 18:02:14)

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#11 2013-05-13 12:06:01

jumperpunk
Member
Registered: 2009-01-19
Posts: 19

Re: LVDS not detected after kernel upgrade

It looks like upgrading to the 3.9.2 kernel fixes the issue. I think I have had a few more kernel updates since I last tested it, but it definitely works with 3.9.2 (for me).

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#12 2013-05-13 12:17:27

picmantonic
Member
Registered: 2012-07-11
Posts: 13

Re: LVDS not detected after kernel upgrade

I have an iMac (radeon 4670) dual booting OSX and Arch (grub_efi and pure efi) on gpt disk (no hybrid MBR).
After upgrade to kernel 3.9.2 I get only black screen on Arch. Behaves like 'nomodeset' is ignored.
Same upgrade in virtualbox (efi enabled) works fine (uses vbox driver).

Last edited by picmantonic (2013-05-13 12:19:43)

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#13 2013-05-13 18:21:38

ewaves
Member
Registered: 2012-09-01
Posts: 37

Re: LVDS not detected after kernel upgrade

jumperpunk wrote:

It looks like upgrading to the 3.9.2 kernel fixes the issue. I think I have had a few more kernel updates since I last tested it, but it definitely works with 3.9.2 (for me).

3.9.X solved for me too big_smile

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