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#1 2013-03-16 23:09:57

ewaller
Administrator
From: Pasadena, CA
Registered: 2009-07-13
Posts: 19,739

Intel Graphics Default Reolution is not the Native Display Resolution

This one popped up after yesterdays system upgrade. 

The "Interesting" lines from my pacman log.

[2013-03-15 19:31] Running 'pacman -Syu'
...
[2013-03-15 19:48] upgraded filesystem (2013.01-3 -> 2013.03-2)
...
[2013-03-15 19:48] upgraded mesa (9.1-2 -> 9.1-3)
[2013-03-15 19:48] upgraded mesa-libgl (9.1-2 -> 9.1-3)
[2013-03-15 19:48] upgraded intel-dri (9.1-2 -> 9.1-3)
...
[2013-03-15 19:49] upgraded linux (3.8.2-1 -> 3.8.3-1)
[2013-03-15 19:49] upgraded linux-docs (3.8.2-1 -> 3.8.3-1)
[2013-03-15 19:50] upgraded linux-headers (3.8.2-1 -> 3.8.3-1)
....
[2013-03-15 19:51] upgraded xf86-input-evdev (2.7.3-2 -> 2.7.3-3)
[2013-03-15 19:51] upgraded xf86-input-joystick (1.6.2-1 -> 1.6.2-2)
[2013-03-15 19:51] upgraded xf86-input-keyboard (1.6.2-2 -> 1.6.2-3)
[2013-03-15 19:51] upgraded xf86-input-mouse (1.8.1-2 -> 1.8.1-3)
[2013-03-15 19:51] upgraded xf86-input-synaptics (1.6.3-1 -> 1.6.3-2)
[2013-03-15 19:51] upgraded xf86-input-void (1.4.0-4 -> 1.4.0-5)
[2013-03-15 19:51] upgraded xf86-video-intel (2.21.3-1 -> 2.21.4-1)
[2013-03-15 19:51] upgraded xfdesktop (4.10.1-2 -> 4.10.2-1)
[2013-03-15 19:51] upgraded xorg-server-common (1.13.3-1 -> 1.14.0-2)
[2013-03-15 19:51] upgraded xorg-server (1.13.3-1 -> 1.14.0-2)
[2013-03-15 19:51] upgraded xorg-server-devel (1.13.3-1 -> 1.14.0-2)

Interesting lines from Xorg.0.log:

....
[  7964.250] (II) intel(0): Printing probed modes for output LVDS1
[  7964.250] (II) intel(0): Modeline "1280x800"x60.0   69.29  1280 1319 1345 1410  800 802 806 819 -hsync -vsync (49.1 kHz eP)
[  7964.250] (II) intel(0): Modeline "1024x768"x60.0   65.00  1024 1048 1184 1344  768 771 777 806 -hsync -vsync (48.4 kHz d)
[  7964.250] (II) intel(0): Modeline "800x600"x60.3   40.00  800 840 968 1056  600 601 605 628 +hsync +vsync (37.9 kHz d)
[  7964.250] (II) intel(0): Modeline "800x600"x56.2   36.00  800 824 896 1024  600 601 603 625 +hsync +vsync (35.2 kHz d)
[  7964.250] (II) intel(0): Modeline "640x480"x59.9   25.18  640 656 752 800  480 490 492 525 -hsync -vsync (31.5 kHz d)
[  7964.269] (II) intel(0): EDID for output VGA1
[  7964.269] (II) intel(0): Printing probed modes for output VGA1
[  7964.269] (II) intel(0): Modeline "1024x768"x60.0   65.00  1024 1048 1184 1344  768 771 777 806 -hsync -vsync (48.4 kHz e)
[  7964.269] (II) intel(0): Modeline "800x600"x60.3   40.00  800 840 968 1056  600 601 605 628 +hsync +vsync (37.9 kHz e)
[  7964.269] (II) intel(0): Modeline "800x600"x56.2   36.00  800 824 896 1024  600 601 603 625 +hsync +vsync (35.2 kHz e)
[  7964.269] (II) intel(0): Modeline "848x480"x60.0   33.75  848 864 976 1088  480 486 494 517 +hsync +vsync (31.0 kHz e)
[  7964.269] (II) intel(0): Modeline "640x480"x59.9   25.18  640 656 752 800  480 489 492 525 -hsync -vsync (31.5 kHz e)
....
[  7964.270] (II) intel(0): Using fuzzy aspect match for initial modes
[  7964.270] (II) intel(0): Output LVDS1 using initial mode 1024x768
[  7964.270] (II) intel(0): Output VGA1 using initial mode 1024x768
...

And X opens with a resolution of 1024x768 on an LCD with a native resolution of 1280x800.  Bad form.
I do not have any Xorg configuration files related to the display/monitor/screen.  I do have files that set up my trackpad and accelerometer.

Until yesterday, this just worked.  I can change to 1280x800 using xrandr, but that is a hassle.

Is this a bug? Has anyone else seen this? 

I do not want to have to create custom configurations, but I can.  If this is a known problem, I think I can work around it by adding a couple incantations to my ~/.xinitrc.

Anything I can pass into the intel driver from a command line to make it prefer 16:9 to 4:3 ?
Any opinions as to whether this is an Xorg bug, or an intel driver bug? 

Thanks in advance.


Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way

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#2 2013-03-16 23:52:55

crondog
Member
Registered: 2011-04-21
Posts: 130

Re: Intel Graphics Default Reolution is not the Native Display Resolution

I have the same problem with my desktop with my HDMI1 and HDMI2. I think it is this bug https://bugs.freedesktop.org/show_bug.cgi?id=61861. I am currently using xrandr to get around it

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#3 2013-03-17 00:26:27

ewaller
Administrator
From: Pasadena, CA
Registered: 2009-07-13
Posts: 19,739

Re: Intel Graphics Default Reolution is not the Native Display Resolution

Well, at least I am not alone smile  I agree, that looks like that bug is exactly what I am seeing.

Now that you mention it, This may be in the wrong place.  I think this is the kernel from testing. I'll get back shortly...


Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way

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#4 2013-03-17 00:35:03

WonderWoofy
Member
From: Los Gatos, CA
Registered: 2012-05-19
Posts: 8,414

Re: Intel Graphics Default Reolution is not the Native Display Resolution

Yeah, there was a bunch of stuff on the mailing lists about 3.8.* doing funky things with graphics.  Personally I am using 3.8.3-1-ck from graysky and don't have this issue whatsoever.  But I do recall seeing this predominantly with HD3000 Intel graphics, and mine is HD4000.  So maybe this is why... I'm really not sure.

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#5 2013-03-17 00:39:51

ewaller
Administrator
From: Pasadena, CA
Registered: 2009-07-13
Posts: 19,739

Re: Intel Graphics Default Reolution is not the Native Display Resolution

Yeah, turning off testing thus backing off of the 3.8 kernel and the old behavior is back.

Moving to testing....


Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way

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#6 2013-03-21 01:18:21

fawkes5
Member
From: Canada
Registered: 2012-12-23
Posts: 84

Re: Intel Graphics Default Reolution is not the Native Display Resolution

ewaller wrote:

Yeah, turning off testing thus backing off of the 3.8 kernel and the old behavior is back.

Moving to testing....

I'm having the same issue after upgrading to 3.8. What exactly did you do to fix? I'm not using the kernel from testing.

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#7 2013-03-21 01:31:16

ewaller
Administrator
From: Pasadena, CA
Registered: 2009-07-13
Posts: 19,739

Re: Intel Graphics Default Reolution is not the Native Display Resolution

I am running the 3.7.10-1 kernel.  I just checked, and it looks like updated on 3/18.  I've not updated since then.
At this point, the easiest thing to do is back down to the 3.7 kernel.  That, or work around it until it is fixed.

<Moderator> I am moving this thread back to 'Kernel and Hardware'  </moderator>

Sorry I can't be more helpful sad


Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way

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#8 2013-03-22 04:05:16

ewaller
Administrator
From: Pasadena, CA
Registered: 2009-07-13
Posts: 19,739

Re: Intel Graphics Default Reolution is not the Native Display Resolution

Well, I just threw caution to the wind and upgraded.  This time around, the fuzzy aspect ratio artifact is gone hmm

To recap, I had problems as of my original post:

ewaller wrote:

...
The "Interesting" lines from my pacman log.

[2013-03-15 19:31] Running 'pacman -Syu'
...
[2013-03-15 19:48] upgraded filesystem (2013.01-3 -> 2013.03-2)
...
[2013-03-15 19:48] upgraded mesa (9.1-2 -> 9.1-3)
[2013-03-15 19:48] upgraded mesa-libgl (9.1-2 -> 9.1-3)
[2013-03-15 19:48] upgraded intel-dri (9.1-2 -> 9.1-3)
...
[2013-03-15 19:49] upgraded linux (3.8.2-1 -> 3.8.3-1)
[2013-03-15 19:49] upgraded linux-docs (3.8.2-1 -> 3.8.3-1)
[2013-03-15 19:50] upgraded linux-headers (3.8.2-1 -> 3.8.3-1)
....
[2013-03-15 19:51] upgraded xf86-input-evdev (2.7.3-2 -> 2.7.3-3)
[2013-03-15 19:51] upgraded xf86-input-joystick (1.6.2-1 -> 1.6.2-2)
[2013-03-15 19:51] upgraded xf86-input-keyboard (1.6.2-2 -> 1.6.2-3)
[2013-03-15 19:51] upgraded xf86-input-mouse (1.8.1-2 -> 1.8.1-3)
[2013-03-15 19:51] upgraded xf86-input-synaptics (1.6.3-1 -> 1.6.3-2)
[2013-03-15 19:51] upgraded xf86-input-void (1.4.0-4 -> 1.4.0-5)
[2013-03-15 19:51] upgraded xf86-video-intel (2.21.3-1 -> 2.21.4-1)
[2013-03-15 19:51] upgraded xfdesktop (4.10.1-2 -> 4.10.2-1)
[2013-03-15 19:51] upgraded xorg-server-common (1.13.3-1 -> 1.14.0-2)
[2013-03-15 19:51] upgraded xorg-server (1.13.3-1 -> 1.14.0-2)
[2013-03-15 19:51] upgraded xorg-server-devel (1.13.3-1 -> 1.14.0-2)

...

Today's upgrade (again, only the 'interesting' lines):

[2013-03-21 20:00] starting full system upgrade
[2013-03-21 20:10] upgraded mesa (9.1-3 -> 9.1.1-1)
[2013-03-21 20:10] upgraded mesa-libgl (9.1-3 -> 9.1.1-1)
[2013-03-21 20:10] upgraded intel-dri (9.1-3 -> 9.1.1-1)
[2013-03-21 20:11] upgraded linux (3.7.10-1 -> 3.8.3-2)
[2013-03-21 20:11] upgraded linux-docs (3.7.10-1 -> 3.8.3-2)
[2013-03-21 20:11] upgraded linux-headers (3.7.10-1 -> 3.8.3-2)
[2013-03-21 20:12] upgraded xf86-input-evdev (2.7.3-2 -> 2.7.3-3)
[2013-03-21 20:12] upgraded xf86-input-joystick (1.6.2-1 -> 1.6.2-2)
[2013-03-21 20:12] upgraded xf86-input-keyboard (1.6.2-2 -> 1.6.2-3)
[2013-03-21 20:12] upgraded xf86-input-mouse (1.8.1-2 -> 1.8.1-3)
[2013-03-21 20:12] upgraded xf86-input-synaptics (1.6.3-1 -> 1.6.3-2)
[2013-03-21 20:12] upgraded xf86-input-void (1.4.0-4 -> 1.4.0-5)
[2013-03-21 20:12] upgraded xf86-video-intel (2.21.3-1 -> 2.21.4-1)
[2013-03-21 20:12] upgraded xine-lib (1.2.2-7 -> 1.2.2-8)
[2013-03-21 20:12] upgraded xorg-server-common (1.13.3-1 -> 1.14.0-2)
[2013-03-21 20:12] upgraded xorg-server (1.13.3-1 -> 1.14.0-2)
[2013-03-21 20:12] upgraded xorg-server-devel (1.13.3-1 -> 1.14.0-2)

Edit:  Might I suggest to anyone following this that you try upgrading again?  I'll wait to tag this as solved until I see some feedback.

Last edited by ewaller (2013-03-22 04:07:17)


Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way

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#9 2013-03-22 04:08:05

WonderWoofy
Member
From: Los Gatos, CA
Registered: 2012-05-19
Posts: 8,414

Re: Intel Graphics Default Reolution is not the Native Display Resolution

That is rather funky... as it appears to be nearly identical, though the kernel is one pkgrel higher.

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#10 2013-03-22 04:28:24

ewaller
Administrator
From: Pasadena, CA
Registered: 2009-07-13
Posts: 19,739

Re: Intel Graphics Default Reolution is not the Native Display Resolution

mesa and intel-dri went from 9.1 to 9.1.1 
I suspect therein lays the answer.


Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way

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#11 2013-03-25 05:10:49

fawkes5
Member
From: Canada
Registered: 2012-12-23
Posts: 84

Re: Intel Graphics Default Reolution is not the Native Display Resolution

So the funky aspect ratio thing went away, but your resolution is still not being set properly?

I upgraded as well and nothing changed for me.

Last edited by fawkes5 (2013-03-25 05:11:07)

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#12 2013-03-25 08:32:11

hazard
Member
Registered: 2011-07-04
Posts: 15

Re: Intel Graphics Default Reolution is not the Native Display Resolution

Any idea which package(s) caused this regression?

I wiped my package cache, so I guess it's a trip to the Arch Rollback Machine for me.

EDIT: BTW, I don't have any of the testing repos enabled.

Last edited by hazard (2013-03-25 08:34:27)

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#13 2013-03-25 09:35:38

hazard
Member
Registered: 2011-07-04
Posts: 15

Re: Intel Graphics Default Reolution is not the Native Display Resolution

(FYI, I'm using an ATI GPU with the Radeon driver on i686, so it's not just Intel GPUs that are affected)

I used a binary search via the Arch Rollback Machine repos to determine the package that causes this regression.

It is linux-3.8.3-2 released into the core repo on 2013-03-17.
Reverting to linux 3.7.10-1 and rebooting fixes the problem, no other packages seem to be affected.

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#14 2013-03-25 10:13:23

hazard
Member
Registered: 2011-07-04
Posts: 15

Re: Intel Graphics Default Reolution is not the Native Display Resolution

BTW just tested with linux-3.8.4-1 from testing and the problem still isn't fixed.

Still auto-selecting 1024x768 instead of the max, 1280x960 resolution (actually 1280x1024 is my max, both are at 60.0 Hz though).
For now I've set IgnorePkg=linux in pacman.conf to keep kernel 3.7.10 while keeping the rest up to date.

Need to inform one of the ArchLinux maintainers about this. I'm gonna take a look at the PKGBUILDs to see if anything has changed, otherwise someone will need to do a git bisect to determine what has changed upstream.

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#15 2013-03-25 13:17:22

ewaller
Administrator
From: Pasadena, CA
Registered: 2009-07-13
Posts: 19,739

Re: Intel Graphics Default Reolution is not the Native Display Resolution

fawkes5 wrote:

So the funky aspect ratio thing went away, but your resolution is still not being set properly?

I upgraded as well and nothing changed for me.

Yes, I am getting the native resolution of my panel.  I'll not be marking this thread as solved just yet.


Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way

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#16 2013-03-26 02:25:03

fawkes5
Member
From: Canada
Registered: 2012-12-23
Posts: 84

Re: Intel Graphics Default Reolution is not the Native Display Resolution

It's strange. If my second monitor is connected (VGA), then
the default resolution is not properly set. However, if
the monitor is not connected, then it is properly set. Whats
that all about?

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#17 2013-03-26 09:32:20

jacobopantoja
Member
From: Madrid
Registered: 2011-03-16
Posts: 44

Re: Intel Graphics Default Reolution is not the Native Display Resolution

Hello all,

Some questions:
1) Could you check in your /sys/class/drm/cardX-XXXX/{modes,edid} what do you have? (Note: edid is binary, but it is expected to give you something instead of nothing)
2) Is the problem affecting only your Xorg or also your console?
3) Is anyone having this problem with nouveau?

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#18 2013-03-26 11:09:29

Gusar
Member
Registered: 2009-08-25
Posts: 3,605

Re: Intel Graphics Default Reolution is not the Native Display Resolution

X by default sets the resolution to the highest both displays support. So either the second monitor's max resolution is 1024x768, or X doesn't receive that monitor's EDID. In the latter case, try a different cable. In the former, if you want something different that the X default, configure it: https://wiki.archlinux.org/index.php/Du … .conf_file

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#19 2013-03-28 06:11:02

fawkes5
Member
From: Canada
Registered: 2012-12-23
Posts: 84

Re: Intel Graphics Default Reolution is not the Native Display Resolution

jacobopantoja wrote:

Hello all,

Some questions:
1) Could you check in your /sys/class/drm/cardX-XXXX/{modes,edid} what do you have? (Note: edid is binary, but it is expected to give you something instead of nothing)
2) Is the problem affecting only your Xorg or also your console?
3) Is anyone having this problem with nouveau?

1) For my laptop screen i get

cat edid 
ÿÿÿÿÿÿ0äx
úåXV( PThP0  5%¥þLG Display
  þLP133WH2-TLL1l%
cat modes 
1366x768

2) Only in Xorg
3) i'm use intel drivers.

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#20 2013-03-28 09:40:21

hazard
Member
Registered: 2011-07-04
Posts: 15

Re: Intel Graphics Default Reolution is not the Native Display Resolution

Maybe I should post in a new thread, however, I'm fairly certain it's the same bug.


This issue only affects X not VTs (AFAICT).
To sum up with >=3.8 my default is 1024x768 and only a few modes, with <=3.7 my default is 1280x960 and a lot of modes.


Machine 1: old ATI card with Radeon driver, only one monitor plugged in, a CRT with VGA.

Using linux-3.7.10-1 from Arch Rollback Machine:

$ strings /sys/class/drm/card*/edid
564D
HO%j
aYEY1Y
      
930CD61SD465
COMPAQ S700
$ cat /sys/class/drm/card*/modes
1280x1024
1280x960
1280x800
1280x800
1152x864
1280x768
1280x768
1280x768
1024x768
1024x768
1024x768
1024x768
1024x768i
832x624
800x600
800x600
800x600
800x600
800x600
848x480
640x480
640x480
640x480
640x480
720x400
640x400
640x350
$ xrandr
Screen 0: minimum 320 x 200, current 1280 x 960, maximum 4096 x 4096
VGA-0 connected 1280x960+0+0 (normal left inverted right x axis y axis) 310mm x 232mm
   1280x1024      60.0  
   1280x960       60.0* 
   1280x800       74.9     59.8  
   1152x864       75.0  
   1280x768       84.8     74.9     59.9  
   1024x768       85.0     75.1     70.1     60.0  
   1024x768i      87.1  
   832x624        74.6  
   800x600        85.1     72.2     75.0     60.3     56.2  
   848x480        60.0  
   640x480        85.0     72.8     75.0     60.0  
   720x400        85.0  
   640x400        85.1  
   640x350        85.1

----------------------------------------------------

Using linux-3.8.4-1 from [core] (identical output with linux-mainline-3.9rc4-1 from https://arch.miffe.org):

$ strings /sys/class/drm/card*/edid
564D
HO%j
aYEY1Y
      
930CD61SD465
COMPAQ S700
$ cat /sys/class/drm/card*/modes
1280x1024
1024x768
1024x768
1024x768
832x624
800x600
800x600
800x600
640x480
640x480
640x480
640x350
$ xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 4096 x 4096
VGA-0 connected 1024x768+0+0 (normal left inverted right x axis y axis) 310mm x 232mm
   1280x1024      60.0  
   1024x768       85.0*    75.1     60.0  
   832x624        74.6  
   800x600        85.1     75.0     60.3  
   640x480        85.0     75.0     60.0  
   640x350        85.1  

As you can see the 3.7.X kernel has a lot more video modes exposed which allows a more sane automatic screen resolution than what is offered by 3.8.X/3.9.X.

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#21 2013-03-28 09:51:20

hazard
Member
Registered: 2011-07-04
Posts: 15

Re: Intel Graphics Default Reolution is not the Native Display Resolution

Machine 2: old Nvidia card with Nouveau driver, same install, same CRT monitor.

Using linux-3.7.10-1 from Arch Rollback Machine:

$ cat /sys/class/drm/card*/edid
ÿÿÿÿÿÿI564D     l! è VG$HO%jaYEY1YN
                                   À ^_ 6èý2 Fÿ
      ÿ930CD61SD465
üCOMPAQ S700
$ cat /sys/class/drm/card*/modes
1280x1024
1280x960
1280x800
1280x800
1152x864
1280x768
1280x768
1280x768
1024x768
1024x768
1024x768
1024x768
1024x768i
832x624
800x600
800x600
800x600
800x600
800x600
848x480
640x480
640x480
640x480
640x480
720x400
640x400
640x350
$ xrandr
Screen 0: minimum 320 x 200, current 1280 x 960, maximum 4096 x 4096
LVDS-1 disconnected (normal left inverted right x axis y axis)
VGA-1 connected 1280x960+0+0 (normal left inverted right x axis y axis) 310mm x 232mm
   1280x1024      60.0  
   1280x960       60.0* 
   1280x800       74.9     59.8  
   1152x864       75.0  
   1280x768       84.8     74.9     59.9  
   1024x768       85.0     75.1     70.1     60.0  
   1024x768i      87.1  
   832x624        74.6  
   800x600        85.1     72.2     75.0     60.3     56.2  
   848x480        60.0  
   640x480        85.0     72.8     75.0     60.0  
   720x400        85.0  
   640x400        85.1  
   640x350        85.1  
TV-1 disconnected (normal left inverted right x axis y axis)

-----------------------

Using linux-3.8.4-1 from [core]

$ cat /sys/class/drm/card*/edid
ÿÿÿÿÿÿI564D     l! è VG$HO%jaYEY1YN
                                   À ^_ 6èý2 Fÿ
      ÿ930CD61SD465
üCOMPAQ S700
$ cat /sys/class/drm/card*/modes
1280x1024
1024x768
1024x768
1024x768
832x624
800x600
800x600
800x600
640x480
640x480
640x480
640x350
$ xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 4096 x 4096
LVDS-1 disconnected (normal left inverted right x axis y axis)
VGA-1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 310mm x 232mm
   1280x1024      60.0  
   1024x768       85.0*    75.1     60.0  
   832x624        74.6  
   800x600        85.1     75.0     60.3  
   640x480        85.0     75.0     60.0  
   640x350        85.1  
TV-1 disconnected (normal left inverted right x axis y axis)

Same conclusion.

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#22 2013-03-28 10:23:34

jacobopantoja
Member
From: Madrid
Registered: 2011-03-16
Posts: 44

Re: Intel Graphics Default Reolution is not the Native Display Resolution

@Hazard:
1) Please do the following: build package edid-decode-git from AUR, and then run

$ edid-decode /sys/class/drm/card..../edid

and post the output. For me, it is clearly that the parsing of the EDID has changed between 3.7 and 3.8.

2) Make an md5sum of the EDID on both kernels, although very likely they will be the same (only as a sanity check).

3) To put in a nutshell: what resolutions are you getting in TTY and Xorg with each kernel?

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