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Old 11-09-2011, 11:55 PM
Taylor Hedberg
 
Default Display issues with Linux 3.1

Since updating to Linux 3.1 yesterday, I've been having strange problems
with the display on my laptop. The first reboot after updating the
kernel went normally, but every subsequent boot since then has had
problems.

This is a Dell Latitude D620 laptop with the following graphics-related
lines in the lspci output:

00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)

During boot, at the stage where it says "Waiting for UDev uevents to be
processed", the backlight normally blinks and the display mode changes,
presumably due to udev detecting my graphics hardware.

Since the kernel update, the backlight still blinks off momentarily, but
when it comes back on, the screen remains blank. Rather than seeing the
rest of the boot messages, the display is just black (but backlit). The
system still seems to boot like normal; I boot to the virtual console
rather than starting X automatically, and once the hard disk activity
stops after booting, I can blindly type my login credentials and issue
shell commands, though I still can't see any output.

Additionally, after the first reboot following the update (which did not
have the aforementioned display problems), I had issues with the display
backlight after starting X. If I shut the laptop lid, the backlight
usually shuts off, and comes back on when I reopen it. However, after
the kernel update, around 80% of the time, the backlight seemed to come
back on at about a third of its usual brightness. I had to close and
reopen it several times, and eventually it would come on at full power
like normal.

I managed to boot the system in single-user mode using the fallback
initcpio image (any other combination of boot options seemed to result
in the blank screen), and then downgraded the kernel back to 3.0.7.
After downgrading, all of these problems seem to have disappeared.

I've scanned through dmesg output and I don't really see anything out of
the ordinary. But I admit that I don't really know what I'm looking for.
Any thoughts or suggestions?
 
Old 11-10-2011, 05:45 AM
Uli Armbruster
 
Default Display issues with Linux 3.1

* Taylor Hedberg <tmhedberg@gmail.com> [10.11.2011 01:55]:
> Since updating to Linux 3.1 yesterday, I've been having strange problems
> with the display on my laptop. The first reboot after updating the
> kernel went normally, but every subsequent boot since then has had
> problems.
>
> This is a Dell Latitude D620 laptop with the following graphics-related
> lines in the lspci output:
>
> 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
> 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
>
> During boot, at the stage where it says "Waiting for UDev uevents to be
> processed", the backlight normally blinks and the display mode changes,
> presumably due to udev detecting my graphics hardware.
>
> Since the kernel update, the backlight still blinks off momentarily, but
> when it comes back on, the screen remains blank. Rather than seeing the
> rest of the boot messages, the display is just black (but backlit). The
> system still seems to boot like normal; I boot to the virtual console
> rather than starting X automatically, and once the hard disk activity
> stops after booting, I can blindly type my login credentials and issue
> shell commands, though I still can't see any output.
>
> Additionally, after the first reboot following the update (which did not
> have the aforementioned display problems), I had issues with the display
> backlight after starting X. If I shut the laptop lid, the backlight
> usually shuts off, and comes back on when I reopen it. However, after
> the kernel update, around 80% of the time, the backlight seemed to come
> back on at about a third of its usual brightness. I had to close and
> reopen it several times, and eventually it would come on at full power
> like normal.
>
> I managed to boot the system in single-user mode using the fallback
> initcpio image (any other combination of boot options seemed to result
> in the blank screen), and then downgraded the kernel back to 3.0.7.
> After downgrading, all of these problems seem to have disappeared.
>
> I've scanned through dmesg output and I don't really see anything out of
> the ordinary. But I admit that I don't really know what I'm looking for.
> Any thoughts or suggestions?

I can confirm this behavior, however I'm not sure if it's software related. I have the impression that this happens here only if the laptop is cold (e.g. because I carried it around outside in the cold german autumn). But Taylor's describtion fits perfectly to the behavior I have, so maybe it really is caused by the kernel.

I have a
01:00.0 VGA compatible controller: ATI Technologies Inc RV350 [Mobility Radeon 9600 M10]
and use the radeon driver.
 
Old 11-10-2011, 08:42 AM
Thomas Bächler
 
Default Display issues with Linux 3.1

Am 10.11.2011 07:45, schrieb Uli Armbruster:
> * Taylor Hedberg <tmhedberg@gmail.com> [10.11.2011 01:55]:
>> 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
>> 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
> I have a
> 01:00.0 VGA compatible controller: ATI Technologies Inc RV350 [Mobility Radeon 9600 M10]
> and use the radeon driver.

Those are completely different chips and different drivers, I would be
surprised to see any connection here.

I'm afraid I can't tell you anything about this problem, besides the
usual "works fine for me" answer, at least in the case of the 'intel'
driver.

00:02.0 VGA compatible controller: Intel Corporation Core Processor
Integrated Graphics Controller (rev 12)
 
Old 11-10-2011, 08:51 AM
Cédric Girard
 
Default Display issues with Linux 3.1

Have you tried playing with KMS, see if it changes anything enabling or
disabling it?

--
Cédric Girard
 
Old 11-10-2011, 11:50 AM
Taylor Hedberg
 
Default Display issues with Linux 3.1

Uli Armbruster, Thu 2011-11-10 @ 07:45:11+0100:
> I can confirm this behavior, however I'm not sure if it's software
> related. I have the impression that this happens here only if the
> laptop is cold (e.g. because I carried it around outside in the cold
> german autumn). But Taylor's describtion fits perfectly to the
> behavior I have, so maybe it really is caused by the kernel.
>
> I have a 01:00.0 VGA compatible controller: ATI Technologies Inc RV350
> [Mobility Radeon 9600 M10] and use the radeon driver.

Does the problem disappear if you downgrade the kernel? It certainly
does for me. That would tell you whether it's hardware or software issue
on your machine.
 
Old 11-10-2011, 12:53 PM
Uli Armbruster
 
Default Display issues with Linux 3.1

* Taylor Hedberg <tmhedberg@gmail.com> [10.11.2011 13:50]:
> Uli Armbruster, Thu 2011-11-10 @ 07:45:11+0100:
> > I can confirm this behavior, however I'm not sure if it's software
> > related. I have the impression that this happens here only if the
> > laptop is cold (e.g. because I carried it around outside in the cold
> > german autumn). But Taylor's describtion fits perfectly to the
> > behavior I have, so maybe it really is caused by the kernel.
> >
> > I have a 01:00.0 VGA compatible controller: ATI Technologies Inc RV350
> > [Mobility Radeon 9600 M10] and use the radeon driver.
>
> Does the problem disappear if you downgrade the kernel? It certainly
> does for me. That would tell you whether it's hardware or software issue
> on your machine.

I'll try to look into it. I also have the linux-rt kernel installed, which is still version 3.0.7. I'll tell you if it happens as well with this kernel.
 
Old 11-10-2011, 01:00 PM
Mauro Santos
 
Default Display issues with Linux 3.1

On 10-11-2011 06:45, Uli Armbruster wrote:

* Taylor Hedberg<tmhedberg@gmail.com> [10.11.2011 01:55]:

Since updating to Linux 3.1 yesterday, I've been having strange problems
with the display on my laptop. The first reboot after updating the
kernel went normally, but every subsequent boot since then has had
problems.

This is a Dell Latitude D620 laptop with the following graphics-related
lines in the lspci output:

00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)

During boot, at the stage where it says "Waiting for UDev uevents to be
processed", the backlight normally blinks and the display mode changes,
presumably due to udev detecting my graphics hardware.

Since the kernel update, the backlight still blinks off momentarily, but
when it comes back on, the screen remains blank. Rather than seeing the
rest of the boot messages, the display is just black (but backlit). The
system still seems to boot like normal; I boot to the virtual console
rather than starting X automatically, and once the hard disk activity
stops after booting, I can blindly type my login credentials and issue
shell commands, though I still can't see any output.

Additionally, after the first reboot following the update (which did not
have the aforementioned display problems), I had issues with the display
backlight after starting X. If I shut the laptop lid, the backlight
usually shuts off, and comes back on when I reopen it. However, after
the kernel update, around 80% of the time, the backlight seemed to come
back on at about a third of its usual brightness. I had to close and
reopen it several times, and eventually it would come on at full power
like normal.

I managed to boot the system in single-user mode using the fallback
initcpio image (any other combination of boot options seemed to result
in the blank screen), and then downgraded the kernel back to 3.0.7.
After downgrading, all of these problems seem to have disappeared.

I've scanned through dmesg output and I don't really see anything out of
the ordinary. But I admit that I don't really know what I'm looking for.
Any thoughts or suggestions?


I can confirm this behavior, however I'm not sure if it's software related. I have the impression that this happens here only if the laptop is cold (e.g. because I carried it around outside in the cold german autumn). But Taylor's describtion fits perfectly to the behavior I have, so maybe it really is caused by the kernel.

I have a
01:00.0 VGA compatible controller: ATI Technologies Inc RV350 [Mobility Radeon 9600 M10]
and use the radeon driver.



Works fine for me here after a few reboots/cold boot/hibernate. I'm
using the radeon driver with:
01:00.0 VGA compatible controller: ATI Technologies Inc Mobility Radeon
HD 2400


--
Mauro Santos
 
Old 11-10-2011, 02:36 PM
Sebastian Schwarz
 
Default Display issues with Linux 3.1

Hello,

On 2011-11-09 at 19:55 -0500, Taylor Hedberg wrote:
> This is a Dell Latitude D620 laptop with the following
> graphics-related lines in the lspci output:
>
> 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
> 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)

I have a Dell Latitude D420 with the same card.

> Since the kernel update, the backlight still blinks off
> momentarily, but when it comes back on, the screen remains
> blank. Rather than seeing the rest of the boot messages, the
> display is just black (but backlit). The system still seems to
> boot like normal; I boot to the virtual console rather than
> starting X automatically, and once the hard disk activity
> stops after booting, I can blindly type my login credentials
> and issue shell commands, though I still can't see any output.

I do not have this problem, however this sounds familiar:

> If I shut the laptop lid, the backlight usually shuts off,
> and comes back on when I reopen it. However, after the kernel
> update, around 80% of the time, the backlight seemed to come
> back on at about a third of its usual brightness. I had to
> close and reopen it several times, and eventually it would
> come on at full power like normal.

My display comes back with the minimal brightness setting.
Also the XF86MonBrightnessUp (Fn+Up) and XF86MonBrightnessDown
(Fn+Down) buttons stopped working. I can restore the previous
brightness level and the buttons by running:

cat /sys/class/backlight/intel_backlight/max_brightness
> /sys/class/backlight/intel_backlight/brightness

The bug can easily triggered in X by running:

xset dpms force off

> After downgrading, all of these problems seem to have
> disappeared.

I haven't bothered to downgrade the kernel yet.

> I've scanned through dmesg output and I don't really see
> anything out of the ordinary. But I admit that I don't really
> know what I'm looking for. Any thoughts or suggestions?

I found this I my dmesg output:

[Firmware Bug]: Duplicate ACPI video bus devices for
the same VGA controller, please try module parameter
"video.allow_duplicates=1"if the current driver doesn't
work.

But I also haven't tried this, as the incorrect brightness has
not annoyed me enough, yet.

Regards,
Sebastian
 
Old 11-10-2011, 06:29 PM
"David C. Rankin"
 
Default Display issues with Linux 3.1

On 11/09/2011 06:55 PM, Taylor Hedberg wrote:

Additionally, after the first reboot following the update (which did not
have the aforementioned display problems), I had issues with the display
backlight after starting X.


Just to add to the display discussion...

On an x86_64 (with nVidia), after 1st boot, the kdm login screen would not
power off (the 10 min. power-off that blanks the display if no login). I've
never seen this behavior before, but noticed it ~1 hour after booting as I
walked by the box. The login was just a big and bright as could be. I'm fairly
particular about checking because I don't want burn-in even though that has
largely been eliminated, I still check...


--
David C. Rankin, J.D.,P.E.
 
Old 11-10-2011, 06:48 PM
Mike Bishop
 
Default Display issues with Linux 3.1

On Wed, Nov 09, 2011 at 07:55:22PM -0500, Taylor Hedberg wrote:
> Since updating to Linux 3.1 yesterday, I've been having strange problems
> with the display on my laptop. The first reboot after updating the
> kernel went normally, but every subsequent boot since then has had
> problems.
>
> This is a Dell Latitude D620 laptop with the following graphics-related
> lines in the lspci output:
>
> 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
> 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
>
> During boot, at the stage where it says "Waiting for UDev uevents to be
> processed", the backlight normally blinks and the display mode changes,
> presumably due to udev detecting my graphics hardware.
>

<snip>

Same problem here, on an Asus laptop with Intel (945GM) graphics. Still
fiddling with it, but I can restore proper operation by starting
X then (ctl+alt+fn) moving to a tty. I start X by ssh'ing from
another machine.

I have another machine with intel (945G) graphics that does not have the
problem. But it's not a laptop. Next tests are to remove laptop
specific daemons from rc.conf to see if that helps (since both these
machines are almost identical in configuration).

Rgds,
--
Mike Bishop
Willow, Alaska
 

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