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 Post subject: R519: Kernel 3.0 with samsung-laptop module, & samsung-tools
PostPosted: 22/09/2011, 13:00 
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Joined: 22/09/2011, 11:08
Posts: 2
Hi there!

First of all, thank you, voRia, for this forum and for samsung-tools!

I tried Linux Mint Debian Edition (XFCE). While it worked, attempting to change the backlight would make the display flicker and X would become unstable.

So, after discovering your Samsung PPA, I tried Samsung Tools and Easy Slow Down Manager with Xubuntu 11.04 on this laptop, no problems there. But I found XFCE a bit basic after using GNOME 2 for a long time, so I decided I'd try KDE. As I've found using Kubuntu to be a horrible experience, I installed Arch Linux with KDE.

Arch Linux uses Kernel 3.0, like LMDE, I think. While using KDE, I noticed that attempting to change the brightness would again make the backlight flicker and the laptop unstable. I found, using the Internet, that adding "acpi_osi=Linux acpi_backlight=vendor" to the kernel's cmdline would fix this problem; I could now turn down my backlight without any problems.

Kernel 3.0 has a samsung-laptop module that replaces the now discontinued easy-slow-down-manager and samsung-backlight module. I found, however, that samsung-tools still expects the esdm module to get some of its work done. I hacked samsung-tools to use samsung-laptop to get stuff done. This is a hack because I removed the ESDM code in the process...

Some observations:
  • samsung-laptop's backlight code doesn't seem to let me blank the display (writing 0 to /sys/devices/platform/samsung/backlight/samsung/brightness just sets the screen to the lowest brightness) so I just force the use of vbetool, which does work
  • The fan interface is pretty much the same, except that /sys/devices/platform/samsung/performance_level actually returns the fan's status as a word: "normal, silent, overclock" (yes, overclock replaces speed)
  • Instead of ESDM's proc entry to disable Wi-Fi, rfkill is used instead. My R519 shows two devices when I "rfkill list wifi" (samsung-wifi and phy0); I block them both. While I can disable samsung-wifi only and stop the wireless, the Wi-Fi light remains on. I can disable phy0 only and the light will go off and the wifi will disable itself, but I'm not sure if samsung-wifi needs to be disabled as well...
  • I use a subprocess hack to get the rfkill device index for samsung-wifi, but I found later that you can look in /sys/devices/platform/samsung/rfkill/rfkill0/...

I've attached a tarball with a slightly modified PKGBUILD and the patch. One thing I have noticed is that under Arch Linux, "rc.d stop samsung-tools" will not do anything - "python2 /usr/lib/samsung-tools/system-service.py" and "python2 /usr/lib/samsung-tools/session-service.py" are still present in ps's output.

Also, this laptop has a Celeron T3100. When attempting to load some cpufreq modules, I get the following:
Quote:
[root@Arch ~]# uname -a
Linux Arch 3.0-pf #2 SMP PREEMPT Fri Sep 2 10:14:55 EEST 2011 x86_64 Celeron(R) Dual-Core CPU T3100 @ 1.90GHz GenuineIntel GNU/Linux
[root@Arch ~]# modprobe acpi-cpufreq
FATAL: Error inserting phc_intel (/lib/modules/3.0-pf/extra/phc-intel.ko): Input/output error
FATAL: Error inserting acpi_cpufreq (/lib/modules/3.0-pf/kernel/drivers/cpufreq/acpi-cpufreq.ko.gz): Input/output error
FATAL: Error running install command for acpi_cpufreq
[root@Arch ~]# modprobe p4-clockmod
FATAL: Error inserting p4_clockmod (/lib/modules/3.0-pf/kernel/drivers/cpufreq/p4-clockmod.ko.gz): Invalid argument


Is it a problem with the kernel, as http://aur.archlinux.org/packages.php?ID=24980 would suggest or does this Celeron really have no way of lowering its clock speed as pages on the Internet state? Thanks.


Attachments:
File comment: Hackish samsung-laptop modifications to samsung-tools
samsung-tools-bzr.tar [30 KiB]
Downloaded 304 times
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 Post subject: Re: R519: Kernel 3.0 with samsung-laptop module, & samsung-t
PostPosted: 01/10/2011, 16:36 
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Joined: 12/02/2009, 18:08
Posts: 1377
Location: Italy
Hi,
thanks for your work and experimentation with 'Samsung Tools' and the 'samsung-laptop' kernel module. A lot of useful informations here! ;)

Today I've installed a snapshot of the soon-to-be-released Kubuntu 11.10 and I've started to "play" with the new 'samsung-laptop' kernel module. Unfortunately, the first thing I've noticed is that it breaks the backlight control on my Samsung NC10. :(
The same happens also on other models, according to this bug report:

https://bugs.launchpad.net/ubuntu/+sour ... bug/810093

So, for now, I think the best viable option is yet to use 'samsung-backlight' and 'easy-slow-down-manager'.
As soon as the 'samsung-laptop' bug is fixed, I'll rewrite Samsung Tools to work with it.

Doobian wrote:
samsung-laptop's backlight code doesn't seem to let me blank the display (writing 0 to /sys/devices/platform/samsung/backlight/samsung/brightness just sets the screen to the lowest brightness) so I just force the use of vbetool, which does work

On my NC10, I can blank the display by writing 1 to /sys/devices/platform/samsung/backlight/samsung/bl_power (0 to re-enable it).

Doobian wrote:
One thing I have noticed is that under Arch Linux, "rc.d stop samsung-tools" will not do anything - "python2 /usr/lib/samsung-tools/system-service.py" and "python2 /usr/lib/samsung-tools/session-service.py" are still present in ps's output.

The rc.d script is not intended to start/stop the Samsung Tools services, its purpose is to set the initial status of devices at boot (and, as a consequence, it starts the system service). The session service is started when an user logs in and is stopped when the user logs out.

Doobian wrote:
Also, this laptop has a Celeron T3100. When attempting to load some cpufreq modules, I get the following:
Quote:
[root@Arch ~]# uname -a
Linux Arch 3.0-pf #2 SMP PREEMPT Fri Sep 2 10:14:55 EEST 2011 x86_64 Celeron(R) Dual-Core CPU T3100 @ 1.90GHz GenuineIntel GNU/Linux
[root@Arch ~]# modprobe acpi-cpufreq
FATAL: Error inserting phc_intel (/lib/modules/3.0-pf/extra/phc-intel.ko): Input/output error
FATAL: Error inserting acpi_cpufreq (/lib/modules/3.0-pf/kernel/drivers/cpufreq/acpi-cpufreq.ko.gz): Input/output error
FATAL: Error running install command for acpi_cpufreq
[root@Arch ~]# modprobe p4-clockmod
FATAL: Error inserting p4_clockmod (/lib/modules/3.0-pf/kernel/drivers/cpufreq/p4-clockmod.ko.gz): Invalid argument


Is it a problem with the kernel, as http://aur.archlinux.org/packages.php?ID=24980 would suggest or does this Celeron really have no way of lowering its clock speed as pages on the Internet state? Thanks.

I'm sorry but I can't help you here, I don't know if your CPU model is supported by PHC.
Try to ask on the linux-phc forum (http://www.linux-phc.org/), maybe someone there can help you.

_________________
Please consider a little donation to keep the 'Linux On My Samsung' project up and running. Thank you!


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 Post subject: Re: R519: Kernel 3.0 with samsung-laptop module, & samsung-t
PostPosted: 02/10/2011, 15:32 
Newbie
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Joined: 22/09/2011, 11:08
Posts: 2
voRia wrote:
Hi,
Today I've installed a snapshot of the soon-to-be-released Kubuntu 11.10 and I've started to "play" with the new 'samsung-laptop' kernel module. Unfortunately, the first thing I've noticed is that it breaks the backlight control on my Samsung NC10. :(
The same happens also on other models, according to this bug report:

https://bugs.launchpad.net/ubuntu/+sour ... bug/810093

So, for now, I think the best viable option is yet to use 'samsung-backlight' and 'easy-slow-down-manager'.
As soon as the 'samsung-laptop' bug is fixed, I'll rewrite Samsung Tools to work with it.


Have you tried booting with "acpi_osi=Linux acpi_backlight=vendor" appended to your kernel cmdline? It solves the problem for me :)

For what it's worth, even with samsung-laptop blacklisted and samsung-backlight loaded, I still had the backlight problem under Linux 3.0 but YMMV.

voRia wrote:
On my NC10, I can blank the display by writing 1 to /sys/devices/platform/samsung/backlight/samsung/bl_power (0 to re-enable it).


Ah, thank you! That works for me, too. I should've looked better...

voRia wrote:
The rc.d script is not intended to start/stop the Samsung Tools services, its purpose is to set the initial status of devices at boot (and, as a consequence, it starts the system service). The session service is started when an user logs in and is stopped when the user logs out.


Ah, fair enough. I actually have no reason to stop Samsung Tools under normal use, it was just when I was playing with it that I needed to do so.

voRia wrote:
I'm sorry but I can't help you here, I don't know if your CPU model is supported by PHC.
Try to ask on the linux-phc forum (http://www.linux-phc.org/), maybe someone there can help you.


Ah, thanks; will try there sometime. The BIOS has a power saving option depending on the state of the power adapter, maybe it does (somehow) do something. :)


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 Post subject: Re: R519: Kernel 3.0 with samsung-laptop module, & samsung-t
PostPosted: 12/10/2011, 17:05 
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Joined: 12/02/2009, 18:08
Posts: 1377
Location: Italy
I've just finished to rewrite Samsung Tools, and now it works with 'samsung-laptop' ('easy-slow-down-manager' support has been dropped). At the moment the code is available on the bazaar repository (https://launchpad.net/samsung-tools) and probably I will release it as version 2.0. :)

It seems to work pretty good, but I had to patch the 'samsung-laptop' kernel module to fix the backlight problems. I've also applied other patches that add support to other Samsung models.

I don't know if those patches will make their way in the official kernel in short times, anyway for Ubuntu users I've applied them in the kernel available on the PPA repository.

_________________
Please consider a little donation to keep the 'Linux On My Samsung' project up and running. Thank you!


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