Samsung Q330 Hotkeys

Emerge app-laptop/samsung-tools (more precise app-laptop/easy-slow-down-manager) for the samsung-backlight module, or try the SAMSUNG_LAPTOP option in the staging drivers area.

Put

{
    /* Samsung Q330 */
    .matches = {
        DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
        DMI_MATCH(DMI_PRODUCT_NAME, "Q330"),
    },
    .callback = atkbd_setup_forced_release,
    .driver_data = atkbd_samsung_forced_release_keys,
}

in the /usr/src/linux/drivers/input/keyboard/atkbd.c file around line 1675. Recompile and reboot.

Use

setkeycodes e008 225
setkeycodes e009 224

to make this keys known.

Running an o2 Prepaid SurfStick under Gentoo Linux

Here is a quick guide on how to get the o2 Prepaid Surfstick running under Gentoo Linux (or other distros).

To get the modem running, you need a few kernel settings:

Device Drivers  --->
	[*] Network device support  --->
		<*>   PPP (point-to-point protocol) support
		[*]     PPP filtering
		<*>     PPP support for async serial ports
		<*>     PPP support for sync tty ports
		<*>     PPP Deflate compression 
		<*>     PPP BSD-Compress compression
	[*] USB support  --->
		<*>   USB Serial Converter support  --->
			[*]   USB Serial Console device support 
			<*>   USB driver for GSM and CDMA modems

When plugging in, the stick shows up in dmesg with its USB memory or MicroSD card memory:

[ 1967.469023] usb 1-1.5: udev 8, busnum 1, minor = 7
[ 1967.469028] usb 1-1.5: New USB device found, idVendor=19d2, idProduct=0117
[ 1967.469032] usb 1-1.5: New USB device strings: Mfr=3, Product=2, SerialNumber=4
[ 1967.469036] usb 1-1.5: Product: ZTE WCDMA Technologies MSM
[ 1967.469039] usb 1-1.5: Manufacturer: ZTE,Incorporated
....
[ 1968.474145] scsi 13:0:0:0: Direct-Access     ZTE      MMC Storage      2.31 PQ: 0 ANSI: 2
[ 1968.474467] sd 13:0:0:0: Attached scsi generic sg4 type 0
[ 1968.477376] sd 13:0:0:0: [sde] 121088 512-byte logical blocks: (61.9 MB/59.1 MiB)
[ 1968.478128] sd 13:0:0:0: [sde] Write Protect is off
[ 1968.478134] sd 13:0:0:0: [sde] Mode Sense: 0f 0e 00 00
[ 1968.478138] sd 13:0:0:0: [sde] Assuming drive cache: write through
[ 1968.480956] sd 13:0:0:0: [sde] Assuming drive cache: write through
[ 1968.480963]  sde: sde1
[ 1968.486096] sd 13:0:0:0: [sde] Assuming drive cache: write through
[ 1968.486102] sd 13:0:0:0: [sde] Attached SCSI removable disk

To "see" the modem, you have to issue an usb_modeswitch (sys-apps/usb_modeswitch) command:

usb_modeswitch -R -W -v <VendorID> -p <ProductID>

You can find the vendor and product id in the dmesg output. After executing the usb_modeswitch command, udev creates some the modem devices (/dev/ttyUSB*). The device names may differ if you have other serial hardware in use.

I use net-dialup/wvdial to create a session to my provider o2 (which in turn uses net-dialup/ppp to create a ppp tunnel). After emerging wvdial use wvdialconf to create a stub configuration for wvdial. Now, edit the /etc/wvdial.conf:

[Dialer o2]
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Modem Type = Analog Modem
ISDN = 0
Username = surf02
Init1 = ATZ
Password = surf02
Modem = /dev/ttyUSB0
Baud = 460800
Carrier Check = No
Stupid Mode = 1
Phone = *99#

[Dialer pin]
Modem = /dev/ttyUSB0
Init3 = AT+CPIN=1234

Don't forget to change the pin in the [Dialoer pin] section.

Now, start the connection with wvdial pin followed by wvdial o2.

See http://documentation.dbernhardt.com/surfstick/article.html for a more verbose guide on how to setup the stick on gentoo linux.

Today I fixed my HDD breakdowns

Since half a year I have had a nasty breakdown of my HDDs. I did alot of debugging but didn't find a solution until today. I will describe in short what happened and what I did. I have two Samsung HD403LJ in my box. They aren't the same age some the firmware differs but physically they should be the same. So from time to time randomly one the two quit to work. Following error shows up:

[  719.004117] ata1: EH in SWNCQ mode,QC:qc_active 0x7FFFFFFF sactive 0x7FFFFFFF
[  719.004329] ata1: SWNCQ:qc_active 0x1 defer_bits 0x7FFFFFFE last_issue_tag 0x0
[  719.004331]   dhfis 0x0 dmafis 0x0 sdbfis 0x0
[  719.005861] ata1: ATA_REG 0x40 ERR_REG 0x0
[  719.007651] ata1: tag : dhfis dmafis sdbfis sacitve
[  719.007654] ata1: tag 0x0: 0 0 0 1  
[  719.007667] ata1.00: exception Emask 0x0 SAct 0x7fffffff SErr 0x0 action 0x6 frozen
[  719.007673] ata1.00: cmd 61/48:00:cc:1d:e2/01:00:00:00:00/40 tag 0 ncq 167936 out
[  719.007675]          res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
[  719.007678] ata1.00: status: { DRDY }
[  719.007682] ata1.00: cmd 61/c8:08:4c:1f:e2/01:00:00:00:00/40 tag 1 ncq 233472 out
[  719.007684]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  719.007686] ata1.00: status: { DRDY }
[  719.007690] ata1.00: cmd 61/08:10:4c:21:e2/00:00:00:00:00/40 tag 2 ncq 4096 out
[  719.007691]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  719.007694] ata1.00: status: { DRDY }
[  719.007698] ata1.00: cmd 61/08:18:dc:15:e0/00:00:00:00:00/40 tag 3 ncq 4096 out
[  719.007699]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  719.007702] ata1.00: status: { DRDY }
[  719.007706] ata1.00: cmd 61/c0:20:54:21:e2/01:00:00:00:00/40 tag 4 ncq 229376 out
[  719.007707]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  719.007709] ata1.00: status: { DRDY }

....

[  719.007882] ata1.00: cmd 61/a8:d8:ec:77:dc/03:00:00:00:00/40 tag 27 ncq 479232 out
[  719.007884]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  719.007886] ata1.00: status: { DRDY }
[  719.007890] ata1.00: cmd 61/30:e0:54:55:e2/00:00:00:00:00/40 tag 28 ncq 24576 out
[  719.007891]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  719.007894] ata1.00: status: { DRDY }
[  719.007898] ata1.00: cmd 61/80:e8:ac:7b:dc/00:00:00:00:00/40 tag 29 ncq 65536 out
[  719.007899]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  719.007901] ata1.00: status: { DRDY }
[  719.007905] ata1.00: cmd 61/60:f0:34:7c:dc/00:00:00:00:00/40 tag 30 ncq 49152 out
[  719.007907]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  719.007909] ata1.00: status: { DRDY }
[  719.320779] ata1: soft resetting link
[  719.473300] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[  724.496619] ata1.00: qc timeout (cmd 0x27)
[  724.496820] ata1.00: failed to read native max address (err_mask=0x4)
[  724.496987] ata1.00: HPA support seems broken, skipping HPA handling
[  724.500109] ata1.00: revalidation failed (errno=-5)
[  724.809942] ata1: soft resetting link
[  724.963301] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[  724.977604] ata1.00: configured for UDMA/133
[  724.977663] ata1: EH complete
[  754.976619] ata1: EH in SWNCQ mode,QC:qc_active 0x7FFFFFFF sactive 0x7FFFFFFF
[  754.976640] ata1: SWNCQ:qc_active 0x1 defer_bits 0x7FFFFFFE last_issue_tag 0x0
[  754.976642]   dhfis 0x0 dmafis 0x0 sdbfis 0x0
[  754.976659] ata1: ATA_REG 0x40 ERR_REG 0x0
[  754.976667] ata1: tag : dhfis dmafis sdbfis sacitve
[  754.976677] ata1: tag 0x0: 0 0 0 1  
[  754.976695] ata1.00: exception Emask 0x0 SAct 0x7fffffff SErr 0x0 action 0x6 frozen
[  754.976710] ata1.00: cmd 61/60:00:34:7c:dc/00:00:00:00:00/40 tag 0 ncq 49152 out
[  754.976711]          res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
[  754.976730] ata1.00: status: { DRDY }
[  754.976741] ata1.00: cmd 61/80:08:ac:7b:dc/00:00:00:00:00/40 tag 1 ncq 65536 out
[  754.976742]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  754.976760] ata1.00: status: { DRDY }
[  754.976770] ata1.00: cmd 61/30:10:54:55:e2/00:00:00:00:00/40 tag 2 ncq 24576 out
[  754.976772]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  754.976790] ata1.00: status: { DRDY }
[  754.976801] ata1.00: cmd 61/a8:18:ec:77:dc/03:00:00:00:00/40 tag 3 ncq 479232 out
[  754.976802]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  754.976820] ata1.00: status: { DRDY }
[  754.976831] ata1.00: cmd 61/e8:20:2c:75:dc/01:00:00:00:00/40 tag 4 ncq 249856 out
[  754.976832]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)

And so on. I googled alot but didn't find any solution. The problem was that I had no way to force this error so that I could go for real bug finding. Interestingly two days ago I did a

dd if=/dev/sda of=/dev/null
dd if=/dev/sdb of=/dev/null

in two windows of a screen session and after around 20 seconds the disks crashed. From there I started to reproduce it with different live cds with different kernels but with no success. Only my latest working kernel (gentoo-sources-2.6.27-gentoo-r8) did it. So I started over took the livecd kernel from the latest minimal cd from gentoo and started round by round modifying the kernel towards what I had running. Long story short (I did built 11 different kernels, reboot, dded, reboot, built kernel, reboot...) it was the in kernel irq-balancing in combination with my nforce chips. Disabling the irq-balancing dropped the throughput by 10% but my disks are running stable again! (Beside the fact that the internal speed difference of the disk are 25%. So if anyone can give me new firmware for samsung disks, please drop a line) Happy day!!!