$ glxinfo |grep -i renderer
OpenGL renderer string: Mesa DRI Mobile Intel® GM45 Express Chipset
$ DRI_PRIME=1 glxinfo |grep -i renderer
OpenGL renderer string: Gallium 0.4 on AMD RV620

$ xrandr –listproviders
Providers: number : 2
Provider 0: id: 0×83 cap: 0xb, Source Output, Sink Output, Sink Offload crtcs: 2 outputs: 3 associated providers: 0 name:Intel
Provider 1: id: 0×54 cap: 0xd, Source Output, Source Offload, Sink Offload crtcs: 2 outputs: 3 associated providers: 0 name:radeon
$ xrandr –setprovideroffloadsink 0×54 0×83
$ xrandr –listproviders
Providers: number : 2
Provider 0: id: 0×83 cap: 0xb, Source Output, Sink Output, Sink Offload crtcs: 2 outputs: 3 associated providers: 1 name:Intel
Provider 1: id: 0×54 cap: 0xd, Source Output, Source Offload, Sink Offload crtcs: 2 outputs: 3 associated providers: 1 name:radeon

Google for more.

T400 uses AN12946A audio amplifier (located right to touchpad, just under bios battery – remove keyboard bezel to get access). See T400 schematic for details.

AN12946A has selectable gain modes using SP GAIN 1 (pin 27) and SP GAIN 2 (pin 28). By default T400 uses +13dB mode (which is lowest possible).

We can easily switch to +19dB mode by lowering SP GAIN 1 (pin 27) logic level (see AN12946A datasheet) and leaving SP GAIN 2 (pin 28) high. SP GAIN 1 (pin 27) uses 10k resitor for pull up. We are lucky – pin 26 is GND, so the solution is – solder AN12946A pins 26 and 27 together.

Result – speakers volume is better (not great though). I had to use 100% volume before, now about 80-85%.

perl -e ‘use POSIX; tcsendbreak(1,0);’ > /dev/ttyS0

Same method used for silkscreen:

And final device, russian Go-ESR meter (for measuring capacitance and ESR of electrolitic capacitors) done according to a modified project.

Case:

Hardware:

• Telit GE683-GPS GSM/GPRS module programmable in Python Language
• 1575R-B G GPS antenna
• STMicroelectronics LIS302DL MEMS motion sensor 3-axis – ± 2g/± 8g smart digital output “piccolo” accelerometer (not sure if I found correct chip; hard to tell from the device itself)
• NXP PCF8574 Remote 8-bit I/O expander for I2C-bus
• Silabs CP2102 USB to UART Bridge
• TI LM2575S-5.0 1-A Simple Step-Down Adjustable Voltage Switching Regulator with Output Enable
• Maxim MAX890L 1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown

d9b68c7785b00f8d1bc2f1a2e0fc85cb002

$ cat bin/magnet2torrent.py

d9b68c7785b00f8d1bc2f1a2e0fc85cb003

mount -o loop,offset=32256 dos-hdd.img dir

I’m using such image to update BIOSes in machines where bios doesn’t fit into floppy image. Such hdd image can be places inside iso image to be booted at virtual or real cdrom.

mkisofs -v -r -T -J –hard-disk-boot -b dos-hdd.img -o ../test.iso .


options snd-hda-intel index=1,0


Enable dmix with surround 5.1 support (no upmixing):


pcm.dmixer {
type dmix
ipc_key 1024
ipc_key_add_uid false # let multiple users share
ipc_perm 0666 # IPC permissions (octal, default 0600)
slave {
pcm "hw:0,0"
channels 6
# buffer_size 16384
}
}

pcm.!default {
type plug
slave.pcm dmixer
slave.channels 6
}


to /etc/asound.conf. Enable 6 channels in alsamixer, too.