Samsung Captivate Glide (samsung-i927)

From postmarketOS
Jump to: navigation, search
Samsung Captivate Glide
Samsung Captivate Glide with its keyboard extended, running postmarketOS
Samsung Captivate Glide with its keyboard extended, running postmarketOS
Manufacturer Samsung
Name Captivate Glide
Codename samsung-i927
Released 2011
Original software Android 4.0.4
Chipset Nvidia Tegra 2 AP20H
CPU Dual-core 1.0 GHz Cortex-A9
GPU NVIDIA GeForce ULP (Tegra 2)
Display 480x800 AMOLED
Storage 8 GB
Memory 1 GB
Architecture armv7
USB Networking
3D Acceleration
Mobile data



How to enter flash mode

Press and hold Volume Up + Power simultaneously. Then click Volume Up to confirm.

How to enter recovery mode

Press and hold Volume Down + Power simultaneously.


Using SD card for installation is highly recommended because internal eMMC memory has a limited lifetime. Commands below assume SD card installation, however, in theory, it is possible to boot from USB drive connected via OTG cable.

Insert SD card in your PC and run this from Linux terminal:

1 $ cd /tmp
2 $ git clone
3 $ cd pmbootstrap
4 $ ./ init
5 $ ./ install --sdcard /dev/mmcblkN # change path to your SD card
6 $ ./ flasher flash_kernel

Keep in mind that pmbootstrap requires root permissions.

Sound configuration

Device package includes ALSA UCM profiles for WM8994 chip. Every input and output is disabled by default, so in order to hear something you need to do some configuration.

For example, if you want to enable Speaker output, you'll need to run this from terminal:

$ alsaucm -c wm8994aif1 set _verb HiFi set _enadev Speaker

Supported outputs are: Speaker, Headphones and Earpiece.

If you want to disable it, run:

$ alsaucm -c wm8994aif1 set _verb HiFi set _enadev Speaker set _disdev Speaker

(Note that alsaucm program doesn't track currently enabled devices. Well, it actually does, but only in interactive mode)

To enable mic, run:

$ alsaucm -c wm8994aif1 set _verb Voice set _enadev Headset

And you can disable it like the outputs above.

If you don't want to configure all this on every reboot, then run this as root:

# service alsa save

The configuration will be loaded automatically on boot. If you want to load it manually, then use this command:

# service alsa restore

If you want to adjust the volume or do some additional configuration (set up an internal equalizer, for example), use alsamixer program.


Status Hardware Info
Y Power There's 4 power chips: max8907c, max8922, max17043 and max8893 controlling camera power - on downstream kernel, it's driver called "m5mo_power". max17043 is supported by max17040 driver - the only difference is ALRT interrupt, which is sent on low battery.
Y Display panel Samsung S6E63M0. Supported by driver from PabloPL, which makes it's way to mainline. Panel supports flipping (horizontal/vertical/180 rotation) and changing polarity of H/VSYNC via internal GTCON register. Exact register mapping is not documented and datasheet is not available. Also, timings are changed to make it work with correct colors and without shift on Tegra
Y Touchscreen Atmel mXT224(e). Works fine without maxtouch.cfg.
Y QWERTY keyboard STMPE1801. Mainline kernel supports the chip, but not the keyboard controller, so we use a patched version. Built-in LED is supported via GPIO. Keymap is missing.
P USB Gadget and OTG modes are supported. HSIC mode is missing, which makes our modem not working. Not sure if we can make it work in non-HSIC mode. fsa9480 is used for cable type detection - it's supported by mainline kernel, but no Device Tree bindings available. Currently the fsa9480 driver from PabloPL repo is used.
Y SDHCI Works, but card detection is weird. There's a separate GPIO for card detection, but in downstream kernel it also checks for GPIO on STMPE controller. For now, broken-cd property is used in Device Tree, making detection work in polling mode. WiFi chip and internal memory also run on SDHCI bus.
P WiFi Broadcom BCM4330. Something is happening with firmware: a long list of warnings is displayed on boot. The reason seems to be channel bandwidth - the code internally iterates over (supported) channels and checks for a bandwidth, and if it's not 40MHz, it outputs a warning. Custom firmware is used for this chip because official one doesn't work properly on 5GHz bandwidth with mainline drivers.
Y GPIO keys There is 4 keys on GPIO: Power, Volume up, Volume down and keyboard HALL sensor.
P Touchkey MCS5080. Mainline driver available, but it's bugged, has no DT bindings and not full. A slightly patched version is used with key reading fixed and internal LED support. Doesn't work right now because the driver gets probed before the regulator driver, so chip receives no power and initialization fails.
Y Vibra ISA1200. Driver from p4wifi kernel is used, but there's also another driver from CAF(?).
Y Bluetooth Broadcom BCM4330. Works fine without firwmare.
Y Sound Wolfson WM8994. Uses custom board-level driver. It's fully-routed with DAPM paths configured so we get no suspend-resume issues.
P MHL SII9234. No extcon support in mainline driver. Not tested, but driver seems to be working. Disabled in Xorg config to avoid resolution issues. If you want to test it, you need to enable and configure it in /etc/X11/xorg.conf.d/40-samsung-i927.conf
N Proximity sensor CM3663. No driver in mainline kernel available.
N Back camera Fujitsu M5MO. It is supported by mainline, but has no DT bindings. May have it's own PMIC
N Front camera Samsung S5K6AAFX. It is supported by mainline, but has no DT bindings. Power controlled by m5mo_pmic in downstream.
N Modem XMM6260. Operates on USB with HSIC mode, but also has GPIOs.
P GPS SIRFstarIV GSD4t. gpsd driver can communicate with the chip, but mainline driver doesn't. gpsd is not tested fully because I don't know any software that can work with it :)
P Other sensors These are just not tested, but driver available and probing works: NCT1008 (temperature), MPU3050 (gyro), KXTF9 (accel), AK8975 (compass).


16 17 18 19 20 21 22 23 24 25 14
30 31 32 33 34 35 36 37 38 103 96
102 42 44 45 46 47 48 49 50 105 28 106
100 125 126 51 57 52 108
Side buttons
Button Keycode
Volume Down 114
Volume Up 115
Power 116

See also