Help with KMS Framebuffer on Intel N2600 (GMA3600)

[samuele-forconi]

Hi,
I'm trying to get Linux + KMS Framebuffer up and running on a board that has this hardware configuration:

• CPU: Intel Atom N2600
• Chipset: Intel NM10
• Integrated graphics system: Intel GMA 3600
• LCD Panel with LVDS controller (LCD resolution is 800x480, 18 bpp, 60Hz)

I have downloaded the latest 3.6.6 linux kernel and configured for my board.

The configuration for the framebuffer section is like this:

#
# Graphics support
#
# CONFIG_AGP is not set
CONFIG_VGA_ARB=y
CONFIG_VGA_ARB_MAX_GPUS=16
# CONFIG_VGA_SWITCHEROO is not set
CONFIG_DRM=y
CONFIG_DRM_KMS_HELPER=y
# CONFIG_DRM_LOAD_EDID_FIRMWARE is not set
CONFIG_DRM_TTM=y
# CONFIG_DRM_TDFX is not set
# CONFIG_DRM_R128 is not set
# CONFIG_DRM_RADEON is not set
# CONFIG_DRM_NOUVEAU is not set

#
# I2C encoder or helper chips
#
# CONFIG_DRM_I2C_CH7006 is not set
# CONFIG_DRM_I2C_SIL164 is not set
# CONFIG_DRM_MGA is not set
# CONFIG_DRM_VIA is not set
# CONFIG_DRM_SAVAGE is not set
# CONFIG_DRM_VMWGFX is not set
CONFIG_DRM_GMA500=y
# CONFIG_DRM_GMA600 is not set
CONFIG_DRM_GMA3600=y
# CONFIG_DRM_UDL is not set
# CONFIG_DRM_AST is not set
# CONFIG_DRM_MGAG200 is not set
# CONFIG_DRM_CIRRUS_QEMU is not set
# CONFIG_STUB_POULSBO is not set
# CONFIG_VGASTATE is not set
CONFIG_VIDEO_OUTPUT_CONTROL=y
CONFIG_FB=y
# CONFIG_FIRMWARE_EDID is not set
# CONFIG_FB_DDC is not set
# CONFIG_FB_BOOT_VESA_SUPPORT is not set
CONFIG_FB_CFB_FILLRECT=y
CONFIG_FB_CFB_COPYAREA=y
CONFIG_FB_CFB_IMAGEBLIT=y
# CONFIG_FB_CFB_REV_PIXELS_IN_BYTE is not set
# CONFIG_FB_SYS_FILLRECT is not set
# CONFIG_FB_SYS_COPYAREA is not set
# CONFIG_FB_SYS_IMAGEBLIT is not set
# CONFIG_FB_FOREIGN_ENDIAN is not set
# CONFIG_FB_BOTH_ENDIAN is not set
# CONFIG_FB_BIG_ENDIAN is not set
# CONFIG_FB_LITTLE_ENDIAN is not set
# CONFIG_FB_SYS_FOPS is not set
# CONFIG_FB_WMT_GE_ROPS is not set
# CONFIG_FB_SVGALIB is not set
# CONFIG_FB_MACMODES is not set
# CONFIG_FB_BACKLIGHT is not set
# CONFIG_FB_MODE_HELPERS is not set
# CONFIG_FB_TILEBLITTING is not set

#
# Frame buffer hardware drivers
#
# CONFIG_FB_CIRRUS is not set
# CONFIG_FB_PM2 is not set
# CONFIG_FB_CYBER2000 is not set
# CONFIG_FB_ARC is not set
# CONFIG_FB_ASILIANT is not set
# CONFIG_FB_IMSTT is not set
# CONFIG_FB_VGA16 is not set
# CONFIG_FB_UVESA is not set
# CONFIG_FB_VESA is not set
# CONFIG_FB_EFI is not set
# CONFIG_FB_N411 is not set
# CONFIG_FB_HGA is not set
# CONFIG_FB_S1D13XXX is not set
# CONFIG_FB_NVIDIA is not set
# CONFIG_FB_RIVA is not set
# CONFIG_FB_I740 is not set
# CONFIG_FB_LE80578 is not set
# CONFIG_FB_MATROX is not set
# CONFIG_FB_RADEON is not set
# CONFIG_FB_ATY128 is not set
# CONFIG_FB_ATY is not set
# CONFIG_FB_S3 is not set
# CONFIG_FB_SAVAGE is not set
# CONFIG_FB_SIS is not set
# CONFIG_FB_VIA is not set
# CONFIG_FB_NEOMAGIC is not set
# CONFIG_FB_KYRO is not set
# CONFIG_FB_3DFX is not set
# CONFIG_FB_VOODOO1 is not set
# CONFIG_FB_VT8623 is not set
# CONFIG_FB_TRIDENT is not set
# CONFIG_FB_ARK is not set
# CONFIG_FB_PM3 is not set
# CONFIG_FB_CARMINE is not set
# CONFIG_FB_GEODE is not set
# CONFIG_FB_TMIO is not set
# CONFIG_FB_SMSCUFX is not set
# CONFIG_FB_UDL is not set
# CONFIG_FB_VIRTUAL is not set
# CONFIG_FB_METRONOME is not set
# CONFIG_FB_MB862XX is not set
# CONFIG_FB_BROADSHEET is not set
# CONFIG_FB_AUO_K190X is not set
# CONFIG_EXYNOS_VIDEO is not set
CONFIG_BACKLIGHT_LCD_SUPPORT=y
# CONFIG_LCD_CLASS_DEVICE is not set
CONFIG_BACKLIGHT_CLASS_DEVICE=y
CONFIG_BACKLIGHT_GENERIC=y
# CONFIG_BACKLIGHT_PROGEAR is not set
# CONFIG_BACKLIGHT_APPLE is not set
# CONFIG_BACKLIGHT_SAHARA is not set
# CONFIG_BACKLIGHT_ADP8860 is not set
# CONFIG_BACKLIGHT_ADP8870 is not set
# CONFIG_BACKLIGHT_LP855X is not set

#
# Console display driver support
#
CONFIG_VGA_CONSOLE=y
CONFIG_VGACON_SOFT_SCROLLBACK=y
CONFIG_VGACON_SOFT_SCROLLBACK_SIZE=64
CONFIG_DUMMY_CONSOLE=y
CONFIG_FRAMEBUFFER_CONSOLE=y
CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY=y
# CONFIG_FRAMEBUFFER_CONSOLE_ROTATION is not set
# CONFIG_FONTS is not set
CONFIG_FONT_8x8=y
CONFIG_FONT_8x16=y
CONFIG_LOGO=y
# CONFIG_LOGO_LINUX_MONO is not set
# CONFIG_LOGO_LINUX_VGA16 is not set
CONFIG_LOGO_LINUX_CLUT224=y

To boot my new kernel I use these parameters:

video=LVDS-1:800x480-18<at>60D drm.debug=0x06

(I wrote <at> because the forum insertion form gives me an error if I use the <at> symbol)

The kernel boots correctly but the LCD screen is completely black (with backlight off).
Using SSH I can login to my system and have a look at dmesg:

[    4.951945] [drm] Initialized drm 1.1.0 20060810
[    5.369917] gma500 0000:00:02.0: setting latency timer to 64
[    5.370123] [drmsb_intel_opregion_setup], Public ACPI methods supported
[    5.370128] [drmsb_intel_opregion_setup], ASLE supported
[    5.370177] gma500 0000:00:02.0: irq 45 for MSI/MSI-X
[    5.370200] [drmsb_intel_init_bios], Using VBT from OpRegion: $VBT CEDARVIEW      d
[    5.370210] [drmrm_mode_debug_printmodeline], Modeline 0:"1024x768" 0 65000 1024 1048 1184 1344 768 771 777 806 0x8 0xa
[    5.370221] [drmarse_sdvo_device_mapping], No SDVO device info is found in VBT
[    5.370301] gma500 0000:00:02.0: GPU: power management timed out.
[    5.377826] acpi device:26: registered as cooling_device5
[    5.378195] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
[    5.378363] input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:00/input/input3
[    5.378576] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
[    5.378583] [drm] No driver support for vblank timestamp query.
[    5.384094] [drmrm_do_probe_ddc_edid], drm: skipping non-existent adapter intel drm LVDSDDC_C
[    5.425206] [drm:cdv_intel_single_pipe_active], pipe enabled 0
[    5.445193] gma500 0000:00:02.0: trying to get vblank count for disabled pipe 1
[    5.445270] gma500 0000:00:02.0: trying to get vblank count for disabled pipe 1
[    5.485585] [drm:cdv_intel_single_pipe_active], pipe enabled 0
[    5.505572] [drm] forcing LVDS-1 connector ON
[    5.505577] [drmrm_fb_helper_parse_command_line], cmdline mode for connector LVDS-1 800x480<at>60Hz
[    5.505587] [drmrm_helper_probe_single_connector_modes], [CONNECTOR:7:VGA-1]
[    5.529444] [drmrm_helper_probe_single_connector_modes], [CONNECTOR:7:VGA-1] disconnected
[    5.529452] [drmrm_helper_probe_single_connector_modes], [CONNECTOR:9:LVDS-1]
[    5.533924] [drmrm_do_probe_ddc_edid], drm: skipping non-existent adapter intel drm LVDSBLC_B
[    5.533935] [drmrm_helper_probe_single_connector_modes], [CONNECTOR:9:LVDS-1] probed modes :
[    5.533940] [drmrm_mode_debug_printmodeline], Modeline 16:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x8 0xa
[    5.533950] [drmrm_helper_probe_single_connector_modes], [CONNECTOR:12VI-D-1]
[    5.538423] [drmrm_do_probe_ddc_edid], drm: skipping non-existent adapter intel drm HDMIB
[    5.538432] [drmrm_helper_probe_single_connector_modes], [CONNECTOR:12VI-D-1] disconnected
[    5.538439] [drmrm_helper_probe_single_connector_modes], [CONNECTOR:14VI-D-2]
[    5.542905] [drmrm_do_probe_ddc_edid], drm: skipping non-existent adapter intel drm HDMIC
[    5.542911] [drmrm_helper_probe_single_connector_modes], [CONNECTOR:14VI-D-2] disconnected
[    5.542916] [drmrm_setup_crtcs],
[    5.542921] [drmrm_enable_connectors], connector 7 enabled? no
[    5.542926] [drmrm_enable_connectors], connector 9 enabled? yes
[    5.542930] [drmrm_enable_connectors], connector 12 enabled? no
[    5.542935] [drmrm_enable_connectors], connector 14 enabled? no
[    5.542940] [drmrm_target_preferred], looking for cmdline mode on connector 9
[    5.542948] [drmrm_target_preferred], found mode 800x480
[    5.542952] [drmrm_setup_crtcs], picking CRTCs for 2048x2048 config
[    5.542959] [drmrm_setup_crtcs], desired mode 800x480 set on crtc 4
[    5.544998] fbcon: psbfb (fb0) is primary device
[    5.545782] [drmrm_crtc_helper_set_config],
[    5.545785] [drmrm_crtc_helper_set_config], [CRTC:3] [NOFB]
[    5.545795] [drmrm_crtc_helper_set_config],
[    5.545799] [drmrm_crtc_helper_set_config], [CRTC:4] [FB:19] #connectors=1 (x y) (0 0)
[    5.545812] [drmrm_crtc_helper_set_config], crtc has no fb, full mode set
[    5.545815] [drmrm_crtc_helper_set_config], modes are different, full mode set
[    5.545821] [drmrm_mode_debug_printmodeline], Modeline 0:"" 0 0 0 0 0 0 0 0 0 0 0x0 0x0
[    5.545828] [drmrm_mode_debug_printmodeline], Modeline 18:"800x480" 0 29605 800 816 896 992 480 481 484 497 0x0 0x6
[    5.545830] [drmrm_crtc_helper_set_config], encoder changed, full mode switch
[    5.545833] [drmrm_crtc_helper_set_config], crtc changed, full mode switch
[    5.545837] [drmrm_crtc_helper_set_config], [CONNECTOR:9:LVDS-1] to [CRTC:4]
[    5.545840] [drmrm_crtc_helper_set_config], attempting to set mode from userspace
[    5.545846] [drmrm_mode_debug_printmodeline], Modeline 18:"800x480" 0 29605 800 816 896 992 480 481 484 497 0x0 0x6
[    5.545852] [drmrm_crtc_helper_set_mode], [CRTC:4]
[    5.545861] [drm:cdv_intel_crtc_mode_set], Use SSC reference clock 100 Mhz
[    5.545868] [drmrm_mode_debug_printmodeline], Modeline 20:"800x480" 0 65000 1024 1048 1184 1344 768 771 777 806 0x0 0x6
[    5.547424] [drm:cdv_sb_write], 0x00008038: 0x04000001 (before)
[    5.547427] [drm:cdv_sb_write], 0x00008038: 0x0068a701
[    5.551414] [drm:cdv_sb_write], 0x00008038: 0x0068a701 (after)
[    5.553409] [drm:cdv_dpll_set_clock_cdv], use their DPLL for pipe A/B
[    5.555407] [drm:cdv_sb_write], 0x00008030: 0x7e40221c (before)
[    5.555410] [drm:cdv_sb_write], 0x00008030: 0x7e40221c
[    5.559403] [drm:cdv_sb_write], 0x00008030: 0x7e40221c (after)
[    5.563392] [drm:cdv_sb_write], 0x00008028: 0x1700217f (before)
[    5.563395] [drm:cdv_sb_write], 0x00008028: 0x5900217f
[    5.567385] [drm:cdv_sb_write], 0x00008028: 0x5900217f (after)
[    5.571379] [drm:cdv_sb_write], 0x00008034: 0x80980057 (before)
[    5.571382] [drm:cdv_sb_write], 0x00008034: 0x16000157
[    5.575373] [drm:cdv_sb_write], 0x00008034: 0x16000157 (after)
[    5.579367] [drm:cdv_sb_write], 0x0000803c: 0x01550000 (before)
[    5.579370] [drm:cdv_sb_write], 0x0000803c: 0x81552000
[    5.583361] [drm:cdv_sb_write], 0x0000803c: 0x81552000 (after)
[    5.587354] [drm:cdv_sb_write], 0x00000120: 0x000000c4 (before)
[    5.587357] [drm:cdv_sb_write], 0x00000120: 0x003000c4
[    5.591349] [drm:cdv_sb_write], 0x00000120: 0x003000c4 (after)
[    5.595342] [drm:cdv_sb_write], 0x00000220: 0x000000c4 (before)
[    5.595345] [drm:cdv_sb_write], 0x00000220: 0x003000c4
[    5.599335] [drm:cdv_sb_write], 0x00000220: 0x003000c4 (after)
[    5.603329] [drm:cdv_sb_write], 0x00002320: 0x003000c4 (before)
[    5.603332] [drm:cdv_sb_write], 0x00002320: 0x003000c4
[    5.607327] [drm:cdv_sb_write], 0x00002320: 0x003000c4 (after)
[    5.611321] [drm:cdv_sb_write], 0x00002420: 0x003000c4 (before)
[    5.611324] [drm:cdv_sb_write], 0x00002420: 0x003000c4
[    5.615313] [drm:cdv_sb_write], 0x00002420: 0x003000c4 (after)
[    5.615467] [drm:cdv_intel_crtc_mode_set], Mode for pipe B:
[    5.615474] [drmrm_mode_debug_printmodeline], Modeline 18:"800x480" 0 29605 800 816 896 992 480 481 484 497 0x0 0x6
[    5.655581] [drmrm_crtc_helper_set_mode], [ENCODER:10:LVDS-10] set [MODE:18:800x480]
[    5.655736] [drm:cdv_intel_single_pipe_active], pipe enabled 2
[    5.695762] [drmrm_crtc_helper_set_config], Setting connector DPMS state to on
[    5.695766] [drmrm_crtc_helper_set_config],        [CONNECTOR:9:LVDS-1] set DPMS on
[    5.745031] Console: switching to colour frame buffer device 100x30
[    5.749488] fb0: psbfb frame buffer device
[    5.749492] drm: registered panic notifier
[    5.749614] [drm:cdv_get_max_backlight], LVDS Panel PWM value is 0!
[    5.749622] [drm:cdv_get_max_backlight], LVDS Panel PWM value is 0!
[    5.749633] [drm] Initialized gma500 1.0.0 2011-06-06 for 0000:00:02.0 on minor 0

I can't understand if I have done some mistakes in the kernel configuration (enabled some conflicting features) or if there is still some other settings to configure to make Linux KMS + Framebuffer run correctly.



Thank you for any help/suggestions.

Best regards,
Samuele Forconi.

[carloa]

Ciao Samuele,

we just had the same headache with D2500HN Intel board; in our case, framebuffer implementation provided by gma500_gfx in kernel 3.6.6 could only provide 1024x768@0Hz virtual screen, and we needed 800x600. The workaround we found was to blacklist gma500_gfx.ko, uninstall xsever-xorg-video-fbdev, install xserver-xorg-video-vesa (old good vesa ), and - of course - plan not to buy other mainboard from Intel, for the future.

HTH,
Carlo

[samuele-forconi]

Ciao Carlo,

my problem is that 840x480 is not a standard VESA resolution, so I can't use the VESA driver to get the framebuffer work at that screen resolution.
Ubuntu claims to have support for GMA3600, I'll give it a try.


Thanks for your intrest.

Regards,
Samuele.