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sebaro
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Joined: 03 Jul 2006
Posts: 1141
Location: Romania
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 Posted: Mon Jul 24, 2017 9:26 am Post subject: [Solved] Console without framebuffer in UEFI mode |
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If I disable framebuffer in kernel I have no console.
The only way to have an X session is to autologin and autostart X.
| Code: |
VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Kabini [Radeon HD 8400 / R3 Series] (prog-if 00 [VGA controller])
Subsystem: ASRock Incorporation Kabini [Radeon HD 8400 / R3 Series]
Flags: bus master, fast devsel, latency 0, IRQ 41
Memory at c0000000 (64-bit, prefetchable) [size=256M]
Memory at d0000000 (64-bit, prefetchable) [size=8M]
I/O ports at f000 [size=256]
Memory at ffb00000 (32-bit, non-prefetchable) [size=256K]
Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: radeon
Kernel modules: radeon, amdgpu
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| Code: |
#
# 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_DP_AUX_CHARDEV is not set
# CONFIG_DRM_DEBUG_MM is not set
# CONFIG_DRM_DEBUG_MM_SELFTEST is not set
CONFIG_DRM_KMS_HELPER=m
# CONFIG_DRM_FBDEV_EMULATION is not set
# CONFIG_DRM_LOAD_EDID_FIRMWARE is not set
CONFIG_DRM_TTM=m
#
# I2C encoder or helper chips
#
# CONFIG_DRM_I2C_CH7006 is not set
# CONFIG_DRM_I2C_SIL164 is not set
# CONFIG_DRM_I2C_NXP_TDA998X is not set
CONFIG_DRM_RADEON=m
CONFIG_DRM_RADEON_USERPTR=y
CONFIG_DRM_AMDGPU=m
# CONFIG_DRM_AMDGPU_SI is not set
CONFIG_DRM_AMDGPU_CIK=y
CONFIG_DRM_AMDGPU_USERPTR=y
# CONFIG_DRM_AMDGPU_GART_DEBUGFS is not set
#
# ACP (Audio CoProcessor) Configuration
#
# CONFIG_DRM_AMD_ACP is not set
# CONFIG_DRM_NOUVEAU is not set
# CONFIG_DRM_I915 is not set
# CONFIG_DRM_VGEM is not set
# CONFIG_DRM_VMWGFX is not set
# CONFIG_DRM_GMA500 is not set
# 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_DRM_QXL is not set
# CONFIG_DRM_BOCHS is not set
CONFIG_DRM_BRIDGE=y
#
# Display Interface Bridges
#
# CONFIG_DRM_ANALOGIX_ANX78XX is not set
# CONFIG_DRM_HISI_HIBMC is not set
# CONFIG_DRM_TINYDRM is not set
# CONFIG_DRM_LEGACY is not set
# CONFIG_DRM_LIB_RANDOM is not set
#
# Frame buffer Devices
#
# CONFIG_FB is not set
CONFIG_FB_CMDLINE=y
CONFIG_BACKLIGHT_LCD_SUPPORT=y
CONFIG_LCD_CLASS_DEVICE=m
CONFIG_LCD_PLATFORM=m
CONFIG_BACKLIGHT_CLASS_DEVICE=m
CONFIG_BACKLIGHT_GENERIC=m
# CONFIG_BACKLIGHT_APPLE is not set
# CONFIG_BACKLIGHT_PM8941_WLED is not set
# CONFIG_BACKLIGHT_SAHARA is not set
# CONFIG_BACKLIGHT_ADP8860 is not set
# CONFIG_BACKLIGHT_ADP8870 is not set
# CONFIG_BACKLIGHT_LM3639 is not set
# CONFIG_BACKLIGHT_LV5207LP is not set
# CONFIG_BACKLIGHT_BD6107 is not set
# CONFIG_BACKLIGHT_ARCXCNN is not set
# CONFIG_VGASTATE is not set
CONFIG_HDMI=y
#
# Console display driver support
#
CONFIG_VGA_CONSOLE=y
CONFIG_VGACON_SOFT_SCROLLBACK=y
CONFIG_VGACON_SOFT_SCROLLBACK_SIZE=64
# CONFIG_VGACON_SOFT_SCROLLBACK_PERSISTENT_ENABLE_BY_DEFAULT is not set
CONFIG_DUMMY_CONSOLE=y
CONFIG_DUMMY_CONSOLE_COLUMNS=80
CONFIG_DUMMY_CONSOLE_ROWS=25
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----------
EDIT:
The conclusions are:
1. There is no VGA/text console in UEFI mode only in BIOS or legacy boot.
2. To have working consoles in UEFI mode, these are the kernel options for KMS drivers and EFI framebuffer.
Example is for Radeon as loadable module, it should work as built-in module too.
2.1. DRM as built-in module
| Code: |
Graphics support
----- ATI Radeon (DRM_RADEON) [m]
|____ Direct Rendering Manager (XFree86 4.1.0 and higher DRI support) (DRM) [y]
----- Enable legacy fbdev support for your modesetting driver (DRM_FBDEV_EMULATION) [y]
|____ Frame buffer Devices
----- EFI-based Framebuffer Support (FB_EFI) [y]
|
2.2 DRM as loadable module
| Code: |
Graphics support
----- ATI Radeon (DRM_RADEON) [m]
|____ Direct Rendering Manager (XFree86 4.1.0 and higher DRI support) (DRM) [m]
----- Enable legacy fbdev support for your modesetting driver (DRM_FBDEV_EMULATION) [y]
|____ Frame buffer Devices
----- EFI-based Framebuffer Support (FB_EFI) [y]
|____ Support for frame buffer devices (FB) [y]
|____ Console display driver support
----- Framebuffer Console support (FRAMEBUFFER_CONSOLE) [y]
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Last edited by sebaro on Wed Jul 26, 2017 3:38 pm; edited 4 times in total |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54578
Location: 56N 3W
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| Posted: Mon Jul 24, 2017 9:51 am Post subject: |
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sebaro,
That looks like it should get you the old 80x25 text console.
Put dmesg onto a pastebin site so we can see what actually happens at startup.
It will not fit into a post.
_________________
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NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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sebaro
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Joined: 03 Jul 2006
Posts: 1141
Location: Romania
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| Posted: Mon Jul 24, 2017 10:19 am Post subject: |
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https://pastebin.com/raw/Fv9uAgru
| Code: |
[ 0.000000] Console: colour dummy device 80x25
[ 0.000000] console [tty0] enabled
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But I don't see anything on the display. |
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Maxxx
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Posts: 595
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sebaro
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Joined: 03 Jul 2006
Posts: 1141
Location: Romania
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| Posted: Mon Jul 24, 2017 10:59 am Post subject: |
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That's for graphical/framebuffer, I want the old text/vga console.
| Code: |
VGA text console (VGA_CONSOLE)
CONFIG_VGA_CONSOLE:
Saying Y here will allow you to use Linux in text mode through a
display that complies with the generic VGA standard. Virtually
everyone wants that.
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Maxxx
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Posts: 595
Location: Italia
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| Posted: Mon Jul 24, 2017 11:04 am Post subject: |
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| But since i enabled framefuffer i have text console, with framebuffer disabled i haven't it. |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54578
Location: 56N 3W
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| Posted: Mon Jul 24, 2017 11:07 am Post subject: |
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sebaro,
You could try turning off | Code: | | CONFIG_DUMMY_CONSOLE=y |
What this will do depends on how your graphics card works.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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sebaro
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Joined: 03 Jul 2006
Posts: 1141
Location: Romania
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| Posted: Mon Jul 24, 2017 11:42 am Post subject: |
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| NeddySeagoon wrote: | sebaro,
You could try turning off | Code: | | CONFIG_DUMMY_CONSOLE=y |
What this will do depends on how your graphics card works. |
I can't disable it from "make config", is it safe to disable it in the config file?
| Maxxx wrote: | | But since i enabled framefuffer i have text console, with framebuffer disabled i haven't it. |
Framebuffer is for displaying boot images/splashes.
The boot process is very fast for me so I don't need these, I just need to be able to login. |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54578
Location: 56N 3W
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| Posted: Mon Jul 24, 2017 11:58 am Post subject: |
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sebaro,
You must never edit the .config by hand.
menuconfig and friends know all the dependencies and hidden symbols.
One menuconfig entry may change many options in the .config file.
| Code: | Symbol: DUMMY_CONSOLE [=y] │
│ Type : boolean │
│ Defined at drivers/video/console/Kconfig:94 │
│ Depends on: HAS_IOMEM [=y] && VT [=y] && (!VGA_CONSOLE [=y] || SGI_NEWPORT_CONSOLE [=n]!=y) |
So DUMMY_CONSOLE is a hidden symbol which is set on when the Depends on: evaluates to true.
For AMD/Intel systems, it requires !VGA_CONSOLE ... don't do that.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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sebaro
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Joined: 03 Jul 2006
Posts: 1141
Location: Romania
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| Posted: Mon Jul 24, 2017 12:30 pm Post subject: |
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I see when booting:
| Quote: | error: no suitable video mode found.
Booting in blind mode |
Is there some option to set in grub?
The consoles are working, they respond to keybord but are not visible. |
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NeddySeagoon
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Location: 56N 3W
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| Posted: Mon Jul 24, 2017 2:13 pm Post subject: |
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sebaro,
Put vga=ask on the kernel command line. The boot process will show you a list of vga modes that it knows.
You then enter the number of the mode you want.
From memory, the numbers are 0x100 in error. A long time ago, I used to use vga=0x317
You can edit grubs kernel command line at boot time. When the menu appears, press 'e'.
This only changes the in memory copy.
_________________
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NeddySeagoon
Computer users fall into two groups:-
those that do backups
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josephg
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sebaro
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Joined: 03 Jul 2006
Posts: 1141
Location: Romania
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| Posted: Mon Jul 24, 2017 3:28 pm Post subject: |
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| I've tried different values for vga, all seems to be ignored. |
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NeddySeagoon
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Location: 56N 3W
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| Posted: Mon Jul 24, 2017 3:34 pm Post subject: |
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sebaro,
Did vga=ask give a list?
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
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sebaro
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Joined: 03 Jul 2006
Posts: 1141
Location: Romania
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| Posted: Mon Jul 24, 2017 3:54 pm Post subject: |
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| NeddySeagoon wrote: | sebaro,
Did vga=ask give a list? |
No, it just boots. This is the command line:
| Code: |
[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.12.3-gentoo-b1 root=/dev/sda2 rootfstype=ext4 init=/usr/lib/systemd/systemd ro vga=ask libata.force=noncq
[ 0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.12.3-gentoo-b1 root=/dev/sda2 rootfstype=ext4 init=/usr/lib/systemd/systemd ro vga=ask libata.force=noncq
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NeddySeagoon
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Location: 56N 3W
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| Posted: Mon Jul 24, 2017 5:08 pm Post subject: |
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sebaro,
That command line is correct.
Lets step back a little. You want to have a plain VGA console with no framebuffer because you perceive it will solve a problem.
Maybe there is another solution, share the problem you want to solve.
_________________
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NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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sebaro
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Posts: 1141
Location: Romania
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| Posted: Mon Jul 24, 2017 5:31 pm Post subject: |
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| I want to replace systemd with runit/sysvinit/openrc. I want to be able to see the kernel and init messages and to be able to see the login prompt. I changed the init in kernel command line and I thought it didn't work because there was no output, but was the issue with the console not showing. I don't need the framebuffer console because the boot is fast but I guess I'll have to build another kernel with fb enabled just for testing. |
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mir3x
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Joined: 02 Jun 2012
Posts: 455
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| Posted: Mon Jul 24, 2017 6:50 pm Post subject: |
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try set gfxpayload=text
or set gfxpayload=auto in grub.conf
( if doesnt work u can try disable X86_SYSFB in kernel)
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sebaro
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Location: Romania
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| Posted: Tue Jul 25, 2017 6:29 am Post subject: |
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| mir3x wrote: | try set gfxpayload=text
or set gfxpayload=auto in grub.conf
( if doesnt work u can try disable X86_SYSFB in kernel) |
Tried with both auto and text, here are the grub default and grub menu entry:
| Code: |
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=3
GRUB_CMDLINE_LINUX_DEFAULT=""
GRUB_CMDLINE_LINUX=""
GRUB_GFXPAYLOAD_LINUX=text
GRUB_COLOR_NORMAL="white/black"
GRUB_COLOR_HIGHLIGHT="magenta/black"
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| Code: |
menuentry 'Gentoo GNU/Linux' {
savedefault
insmod gzio
insmod part_gpt
insmod ext2
set root='hd0,gpt2'
echo 'Loading Linux 4.12.3-gentoo-b1 ...'
linux /boot/vmlinuz-4.12.3-gentoo-b1 root=/dev/sda2 rootfstype=ext4 init=/usr/lib/systemd/systemd ro quiet libata.force=noncq
}
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| Code: |
# CONFIG_X86_SYSFB is not set
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s4e8
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| Posted: Tue Jul 25, 2017 9:44 am Post subject: |
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| You use the EFI boot, EFI firmware provided an GOP service and Console TextOutput service, these service can't access after kernel loading, except DIRECT WRITE the framebuffer. In order to use VGA text console, you should boot in legacy mode. |
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sebaro
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Posts: 1141
Location: Romania
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| Posted: Tue Jul 25, 2017 11:05 am Post subject: |
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| s4e8 wrote: | | You use the EFI boot, EFI firmware provided an GOP service and Console TextOutput service, these service can't access after kernel loading, except DIRECT WRITE the framebuffer. In order to use VGA text console, you should boot in legacy mode. |
OK, so I have two choices:
1 BIOS/Legacy booting
2 UEFI booting + frame buffer support
For choice 2, which frame buffer driver to install?
- generic: vesa/uvesa
- efi
- radeon |
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chithanh
Developer
Joined: 05 Aug 2006
Posts: 2158
Location: Berlin, Germany
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| Posted: Tue Jul 25, 2017 2:05 pm Post subject: |
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For framebuffer console, enable CONFIG_FRAMEBUFFER_CONSOLE (if it is a module, make sure that it gets loaded during boot).
For the drivers enabling the framebuffer you have the following options:
- radeon driver + Kabini firmware
| Code: | | CONFIG_DRM_RADEON=y |
amdgpu driver + Kabini firmware
| Code: | CONFIG_DRM_AMDGPU=y
CONFIG_DRM_AMDGPU_CIK=y |
efifb
simplefb
| Code: | CONFIG_FB_SIMPLE=y
CONFIG_X86_SYSFB=y |
If you choose one method, best disable the others. |
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sebaro
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Posts: 1141
Location: Romania
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| Posted: Tue Jul 25, 2017 3:56 pm Post subject: |
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| chithanh wrote: | | For framebuffer console, enable CONFIG_FRAMEBUFFER_CONSOLE (if it is a module, make sure that it gets loaded during boot). |
| Code: |
Frame buffer Devices
-> Support for frame buffer devices (FB)
----> ATI Radeon display support (FB_RADEON)
Console display driver support
-> Framebuffer Console support (FRAMEBUFFER_CONSOLE)
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I assume FB and FRAMEBUFFER_CONSOLE must be built-in, if I build them as modules I'll have to use initramfs. |
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chithanh
Developer
Joined: 05 Aug 2006
Posts: 2158
Location: Berlin, Germany
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| Posted: Tue Jul 25, 2017 7:31 pm Post subject: |
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| Do not enable radeonfb (CONFIG_FB_RADEON), it is the legacy radeon framebuffer which will do nothing at best, and prevent X from working properly at worst. |
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josephg
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Joined: 10 Jan 2016
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| Posted: Wed Jul 26, 2017 3:01 am Post subject: |
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| You can disable the framebuffer in your bootloader configuration by passing "vga=0" to the kernel. |
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Kernel & Hardware
