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framebuffer not working in new installation

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Adel Ahmed
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Joined: 21 Sep 2012
Posts: 1604

Posted: Sun Feb 02, 2025 8:55 am Post subject: framebuffer not working in new installation

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I'm installing gentoo on a cherrytrail tablet, I cannot however seem to be able to get the framebuffer working so I can debug kernel panic issues, if I use the livecd kernel and initrd framebuffer works fine and so does the root file system mounting, so it looks like a kernel config issue.
dmesg from the livecd:

Code:

[ 0.753010] efifb: probing for efifb
[ 0.753133] efifb: framebuffer at 0xc0000000, using 1876k, total 1875k
[ 0.753177] efifb: mode is 800x600x32, linelength=3200, pages=1
[ 0.753208] efifb: scrolling: redraw
[ 0.753225] efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0
[ 0.754045] Console: switching to colour frame buffer device 100x37
[ 0.758452] fb0: EFI VGA frame buffer device

complete dmesg:
https://p.defau.lt/?YXjI1qi2vOW_OVtSzWWAtgkernel config:
https://p.defau.lt/?3c8HvPxgoKFvduYdGdu3QQ

what option have i fogotten here?

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pietinger
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Joined: 17 Oct 2006
Posts: 5365
Location: Bavaria

Posted: Sun Feb 02, 2025 11:20 am Post subject: Re: framebuffer not working in new installation

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Adel Ahmed wrote:

what option have i fogotten here?

Your kernel .config looks like to be a 6.12.x config because there are still settings which are removed in 6.13:

Code:

CONFIG_FB_SYSMEM_HELPERS=y
CONFIG_FB_SYSMEM_HELPERS_DEFERRED=y

... and you dont have the new ones:

Code:

CONFIG_DRM_CLIENT=y
CONFIG_DRM_CLIENT_LIB=y
CONFIG_DRM_CLIENT_SETUP=y
CONFIG_DRM_FBDEV_EMULATION=y

Have you made a "make oldconfig" ? It looks like you have only copied your old kernel into 6.13 and used it for the "make" without doing a "make oldconfig" before.
( https://wiki.gentoo.org/wiki/User:Pietinger/Tutorials/Manual_kernel_configuration#What_is_.22make_oldconfig.22_.3F )

BTW: There are many settings which you miss or are wrong, e.g.:

Code:

# CONFIG_X86_INTEL_LPSS is not set

# CONFIG_MFD_INTEL_LPSS_ACPI is not set
# CONFIG_MFD_INTEL_LPSS_PCI is not set

# CONFIG_IRQ_REMAP is not set

CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y

...

Maybe read this for 6.13: https://wiki.gentoo.org/wiki/User:Pietinger/Experimental/Manual_Configuring_Current_Kernel

... and if you want to start a new config choose this way:
https://wiki.gentoo.org/wiki/User:Pietinger/Tutorials/Manual_kernel_configuration#Before_you_start
https://wiki.gentoo.org/wiki/User:Pietinger/Tutorials/Manual_kernel_configuration#Starting_with_a_clean_environment

(TBH I recommend to read the whole article: https://wiki.gentoo.org/wiki/User:Pietinger/Tutorials/Manual_kernel_configuration )
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