youwin
n00b
Joined: 22 Sep 2008
Posts: 3
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 Posted: Mon Sep 22, 2008 2:28 am Post subject: [solved] framebuffer (kernel options vga) resolution fail |
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I just installed gentoo, and now i want to get my console to be at a higher resolution but the vga or video options to the kernel statement in grub arent working.
Ive recompiled my kernel a few times (all i do is make menuconfig, edit, save, make, cp to boot, and reboot computer right? so long as no new modules are made) with a few framebuffer options but im just tweaking things in the dark, i dont know what im doing.
heres the line in grub.conf that matters:
| Code: | | kernel /boot/kernel-2.6.25-gentoo-r7 root=/dev/hda3 video=uvesafb:mtrr:3,ywrap,1024x768-32@85 |
ive tried many other options for the video options including
| Code: | | vga=0x318 video=vesafb:mtrr:3,ywrap |
the resolution now looks like 640x480
Ive tried following this site for installation instructions on uvesafb http://dev.gentoo.org/~spock/projects/uvesafb/ but it didnt work (I reconfigured the kernel, emerged klibc and v86d). On that page it said that /sys/class/graphics/fb0/modes had all the available resolutuions for your framebuffer. My file has in it one line: U:640x480p-59, how do i get this to list more resolutions? also there are other directories other than fb0, fb1 and fb2, and the modes file in those directories has a more reasonable line in it. Can I use this fb1 directory?
thanks 
EDIT: someone on IRC gave me the link: http://gentoo-wiki.com/HOWTO_Framebuffer_Support, and while it was very similar to the instructions on the http://dev.gentoo.org/~spock/projects/uvesafb/ site but a little bit more verbose and it worked, I had to make sure some options were correctly configured in my kernel which I swore they were, but i guess the second try worked.
EDIT: my problem is not solved, now it doesnt matter what i put in as a resolution it is always going to what looks like 1280x1024 i want this thing versatile enough to change to some other resolutions 1024x768 at least. Its good where it is but I really want this to work. thanks.
EDIT: I suspect the following lines from my dmesg may give a clue as to whats going wrong:
| Code: | uvesafb: monitor limits: vf =160 Hz, hf = 85 kHz, clk = 190 MHz
uvesafb: scrolling: ywrap using protected mode interface, yres_virtual=24576
uvesafb: cannot reserve video memory at 0xe0000000
uvesafb: probe of uvesafb.0 failed with error -5 |
anyone know what error -5 is? or how to fix this? thanks.
EDIT: ok, when i was trying all sorts of things to get my framebuffering to work, i went buck-wild with the options in
| Code: | Device Drivers --->
Graphics Support --->
support for frame buffer devices ---> * |
enabling everything built in except for the experimental stuff. I changed it so that only the following are enabled:
| Code: | [*] enable firmware EDID
-*- enable video mode handling helpers
[*] enable Tile Blitting Support
<*> VGA 16-color graphics support
<*> Userspace VESA VGA graphics support
[*] VESA VGA graphics support |
nothing else and I was now able to set my framebuffer to many different resolutions with
| Code: | video=uvesafb:1280x1024,mtrr:3,ywrap
video=uvesafb:1024x768,mtrr:3,ywrap
video=uvesafb:800x600,mtrr:3,ywrap |
the dmesg no longer has the line
| Code: | | uvesafb: probe of uvesafb.0 failed with error -5 |
and now has
| Code: | Console: switching to colour frame buffer device 128x48
uvesafb: framebuffer at 0xe0000000, mapped to 0xf8d80000, using 24576k, total 131072k
fb0: VESA VGA frame buffer device |
so i guess everything worked out, thanks.
Last edited by youwin on Sun Oct 05, 2008 4:29 am; edited 1 time in total |
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