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vpoinot
Apprentice
Joined: 10 Nov 2003
Posts: 155
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 Posted: Tue Dec 19, 2006 10:58 pm Post subject: fbsplash stretching properly-sized image... [SOLVED] |
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I followed instructions given on the wiki to set up gensplash, and it almost works: no matter what I do, the background image is horizontally stretched.
Details: my screen is 1680x1050, but listing available modes for frame buffer only gives:
| Code: | # cat /proc/fb0/modes
640x400-8
640x480-8
800x600-8
1024x768-8
[snip]
1280x1024-16
1280x1024-32
[snip]
1400x1050-8
1400x1050-16 |
So I would like to use 1400x1050-16 mode: I created an initrd with the "gentoo" theme (which contains a configuration for 1400x1050), and added the following lines to grub.conf:
| Code: | kernel (hd0,5)/boot/kernel-2.6.18-gentoo-r3 root=/dev/sda8 video=vesafb:ywrap,mtrr:3,1400x1050-16@60 splash=verbose,theme:gentoo console=tty1
initrd (hd0,5)/boot/initrd-1400x1050 |
Now when I boot, the image is displayed, albeit horizontally stretched. I first thought that my kernel was booting in 1680x1050 and trying to fit a 1400x1050 picture on the screen, hence stretching it, but I created an initrd for 1680x1050 and the result is the same. I guess this is because the driver is really unable to handle this resolution, and falls back to 1400x1050 with the previously observed stretch...
I also imagined that maybe the image included in the "gentoo" theme used 32 bpp instead of the 16 bpp allowed by my available modes: in this case, fbsplash would actually try to load the 1400x1050 background image, realize it is 32 bpp, reject it and fall back to the closest available mode, i.e. 1280x1024-32 (as listed above). I don't know if this makes sense, but here is what I did to check this theory:
- I created a dummy theme in /etc/splash/dummy, containing a single 1400x1050 image
| Code: | # ls -lR /etc/splash/dummy
/etc/splash/dummy:
total 8
-rw-r--r-- 1 root root 1268 déc 19 22:59 1400x1050.cfg
drwxr-xr-x 2 root root 4096 déc 19 22:56 images
/etc/splash/dummy/images:
total 56
-rw-r--r-- 1 root root 35223 déc 19 22:53 silent-1400x1050.jpg
-rw-r--r-- 1 root root 18175 déc 19 22:53 verbose-1400x1050.jpg |
- I ran splash_manager:
| Code: | | splash_manager -c demo --mode=v --tty=2 --theme=dummy |
I assume that if my theory were right, fbsplash could not fall back to anything (no other image provided) and simply fail, but it does display the image, stretched as usual...
I am bit confused now. Any explanation about this mystery?
Details:
- using gentoo-sources 2.6.18
- Dell laptop / NV41 [Quadro FX Go1400]
- using vesafb-tng (since it seems it is not possible to use nvidiafb and nvidia X drivers, I haven't tried nvidiafb)
Thanks.
Last edited by vpoinot on Wed Jan 17, 2007 8:48 pm; edited 1 time in total |
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Dan
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Joined: 25 Oct 2005
Posts: 1302
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| Posted: Wed Dec 20, 2006 10:06 pm Post subject: |
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Do you have the vesafb-tng size in the kernel configuration set to match that in the grub.conf ?
CONFIG_FB_VESA_DEFAULT_MODE="1400x1050@60" |
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vpoinot
Apprentice
Joined: 10 Nov 2003
Posts: 155
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| Posted: Thu Dec 21, 2006 12:52 pm Post subject: |
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Yes, but anyway, as far as I know, the command line parameters passed to the kernel have precedence over those in the kernel config. They are correctly set, though, just in case...
I should mention that fbset does return 1400x1050, which is really weird because it means the resolution is the one I want, but if I display an image with the correct size, it is stretched anyway... |
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vpoinot
Apprentice
Joined: 10 Nov 2003
Posts: 155
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| Posted: Sat Dec 23, 2006 11:07 pm Post subject: |
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Just in case somebody makes the same error as I did, here is the solution to this mystery: the vesafb-tng driver can only use 1400x1050 resolution with my card, but my screen has a physical resolution of 1680x1050.
So what happens is that the driver has to "map" a 1400x1050 picture onto a 1680x1050 screen, hence the stretching. At least, this is conclusion I came to...
Therefore, to fix my problem, I simply created a splash theme based on a 1680x1050 picture that I squeezed to 1400x1050 so that when vesafb-tng stretches it, it appears normal  |
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