Re: Framebuffer Driver

Re: Framebuffer Driver

[Antonino A. Daplas]

On Thursday 20 January 2005 20:19, Кирилл Иванов wrote:
> Hello
> My name is Kirill.
> I'am not professional programmer, but wrote framebuffer driver for
> my Cyberblade/i1 (Trident Microsystems) videocard.
> Driver work, but with troubles.
>
> Mode is only one for now -- 640x480-8@85.
> When module (i wrote it as module) loaded, kernel reports:
>
> Console: switching to colour frame buffer device 80x30
>
> Yes, console have 30 lines and 80 columns, but this 80 columns
> is very stretched over hirisontal. And font is very big and greasy
> and stretched too, although i set fb.fontname == "font_vga_8x16".
> So, image of console looks like zoomed.

If you do see 80 chars in the horizontal and 30 lines of text, maybe that
is the normal appearance, especially if you have a very large display?  Also
if your monitor does not have a 4:3 aspect ratio, then the fonts could
appear stretched.

Why not try a higher resolution instead, at least 1024x768?

If you think the problem is different, why not post a link with a screenshot
of the console?

BTW, have you tried using other apps, such as X, fbtest, etc, and still
see the same problem?

Tony




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framebuffer driver

[Sudip Mukherjee]

Hi,
I have started with a pci based vga card. after booting i can see the
card in lspci , and after loading the driver as a module i can see
that the driver is linked with the device using lspci -k.

for initial testing, i am using the ioctl command FBIOPUT_CON2FBMAP ,
which is supposed to map a console to a particular framebuffer. But on
switching to that console I am not getting anything in the monitor. To
test if ioctl is getting executed, i inserted some debugging messages
as pr_err() in that particular case of the ioctl function in
drivers/video/fbdev/core/fbmem.c , but after calling the ioctl again i
am not getting those debug messages in dmesg.
Now i am in doubt about what is happening.. if ioctl is executed then
my debug messages should have been printed.

Can anyone please give me some hints about how to test this new vga
card... and also why the debug messages from ioctl is not getting
printed ..

i think its almost a similar thing as https://lkml.org/lkml/2009/12/2/288


thanks
sudip

framebuffer driver

[Sudip Mukherjee]

an update .. I am getting the debug messages from ioctl ... by mistake
I placed the debugging messages in FBIOGET_CON2FBMAP.
so if ioctl is executing, on pressing alt+ctrl+F2 the console should
display on the second monitor (if i am wrong), but nothing is showing
on that.

sudip


On Fri, Dec 12, 2014 at 1:38 PM, Sudip Mukherjee
<sudipm.mukherjee@gmail.com> wrote:
> Hi,
> I have started with a pci based vga card. after booting i can see the
> card in lspci , and after loading the driver as a module i can see
> that the driver is linked with the device using lspci -k.
>
> for initial testing, i am using the ioctl command FBIOPUT_CON2FBMAP ,
> which is supposed to map a console to a particular framebuffer. But on
> switching to that console I am not getting anything in the monitor. To
> test if ioctl is getting executed, i inserted some debugging messages
> as pr_err() in that particular case of the ioctl function in
> drivers/video/fbdev/core/fbmem.c , but after calling the ioctl again i
> am not getting those debug messages in dmesg.
> Now i am in doubt about what is happening.. if ioctl is executed then
> my debug messages should have been printed.
>
> Can anyone please give me some hints about how to test this new vga
> card... and also why the debug messages from ioctl is not getting
> printed ..
>
> i think its almost a similar thing as https://lkml.org/lkml/2009/12/2/288
>
>
> thanks
> sudip

framebuffer driver

[Sudip Mukherjee]

another update.
For testing I disabled my on-board graphics. so when system is booting
up, it is not having any /dev/fb0 . I am now connecting to it through
ssh and loading the module. after module is inserted the board is
initialized and I got my /dev/fb0, I have also attached the dmesg. But
the monitor is still blank. :(

any hints please ...

thanks
sudip



On Fri, Dec 12, 2014 at 4:13 PM, Sudip Mukherjee
<sudipm.mukherjee@gmail.com> wrote:
> an update .. I am getting the debug messages from ioctl ... by mistake
> I placed the debugging messages in FBIOGET_CON2FBMAP.
> so if ioctl is executing, on pressing alt+ctrl+F2 the console should
> display on the second monitor (if i am wrong), but nothing is showing
> on that.
>
> sudip
>
>
> On Fri, Dec 12, 2014 at 1:38 PM, Sudip Mukherjee
> <sudipm.mukherjee@gmail.com> wrote:
>> Hi,
>> I have started with a pci based vga card. after booting i can see the
>> card in lspci , and after loading the driver as a module i can see
>> that the driver is linked with the device using lspci -k.
>>
>> for initial testing, i am using the ioctl command FBIOPUT_CON2FBMAP ,
>> which is supposed to map a console to a particular framebuffer. But on
>> switching to that console I am not getting anything in the monitor. To
>> test if ioctl is getting executed, i inserted some debugging messages
>> as pr_err() in that particular case of the ioctl function in
>> drivers/video/fbdev/core/fbmem.c , but after calling the ioctl again i
>> am not getting those debug messages in dmesg.
>> Now i am in doubt about what is happening.. if ioctl is executed then
>> my debug messages should have been printed.
>>
>> Can anyone please give me some hints about how to test this new vga
>> card... and also why the debug messages from ioctl is not getting
>> printed ..
>>
>> i think its almost a similar thing as https://lkml.org/lkml/2009/12/2/288
>>
>>
>> thanks
>> sudip