[iPAQ] UPDATE, kernel bug - Re: strange display/framebuffer behaviour

this problem is kernel related (and is visible in X too):

2.4.7-rmk3-np1-devfs is OK
2.4.16-rmk1-hh6 is buggy

On Sun, 6 Jan 2002, Jiri Svoboda (lists) wrote:

>
> hi all,
>
> i'm working on port of some application. for some reasons i decided to
> make direct framebuffer port and not X port. during framebuffer
> programming i have had very strange problem. after some investigation i
> discovered this:
>
> (upper left corner of framebuffer is lower left corner of display if iPAQ
> is in normal portrait orientation)
>
> - most left column is NEVER visible
> - second column is visible as first
> - last column (320) is repeated two times on the end of display
> (if you don't understand - my english is horrible - just look bellow for
> test and examples)
>
> i want to know, if this is normal iPAQ behaviour or if this is just
> hardware problem of my piece (i think, this is probably HW problem and not
> framebuffer driver problem).
>
>
>
> i attached three test pictures (sorry for attachment, but gzipped is 2kB
> only), then you can easy test it too.
>
> just cat file to /dev/fb/0
>
>
> a) cat column_1 >/dev/fb/0
> - should display black screen with white line in the most left column
> - i see nothing on my machine, just black screen
>
>
> b) cat column_2 >/dev/fb/0
> - should display black screen with white line in second column
> - i finaly see white line in first column
>
>
> c) cat column_320 >/dev/fb/0
> - should display black screen with white line in last (320) column
> - i see "doubled" white line in columns 319 and 320
>
>
> please, test it and answer me, thanx :-)
>
> ugh, my machine is H3660, kernel 2.4.16-rmk1-hh6
>
>
> - JirkaS
>
>
Received on Mon Jan 7 10:32:19 2002