Thank David!
my mail provider blocks your reply without informing me, so i can't
receive it on time, i get your reply by some other way
it's amazing that you get my history of getting help here,
actually i've just bought 2nd-hand pc, it's core2 Q8200, 2.33G, it's my
fastest pc though others might think it's slow. and i'm interested in
its performance. my motive behind this purchase is to solve slow
reading PDF
as to firmware complaint, i think problem is with debian, not with me,
because other major distro (opensuse and fedora) include non-free
firmware in their official release. but i won't switch to other distro
for such small incontinence
