>-----Original Message-----
>From: [email protected]
>[mailto:[email protected]] On Behalf Of Pavel Machek
>Sent: Thursday, October 21, 2004 4:23 PM
>To: Pallipadi, Venkatesh
>Cc: Kendall Bennett; [email protected];
>[email protected]; [email protected]
>Subject: Re: [Linux-fbdev-devel] Re: Generic VESA framebuffer
>driver and Video card BOOT?
>
>Hi!
>
>> >> I have done some experiments with this video post stuff.
>> >> I think this should be done using x86 emulator rather than doing
>> >> in real mode. The reason being, with an userlevel emulator
>> >we can call
>> >> it at different times during resume. The current real
>mode videopost
>> >> does
>> >
>> >Actually Ole Rohne has patch that allows you to call real mode any
>> >time you want.
>>
>> Yes. I tried Ole's patch. That helped on one of my laptops. But, on
>> the other one it doesn't work. It goes into real mode but
>never returns.
>> Both systems had Radeom 9000M cards, but one with older
>version of the
>> firmware (didn't work) and one with newer version.
>>
>> IIRC, even Stefan had similar problems with Ole's patch.
>
>It did not work for me, either, but I verified that it works as
>expected if I comment out actuall call of BIOS. So the problem is not
>with Ole's patch but with bios, and it may be the same if you emulate
>it...
>
>[Of course, it will not crash whole system when emulated, but system
>without video is not too good, either].
Even I thought so. But, with the emulator it doesn't hang. It brings
back my video. I double checked this using another vm86 emulator too.
No hang even there. I couldn't figure out why Ole's patch won't work
though. Right now I am using call_usermodehelper() to call the
emulator during resume and the video comes back just fine on this
system where Ole's patch didn't work.
Thanks,
Venki
Pallipadi, Venkatesh <[email protected]> wrote:
Hi,
> Even I thought so. But, with the emulator it doesn't hang. It brings
> back my video. I double checked this using another vm86 emulator too.
> No hang even there. I couldn't figure out why Ole's patch won't work
> though. Right now I am using call_usermodehelper() to call the
> emulator during resume and the video comes back just fine on this
> system where Ole's patch didn't work.
Is it possible to get this patch and code off you? I'd be interested in
testing this solution on various bits of hardware I've been working on.
Thanks,
--
Matthew Garrett | [email protected]
> Right now I am using call_usermodehelper() to call the
> emulator during resume and the video comes back just fine on this
> system where Ole's patch didn't work.
Can you explain me how you do this? call_usermodehelper() doesn't work for me
at resume time.
BTW, I had a look at the radeon card's resume code at 0xc000:3 and attempted
to implement it in a kernel module. The code is pretty simple, but it's quite
long. My module isn't finished, it only turns off the display and resets the
memory. I had to stop because I've a lot of things to do for school now.
Ole Rohne meant that the code is potentially dangerous because it pokes around
with undocumented PLL registers, so I will not send it to the list: I will
send it only to those who explicitly ask for it.
Stefan D?singer