RE: Problems building rtw89

[Ping-Ke Shih <pkshih@realtek.com>]

// sort posting as expected (avoid top posting)

Iohann Tachy <iohann.tachy@gmail.com> wrote:
> > On Thu, Jan 29, 2026 at 9:36 PM Ping-Ke Shih <pkshih@realtek.com> wrote:
> > >
> > > Iohann Tachy <iohann.tachy@gmail.com> wrote:
> > > > Good morning,
> > > >
> > > > Currently there's an issue where it's not possible to build the rtw89 driver.
> > > > The RTL8852BE card has a compatibility problem with Intel X99 chipset
> > > > and a hacked rtw89 driver is needed to make it work.
> > > >
> > > > I kindly request to read the Github issue:
> > > > https://github.com/lwfinger/rtw89/issues/396
> > >
> > > A fix in Github is to disable 36-bit DMA [1]. I'd like to collect platform
> > > info to add a quirk. Please share outputs of below commands
> > >  - dmidecode
> > >  - lspci -vt
> > >  - lspci -x
> > >
> > > [1] https://github.com/a5a5aa555oo/rtw89-1/commit/629756ee0232089d298bb398790d4a745b950058
> > >
> > >
> On Fri, Jan 30, 2026 at 1:58 PM Iohann Tachy <iohann.tachy@gmail.com> wrote:
> >
> > Good afternoon!
> > I'll run the " - dmidecode
> >  - lspci -vt
> >  - lspci -x"
> > commands today evening.
> > and I'll let you know what's the output results.
> >
> > Regards,
> > Iohann
> >
> Good evening,
> 
> I attached the results of the commands you requested.
> 

I sent a patch to avoid 36-bit DMA as github did if the driver is running on
your motherboard X99. Please revert the patch you mentioned from github, and
apply this one to see if it can work to you.

I decide to not choose PCI bridge as a quirk rule, because the PCI bridge
"Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port"
is in common use, and I believe other boards using this bridge can work with
RTL8852BE.

Another, I assume you installed RTL8852BE on X99 personally, not pre-installed
on the board when you purchased, right?

[1] https://lore.kernel.org/linux-wireless/20260202014049.11783-1-pkshih@realtek.com/T/#u