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Bug#822575: linux-4.1: UEFI root-fb vs. cirrusfb



On Tue, 2016-11-15 at 17:10 +0100, Philipp Hahn wrote:
> Hello David,
> 
> Am 15.11.2016 um 15:57 schrieb David Herrmann:
> > > > On Fri, Oct 28, 2016 at 2:24 PM, Philipp Hahn <hahn@univention.de> wrote:
> > > while experimenting with UEFI and secure-boot I stumbled into the issue
> > > "cirrusdrmfb broken with simplefb" associated with your name:
> > > <https://groups.google.com/forum/#!msg/linux.kernel/tD2UEqra-wU/u6NkZY8o5YEJ>
> > > 
> > > I'm using a Debian based linux-4.1.38 kernel, which has
> > > > # zgrep -E 'CONFIG_X86_SYSFB|CONFIG_FB_SIMPLE' /boot/config-`uname -r`
> > > > CONFIG_X86_SYSFB=y
> > > > CONFIG_FB_SIMPLE=y
> > > 
> > > I found that SUSE bug
> > > > > > <https://bugzilla.novell.com/show_bug.cgi?id=855821>, where Takashi Iwai
> > > finally disabled those options.
> > > 
> > > I also checked Debians latest linux-4.7 kernel in Debian-sid, which
> > > still has this setting. So my questions are:
> > > 1, should Debian disable those options for x86?
> > > 2. What would Debian loose?
> > > 3. or is that issue fixed otherwise in newer kernels?
> > 
> > Right now CONFIG_X86_SYSFB should remain disabled. Once the SimpleDRM
> > driver is upstream, there will be infrastructure to do the hw
> > handover. Right now, it breaks if you hand over hw from one driver to
> > another.
> 
> @David: Thank you for your feedback.
> 
> @Debian: Please disable CONFIG_X86_SYSFB in Debian for all next builds -
> maybe except arch=arm.

Thanks, I've committed this change for the next uploads to unstable and
stable.

Ben.

-- 
Ben Hutchings
Time is nature's way of making sure that everything doesn't happen at
once.

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