[Bug 80331] [BISECTED]Radeon driver broken in kernel 3.12.15 onwards for ATI Radeon HD4770 Card

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https://bugzilla.kernel.org/show_bug.cgi?id=80331

--- Comment #11 from Colin <colin.bruce at ctalk.co.uk> ---
(In reply to Alex Deucher from comment #10)
> (In reply to Colin from comment #9)
> > but it was you that said it always failed to load so I am getting confused
> > now.
> > 
> > It is not to do with X  because the problem shows up in plain text mode as
> > well before X is ever loaded. With the patch installed it won't load any
> > fonts other than the default one when it is booting. With the patch removed
> > it will with no other changes.
> > 
> > If I undo the patch and make no other changes what so ever it works correctly
> > 
> > If I compile the driver as a module it with no other changes what so ever it
> > works correctly.
> > 
> > If I apply the patch and compile the kernel with the driver statically
> > linked but no other changes what so ever it works correctly.
> > 
> > I don't see how it can be my setup when the only change to make it work or
> > break is that patch.
> 
> I was referring to your setup.  All the patch does it move the firmware
> loading earlier in the driver init process.  So if the firmware loading
> fails with the patch applied, it should also fail without it asuming
> everything else is the same in your setup.  Something is wrong with your
> local configuration such that the firmware is not availabl at driver load in
> some cases.  The firmware is required to use acceleration in the driver.

I've built three versions of the same kernel 3.15.4. The first is the standard
kernel including the patch with the radeon driver built as a module. The second
is the kernel with the radeon driver statically linked and the third is also
statically linked but this time with that patch removed. I've booted from each
kernel and made copies of the output from dmesg, the output of setfont and the
Xorg log file. I've put the 9 files in a zip file and attached it. The names of
each file will tell you what they are.

I think your suggestion is correct. With the patch applied something is not
ready that prevents the firmware from being loaded. Without the patch or with
the driver loaded as a module the firmware loads every time. Loading as a
module will presumably mean that it tries to access the firmware file later in
the boot process.

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