[Mesa-dev] [Bug 98502] Delay when starting firefox, thunderbird or chromium and dmesg spam

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98502

--- Comment #20 from Alex Deucher <alexdeucher at gmail.com> ---
(In reply to Mauro Santos from comment #19)
> With 4.4.52 lspci says:  
> 03:00.0 Display controller [0380]: Advanced Micro Devices, Inc. [AMD/ATI]
> Mars [Radeon HD 8670A/8670M/8750M] [1002:6600] (rev ff)
> 
> With 4.9.11 lspci says:
> 03:00.0 Display controller [0380]: Advanced Micro Devices, Inc. [AMD/ATI]
> Mars [Radeon HD 8670A/8670M/8750M] [1002:6600] (rev 81)
> 
> Notice that the revision is different so I would bet the kernel was not
> behaving properly before.

Previously lspci would just read back from pci config space for stuff that was
not cached which resulted in reading back all ones if the device was powered
off, hence the rev ff.  The pci revision id is now cached so it's no longer
read back from pci config space which is why is shows the proper value (rev
81).

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