[Bug 107585] Wrong max TMDS clock rate on ThinkPad W541 mini-DisplayPort output

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107585

--- Comment #1 from Simon <Simon80 at gmail.com> ---
Wow! I made patches to implement the behaviour I described, but only after
doing so did I notice that the kernel sees a value of 0x0 in the HDMI max data
rate field. After digging a little deeper, I found this commit[1], which
probably explains the discrepancy, and closes the door on a fix involving the
VBT, at least for hardware equivalent to my system's configuration.

As a last-ditch attempt to be friendlier to users, I'd propose at least making
an educated guess about the maximum TMDS clockrate based on which generation of
Intel Graphics chipset is driving the port.

[1]
https://cgit.freedesktop.org/xorg/app/intel-gpu-tools/commit/?id=5a17ee2c8f9013f5db852d27564b837f9f2c5a9f

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