https://bugs.freedesktop.org/show_bug.cgi?id=87061

Xavier Bachelot <[email protected]> changed:

           What    |Removed                     |Added
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                 CC|                            |[email protected]

--- Comment #5 from Xavier Bachelot <[email protected]> ---
I think what happens is the following : the initial resolution is set to
1600x1200@75Hz, which exceed the memory bandwidth limit. When xrandr set the
resolution, it set the mode to 1600x1200 @60Hz, which does not exceed the
bandwidth.

The 1600x1200@75 mode is validated in iga1_crtc_mode_fixup by
ViaFirstCRTCModeValid, but then rejected by the later bandwidth check. One
would expect it then fallback to the next available mode in the EDID, that is
1600x1200@60, but it seems that doesn't happen. I'll try to dig more to
understand what happens, but I'm stuck for now.

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